JP2001309315A - Device and method for converting image signal and image display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically make the quality of an image adaptable to an image display device by an output image signal. SOLUTION: An image signal converting part 110 converts an SD signal (525i) into a HD signal (525p, etc.), and the HD signal is supplied to the image display device 111 and subjected to image display. The CPU 301 of a system controller 101 receives identification information showing a device type such as a CRT display and a liquid crystal display from the device 111, reads image quality information X corresponding to the identification information from a ROM 302 and supplies the information X as a control signal CTL to the converting part 110. The converting part 110 obtains the pixel data of the HD signal with an estimated equation by using coefficient data corresponding to the information X. Thus, the quality of the image by the HD signal obtained by the part 111 is automatically made adaptable to the device 111, and a user does not need to perform adjustment such as contrast and sharpness by a different method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an image signal conversion device, an image signal conversion method, and an image display device using the same, which are preferably applied when converting a video signal of a system into a high-definition video signal. More specifically, when converting the first image signal into the second image signal, the pixel data of the pixel of interest relating to the second image signal is converted to the image quality acquired corresponding to the identification information indicating the type of the display device. The present invention relates to an image signal conversion device and the like in which an image quality based on an output image signal (second image signal) is automatically adapted to a display device by generating based on information.

[0002]

2. Description of the Related Art In recent years, with the increase in audio-visual orientation, it has been desired to develop a television receiver capable of obtaining a higher-resolution image. In response to this demand, a so-called Hi-Vision has been developed. The number of scanning lines for Hi-Vision is 1125, which is more than double that of 525 for the NTSC system. In addition, the aspect ratio of Hi-Vision is 9:16, while the aspect ratio of NTSC is 3: 4. For this reason, high-definition images can be displayed with higher resolution and a sense of realism as compared with the NTSC system.

[0003] Hi-Vision has such excellent characteristics, but it is impossible to display an image by the Hi-Vision system even if the video signal of the NTSC system is supplied as it is. This is because the standards differ between the NTSC system and Hi-Vision as described above.

Therefore, in order to display an image corresponding to an NTSC system video signal in a high-vision system, the present applicant has previously proposed a conversion device for converting an NTSC system video signal into a high-vision video signal. (See Japanese Patent Application No. 6-205934). In this converter, NT
From the SC video signal, extract pixel data of a block (region) corresponding to a target pixel related to a Hi-Vision video signal, determine the class of the target pixel based on a level distribution pattern of the pixel data of this block, The pixel data of the target pixel is generated corresponding to this class.

[0005]

As a display device for displaying an image based on a high-definition video signal obtained by the above-described converter, a CRT (cathode-ray tube) display, a liquid crystal display, a plasma display, a projector, or the like is used. You. In the above-described converter, the image quality of an image based on a high-definition video signal is fixed, and it is not possible to obtain an image quality suitable for an image display device to be used. Therefore, the user needs to separately adjust contrast, sharpness, and the like so that an image quality suitable for the image display device can be obtained by, for example, an image quality adjustment function provided in the image display device.

In view of the above, the present invention provides an image signal conversion device or the like which automatically adjusts the image quality of an image based on an output image signal to an image display device and does not require the user to adjust contrast, sharpness, and the like. With the goal.

[0007]

An image signal conversion apparatus according to the present invention is an image signal conversion apparatus for converting a first image signal comprising a plurality of pixel data into a second image signal comprising a plurality of pixel data. , From the first image signal, the second
A plurality of first pixels located around the pixel of interest related to the image signal
A first data selection unit for selecting the pixel data of the first pixel data, a class detection unit for detecting a class to which the pixel of interest belongs based on the plurality of first pixel data selected by the first data selection unit, An information input unit for inputting display device information including first identification information indicating a type of an image display device, and an image quality corresponding to the first identification information included in the display device information input to the information input unit Image quality information acquiring means for acquiring information, and pixel data generating means for producing pixel data of a pixel of interest corresponding to the class detected by the class detecting means and the image quality information acquired by the image quality information acquiring means. It is.

For example, the pixel data generating means has a memory for storing coefficient data of an estimation formula generated in advance for each combination of the class detected by the class detecting means and the image quality information obtained by the image quality information obtaining means. A coefficient data generating means for generating coefficient data corresponding to the class detected by the class detecting means and the image quality information acquired by the image quality information acquiring means; and a pixel of interest according to the second image signal from the first image signal. Data selecting means for selecting a plurality of second pixel data located in the vicinity of the pixel data, coefficient data generated by the coefficient data generating means, and a plurality of second pixels selected by the second data selecting means. And calculating means for calculating pixel data of the target pixel from the data by using an estimation formula.

The image signal conversion method according to the present invention is the image signal conversion method for converting a first image signal composed of a plurality of pixel data into a second image signal composed of a plurality of pixel data. A step of selecting, from the image signal, a plurality of first pixel data located around the pixel of interest relating to the second image signal; and a class to which the pixel of interest belongs based on the selected plurality of first pixel data. Detecting, and inputting display device information including at least first identification information indicating a type of the image display device; and a first display device information included in the input display device information.
Obtaining image quality information corresponding to the identification information of
Generating pixel data of the pixel of interest in accordance with the detected class and the acquired image quality information.

The image display device according to the present invention has an image signal input section for inputting a first image signal composed of a plurality of pixel data, and a first image signal input from the image signal input section.
An image signal conversion unit that converts the image signal of the second image signal into a second image signal composed of a plurality of pixel data and outputs the second image signal; It has. The image display device stores the display device information including at least the first identification information indicating the type of the image display device, and the display device information stored in the storage unit to the image signal conversion unit. Information transmitting means for transmitting, wherein the image signal conversion unit selects, from the first image signal, a plurality of first pixel data located around the pixel of interest relating to the second image signal; Selecting means, and a plurality of first data selected by the first data selecting means.
Class detecting means for detecting the class to which the pixel of interest belongs, information receiving means for receiving display device information sent from the image display device, and display device information received by the information receiving means. Image quality information acquiring means for acquiring the image quality information corresponding to the first identification information included in the image information, and the class detected by the class detecting means and the image quality information acquired by the image quality information acquiring means.
Pixel data generating means for generating pixel data of the target pixel.

In the present invention, from the first image signal,
A plurality of first pixel data located around the target pixel related to the second image signal is selected, and a class to which the target pixel belongs is detected based on the plurality of first pixel data.

Also, a first type indicating the type of the image display device is provided.
Image quality information corresponding to the identification information is obtained. For example,
There is provided a storage unit for storing the correspondence between the first identification information and the image quality information in advance, and the image quality information is acquired by referring to the correspondence stored in the storage unit.

Then, pixel data of the target pixel is generated in accordance with the obtained image quality information and the detected class. For example, coefficient data of an estimation formula generated in advance for each combination of class and image quality information is stored in a memory, and from this memory, the obtained image quality information and coefficient data corresponding to the detected class are read out. In addition, a plurality of second pixel data located around the target pixel related to the second image signal is selected from the first image signal, and the pixel data of the target pixel is calculated by the estimation formula.

As described above, when converting the first image signal into the second image signal, the pixel data of the pixel of interest relating to the second image signal includes the first data indicating the type of the image display device.
Is generated based on the image quality information acquired corresponding to the identification information. Therefore, the output image signal (second image signal)
The image quality is automatically adapted to the image display device, and the user does not need to adjust contrast, sharpness, and the like.

When the second image signal is supplied to an image display device having an image quality adjusting function such as contrast and sharpness to display an image based on the second image signal, the image quality adjusting function is invalidated. This can prevent the image quality of the second image signal from deteriorating due to the image quality adjustment of the image display device, and can maximize the performance of the image signal conversion unit.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a television receiver 100 as an embodiment.

The television receiver 100 obtains a 525i signal as an SD (Standard Definition) signal from a broadcast signal, and converts the 525i signal into an HD (High Definition) signal.
The signal is converted into a 525p signal or a 1050i signal as a signal, and an image based on the 525p signal or the 1050i signal is displayed.

Here, the 525i signal has 52 lines.
Five lines mean an interlaced image signal, and 525p
The signal means a progressive image signal (same as the non-interlace method) with 525 lines, and the 1050i signal means an interlace image signal with 1050 lines.

The tele-receiver 100 includes a microcomputer, and includes a system controller 101 for controlling the operation of the entire system and a remote control signal receiving circuit 102 for receiving a remote control signal.
The remote control signal receiving circuit 102 is connected to the system controller 101 and outputs a remote control signal RM output from the remote control transmitter 200 in response to a user operation.
Is received, and an operation signal corresponding to the signal RM is supplied to the system controller 101.

The system controller 101 has a CPU
ROM (read only memory) 30 in which a correspondence relationship between (Central Processing Unit) 301, first identification information indicating the type of image display device, and image quality information X is stored.
2 and a bus controller 303 for performing communication with the image display device 111. ROM30
2 and the bus controller 303 are connected to the CPU 301.

The television receiver 100 is supplied with a receiving antenna 105 and a broadcast signal (RF modulated signal) captured by the receiving antenna 105, and performs channel selection processing, intermediate frequency amplification processing, detection processing, and the like. SD signal Va (525
i signal) and an external SD signal V
b (525i signal).

The television receiver 100 is adapted to output the SD signal V
a switch 1 for selectively outputting either a or Vb
08, and a buffer memory 109 for temporarily storing the SD signal output from the changeover switch 108. SD signal V output from tuner 106
a is supplied to the fixed terminal on the a side of the changeover switch 108,
The SD signal Vb input from the external input terminal 107 is supplied to a fixed terminal on the b side of the changeover switch 108. The switching operation of the changeover switch 108 is controlled by the system controller 101.

The television receiver 100 includes an image signal converter 110 for converting an SD signal (525i signal) temporarily stored in the buffer memory 109 into an HD signal (525p signal or 1050i signal), An image display device 111 that displays an image based on the HD signal output from the signal conversion unit 110 is provided.

As the image display device 111, a CRT
A display, a liquid crystal display, a plasma display, a projector and the like are used. Image display device 1
11 is a CPU 4 for controlling the operation of the entire device.
01 and an operation unit 4 for the user to perform an image quality adjustment operation and the like
02, first identification information indicating the type of the image display device 111, second identification information indicating that there is an image quality adjustment function, and whether the HD signal to be input to the image display device 111 is a 525p signal or a 1050i signal A ROM 403 in which display device information including third identification information indicating whether the image data is stored is stored in advance, and a bus controller 404 for performing communication with the image signal conversion unit 110. The operation unit 402, the ROM 403, and the bus controller 404 are connected to the CPU 401.

The image display device 111 includes a video signal input terminal 405, an image quality adjustment unit 406 for performing image quality adjustment processing such as contrast and sharpness on the video signal input to the input terminal 405, and an input terminal 40.
A changeover switch 407 for selectively outputting the video signal input to 5 or the video signal subjected to the image quality adjustment processing by the image quality adjustment section 406, and processing the video signal output from the changeover switch 407 to display section 409. And a display processing unit 408 for displaying an image. The video signal input to the input terminal 405 is supplied to the fixed terminal on the a side of the changeover switch 407, and the video signal subjected to the image quality adjustment processing by the image quality adjustment
Supplied to the fixed terminal on the side. The switching operation of the changeover switch 407 is controlled by the CPU 401.

The input terminal 4 of the image display device 111
05 is connected to the image signal converter 110 by the signal line 501.
, The image display device 111 is connected to the image signal conversion unit 110. In addition,
At the same time, the bus controller 404 of the image display device 111 is connected to the bus controller 303 of the system controller 101 by a bus signal line 502 composed of, for example, an IEEE 1394 bus.

The operation of the television receiver 100 shown in FIG. 1 will be described. The image display device 11
1 is connected, that is, the system controller 10
The image display device 111 is connected to the first bus controller 303.
When the bus controller 404 is connected, the CPU 301 of the system controller 101 recognizes the connection and performs the control operation shown in the flowchart of FIG.

First, in step ST1, a command for requesting transmission of display device information is transmitted to the image display device 11.
Send to 1. In this case, the CPU 301 generates a command requesting transmission of display device information and supplies the command to the bus controller 303. The bus controller 303 transmits the command to the bus controller 404 of the image display device 111 via the bus signal line 502.

When the bus controller 404 of the image display device 111 receives the command, it
Supply to U401. Then, the CPU 401 has a ROM
The display device information is read from 403 and supplied to the bus controller 404. The bus controller 404 transmits the display device information to the bus controller 303 of the system controller 101 via the bus signal line 502. When receiving the display device information, the bus controller 303 supplies the display device information to the CPU 301.

Returning to FIG. 2, next, in step ST2,
It is determined whether display device information has been received from the image display device 111. When the display device information is received, in step ST3, the image quality information X stored in the ROM 302 as a pair with the first identification information (identification information indicating the type of the image display device 111) included in the display device information. Is read and obtained.

Then, in step ST4, the third identification information (image display device 11) included in the display device information is displayed.
Whether the HD signal to be input to 1 is a 525p signal or 105
The identification information indicating whether the signal is a 0i signal) and the image quality information acquired as described above are supplied to the image signal conversion unit 110 as the control signal CTL.

Next, in step ST5, it is determined whether or not the display device information includes second identification information (identification information indicating that there is an image quality adjustment function). If there is no second identification information, the process is immediately terminated. If there is the second identification information, a command for disabling the image quality adjustment function is transmitted to the image display device 111 in step ST6. In this case, the CPU 301 generates a command for disabling the image quality adjustment function and supplies it to the bus controller 303. The bus controller 303 transmits the command to the bus controller 404 of the image display device 111 via the bus signal line 502.

When the bus controller 404 of the image display device 111 receives the command, it
Supply to U401. Then, the CPU 401 controls the changeover switch 407 to switch to the a side. Thus, the video signal output from the changeover switch 407 is
This is the same as that input to the input terminal 405, and the image quality adjustment in the image quality adjustment unit 406 is substantially invalidated.

The changeover switch 407 is connected to the CPU 40
Before 1 receives a command for disabling the image quality adjustment function, it is switched to the b side. When the connection of the image display device 111 to the image signal converter 110 is released with the switch 407 switched to the a side, the switch 407 is switched back to the b side.

When an image display corresponding to the SD signal Va output from the tuner 106 is instructed by the user's operation of the remote control transmitter 200, the changeover switch 108 is connected to the a side under the control of the system controller 101. The changeover switch 108 outputs the SD signal Va. On the other hand, when an image display corresponding to the SD signal Vb input to the external input terminal 107 is instructed by the user's operation of the remote control transmitter 200, the changeover switch 108 is connected to the b side under the control of the system controller 101, The changeover switch 108 outputs the SD signal Vb.

The SD signal (525i signal) output from the changeover switch 108 is stored in the buffer memory 109 and temporarily stored. And this buffer memory 1
09 is temporarily stored in the image signal conversion unit 1.
10 and the HD signal (525p signal or 105
0i signal). That is, the image signal conversion unit 1
In FIG. 10, the pixel data (hereinafter referred to as “S
D pixel data "), pixel data constituting the HD signal (hereinafter, referred to as" HD pixel data ") is obtained.

Here, the selection of the 525p signal or the 1050i signal is made by the CPU 30 of the system controller 101.
1 is performed based on the third identification information supplied as the control signal CTL as described above. The HD signal output from the output terminal 127 of the image signal conversion unit 110 is input to the input terminal 405 of the image display device 111 via the signal line 501.

In the image display device 111, the HD signal input to the input terminal 405 is supplied to the display processing unit 408 via the a side of the changeover switch 407.
Processing for image display is performed. Thereby, the display unit 4
At 09, an image based on the HD signal input to the input terminal 405 is displayed.

As described above, the image signal conversion unit 110
When obtaining HD pixel data from SD pixel data, HD pixel data is calculated by an estimation formula, as described later.
As described above, coefficient data corresponding to the image quality information and the third identification information supplied as the control signal CTL are selectively used as the coefficient data of the estimation formula. This allows
The image quality of the image based on the HD signal output from the image signal conversion unit 110 automatically corresponds to the image display device 111.
It is not necessary to separately adjust contrast, sharpness, and the like.

In this case, in the image display device 111, the changeover switch 407 is connected to the a side, and the HD signal input to the input terminal 405 is supplied to the display processing unit 408 as it is for use. This prevents the image quality of the image due to the HD signal from being degraded by performing the image quality adjustment processing on the HD signal, thereby maximizing the performance of the image signal conversion unit 110.

Next, referring to FIG.
10 will be described in detail. This image signal conversion unit 110
S stored in the buffer memory 109 (see FIG. 1)
First to third tap selection circuits 121 for selectively extracting data of a plurality of SD pixels located around a target pixel related to an HD signal (1050i signal or 525p signal) from a D signal (525i signal) and outputting the data. To 123.

The first tap selection circuit 121 selectively extracts data of SD pixels (referred to as "prediction taps") used for prediction. Second tap selection circuit 1
Reference numeral 22 is for selectively extracting data of SD pixels (referred to as “space class taps”) used for class classification corresponding to the level distribution pattern of the SD pixel data. The third tap selection circuit 123 selectively extracts data of SD pixels (referred to as “motion class taps”) used for class classification corresponding to motion. When a space class is determined using SD pixel data belonging to a plurality of fields, the space class also includes motion information.

FIG. 4 shows the pixel positional relationship between the 525i signal and the 525p signal in an odd (o) field of a certain frame (F). Large dots are pixels of the 525i signal, and small dots are pixels of the 525p signal to be output. In the even (e) field, the line of the 525i signal is spatially shifted by 0.5 line. As can be seen from FIG. 4, the pixel data of the 525p signal includes line data L at the same position as the line of the 525i signal.
1 and line data L2 at an intermediate position between the upper and lower lines of the 525i signal. The number of pixels in each line of the 525p signal is twice the number of pixels in each line of the 525i signal.

FIG. 5 shows the pixel position relationship of a certain frame (F) with the 525i signal and the 1050i signal. The pixel position of the odd (o) field is indicated by a solid line, and the pixel position of the even (e) field is indicated by a solid line. This is indicated by a broken line. A large dot is a pixel of the 525i signal, and a small dot is a pixel of the 1050i signal to be output. As can be seen from FIG. 5, the pixel data of the 1050i signal is 5
Line data L1, L at positions near the line of the 25i signal
1 'and line data L2, L2' located far from the line of the 525i signal. Here, L1 and L2 are line data of odd fields, and L1 'and L2' are line data of even fields. The number of pixels in each line of the 1050i signal is twice as many as the number of pixels in each line of the 525i signal.

FIG. 6 and FIG.
When converting to a 5p signal, the first tap selection circuit 12
1 shows a specific example of a prediction tap (SD pixel) selected at 1. FIGS. 6 and 7 show vertical pixel positional relationships in odd (o) and even (e) fields of temporally continuous frames F-1, F, and F + 1.

As shown in FIG. 6, the prediction taps for predicting the line data L1 and L2 of the field F / o are:
The SD which is included in the next field F / e and spatially adjacent to the pixel of the 525p signal to be created (pixel of interest)
Pixels T1, T2, T3 and included in field F / o,
SD pixels T4, T5, T6 spatially adjacent to the 525p signal pixel to be created, and the previous field F-1
/ E, the SD pixels T7, T8, T9 spatially adjacent to the pixel of the 525p signal to be created, and the pixels of the 525p signal to be created, included in the preceding F-1 / o. Is an SD pixel T10 at a spatially neighboring position with respect to.

As shown in FIG. 7, the prediction taps for predicting the line data L1 and L2 of the field F / e are:
525p to be created, included in the next field F + 1 / o
SD pixel T1, spatially adjacent to the pixel of the signal
T2, T3, and SD pixels T4, T5, and T6 that are included in the field F / e and spatially adjacent to the pixel of the 525p signal to be created, and are included in the previous field F / o and created. The SD pixels T7, T8, T9 spatially adjacent to the pixel of the power 525p signal and the F-1
/ E, which is an SD pixel T10 spatially adjacent to the pixel of the 525p signal to be created.

When the line data L1 is predicted, the SD pixel T9 is not selected as a prediction tap.
On the other hand, when predicting the line data L2, the SD pixel T4 may not be selected as the prediction tap.

FIG. 8 and FIG.
When converting to a 50i signal, the first tap selection circuit 1
21 shows a specific example of a prediction tap (SD pixel) selected at 21. FIG. 8 and FIG. 9 show vertical pixel positional relationships of odd (o) and even (e) fields of temporally continuous frames F-1, F, and F + 1.

As shown in FIG. 8, the prediction taps for predicting the line data L1 and L2 of the field F / o are:
1050i included in the next field F / e and to be created
S spatially adjacent to the pixel of the signal (pixel of interest)
D pixels T1 and T2, SD pixels T3, T4, T5, and T6 included in the field F / o and spatially adjacent to the pixel of the 525p signal to be created;
These are SD pixels T7 and T8 that are included in -1 / e and spatially adjacent to the pixel of the 1050i signal to be created.

As shown in FIG. 9, the prediction tap for predicting the line data L1 'and L2' of the field F / e is included in the next field F + 1 / o and should be created.
The SD pixels T1 and T2 spatially adjacent to the pixel of the 50ip signal and the S pixels S10 included in the field F / e and spatially adjacent to the pixel of the 1050i signal to be created.
D pixels T3, T4, T5, T6 and the previous field F /
The SD pixels T7 and T8 included in o and spatially adjacent to the pixel of the 525p signal to be created.

When predicting the line data L1 and L1 ', the SD pixel T6 is not selected as a prediction tap. On the other hand, when predicting the line data L2 and L2', the SD pixel T3 is selected as a prediction tap. It may not be done.

Further, as shown in FIGS. 6 to 9, one or a plurality of SD pixels in the horizontal direction may be selected as prediction taps in addition to SD pixels at the same position in a plurality of fields.

FIGS. 10 and 11 show specific examples of space class taps (SD pixels) selected by the second tap selection circuit 122 when converting a 525i signal to a 525p signal. FIG. 10 and FIG. 11 show the vertical pixel positions of the odd (o) and even (e) fields of temporally continuous frames F-1, F and F + 1.

As shown in FIG. 10, the space class tap for predicting the line data L1 and L2 of the field F / o is included in the next field F / e and should be created.
The SD pixels T1 and T2 which are spatially close to the pixel of the 25p signal (pixel of interest) and the SD pixels which are included in the field F / o and are spatially close to the pixel of the 525p signal to be created T3, T4, and T5, and SD pixels T6 and T7 included in the previous field F-1 / e and spatially adjacent to the pixel of the 525p signal to be created.

As shown in FIG. 11, the space class taps for predicting the line data L1 and L2 of the field F / e are included in the next field F + 1 / o and correspond to the pixels of the 525p signal to be created. On the other hand, the SD pixels T1 and T2 spatially adjacent to each other and the SD pixels spatially adjacent to the pixel of the 525p signal included in the field F / e to be created.
Pixels T3, T4, T5, T6 and the previous field F / o
, And are SD pixels T6 and T7 spatially adjacent to the pixel of the 525p signal to be created.

It should be noted that the SD pixel T7 is not selected as a space class tap when predicting the line data L1, while the SD pixel T6 is not selected as a space class tap when predicting the line data L2. Is also good.

FIGS. 12 and 13 show specific examples of space class taps (SD pixels) selected by the second tap selection circuit 122 when converting a 525i signal to a 1050i signal. FIGS. 12 and 13 show vertical pixel positional relationships of odd (o) and even (e) fields of temporally continuous frames F-1, F and F + 1.

As shown in FIG. 12, the space class tap for predicting the line data L1 and L2 of the field F / o is included in the field F / o and should be created 105
The SD pixels T1, T2, T3 spatially adjacent to the pixel of the 0i signal (pixel of interest) and the previous field F-1 /
e, SD pixels T4, T5, T6, and T7 spatially adjacent to the pixel of the 1050i signal to be created.

As shown in FIG. 13, the space class tap for predicting the line data L1 'and L2' of the field F / e is included in the field F / e and must be created.
SD pixels T1, T2 and T3 spatially adjacent to the pixel of the 050i signal and SD pixels included in the previous field F / o and spatially adjacent to the pixel of the 1050i signal to be created T4, T5, T6, and T7.

It should be noted that the SD pixel T7 is not selected as a space class tap when predicting the line data L1 and L1 ', while the SD pixel T4 is used as a space class tap when predicting the line data L2 and L2'. May not be selected.

Further, as shown in FIGS. 10 to 13, one or a plurality of SD pixels in the horizontal direction may be selected as space class taps in addition to SD pixels at the same position in a plurality of fields.

FIG. 14 shows a specific example of a motion class tap (SD pixel) selected by the third tap selection circuit 123 when converting a 525i signal to a 525p signal. FIG. 14 shows a vertical pixel positional relationship between odd-numbered (o) and even-numbered (e) fields of temporally continuous frames F-1 and F. As shown in FIG. 14, the motion class tap for predicting the line data L1 and L2 of the field F / o is included in the next field F / e and corresponds to the pixel of the 525p signal to be created (pixel of interest). SD pixels n2, n4, and n6 spatially adjacent to each other, and SD pixels n1, n3, and n5 spatially adjacent to the pixel of the 525p signal to be created and included in the field F / o.
525p to be created, included in the previous field F-1 / e
SD pixel m2, spatially adjacent to the pixel of the signal
m4, m6, and SD pixels m1, m3, and m5 included in the previous field F-1 / o and spatially adjacent to the pixel of the 525p signal to be created. SD pixel n
The vertical position of each of 1 to n6 is the SD pixel m1
The vertical positions of m6 coincide with each other.

FIG. 15 shows a specific example of a motion class tap (SD pixel) selected by the third tap selection circuit 123 when converting a 525i signal to a 1050i signal. FIG. 15 shows frames F-1, F that are continuous in time.
Of the odd (o) and even (e) fields of FIG. As shown in FIG. 15, the motion class tap for predicting the line data L1 and L2 of the field F / o is included in the next field F / e.
The SD pixels n2, n4, and n6 spatially adjacent to the pixel of the 1050i signal to be created and the field F / o
And the SD pixels n1, n3, and n5 spatially adjacent to the pixel of the 1050i signal to be created and the pixels of the 1050i signal to be created included in the previous field F-1 / e. And the spatially neighboring SD pixels m2 and m
4, m6 and included in the previous field F-1 / o,
The SD pixels m1, m3, and m5 are spatially close to the pixel of the 1050i signal to be created. SD pixel n1
To n6 in the vertical direction are SD pixels m1 to m6, respectively.
The respective vertical positions of m6 coincide.

Returning to FIG. 3, the image signal converting unit 11
0 indicates a level distribution pattern of space class tap data (SD pixel data) selectively extracted by the second tap selection circuit 122, detects a space class based on the level distribution pattern, and obtains class information. Is output.

In the space class detection circuit 124, for example,
An operation for compressing each SD pixel data from 8-bit data to 2-bit data is performed. Then, from the space class detection circuit 124, compressed data corresponding to each SD pixel data is output as space class information. In the present embodiment, ADRC (Adaptive Dyn
Data compression is performed by amic range coding. As information compression means, other than ADRC, DP
CM (prediction coding), VQ (vector quantization), or the like may be used.

Originally, ADRC is a VTR (Video Tape R)
ecorder) is an adaptive requantization method developed for high-performance coding. However, since local patterns at the signal level can be efficiently expressed with a short word length, it is suitable for use in the data compression described above. Things. When using ADRC, the maximum value of the space class tap data (SD pixel data) is MAX, the minimum value is MIN, and the dynamic range of the space class tap data is DR (= MAX-MIN +
1) Assuming that the number of requantization bits is P, for each SD pixel data ki as data of a space class tap,
By the operation of the expression (1), a requantized code Qi as compressed data is obtained. However, in equation (1), []
Means truncation processing. When there are Na SD pixel data as space class tap data, i =
1 to Na. Qi = [(ki−MIN + 0.5). 2 ^P / DR] (1)

The image signal conversion unit 110 detects a motion class mainly representing the degree of motion from the data (SD pixel data) of the motion class tap selectively extracted by the third tap selection circuit 123. And a motion class detection circuit 125 for outputting the class information.

In the motion class detection circuit 125, the third
, A difference between frames is calculated from the motion class tap data (SD pixel data) mi and ni selectively extracted by the tap selection circuit 123, and threshold processing is performed on the average value of the absolute values of the differences. Then, a motion class, which is an index of the motion, is detected. That is, in the motion class detection circuit 125, the average value AV of the absolute value of the difference is calculated by Expression (2). Third tap selection circuit 123
Thus, for example, as described above, the 12 SD pixel data m1
When 〜m6, n1 to n6 are extracted, Nb in equation (2) is 6.

[0070]

(Equation 1)

Then, in the motion class detection circuit 125,
The average value AV calculated as described above is compared with one or a plurality of threshold values, and class information MV of the motion class is obtained.
Is obtained. For example, three thresholds th1, th2,
th3 (th1 <th2 <th3) is prepared, and when detecting four motion classes, MV when AV ≦ th1
= 0, th1 <AV ≦ th2, MV = 1, th2
MV = 2 when <AV ≦ th3, and MV = 3 when th3 <AV.

Further, the image signal converter 110 converts the requantization code Qi as the class information of the space class output from the space class detector 124 and the class information MV of the motion class output from the motion class detector 125. Based on the HD signal (525p signal or 105
It has a class synthesis circuit 126 for obtaining a class code CL indicating the class to which the pixel (signal of interest 0i) belongs.

In the class synthesizing circuit 126, the calculation of the class code CL is performed by the equation (3). In addition,
In Equation (3), Na indicates the number of data (SD pixel data) of the space class tap, and P indicates the number of requantization bits in ADRC.

[0074]

(Equation 2)

The image signal conversion section 110 has registers 130 to 133 and a coefficient memory 134.
The line-sequential conversion circuit 128 described later needs to switch its operation between outputting a 525p signal and outputting a 1050i signal. The register 130 stores operation specifying information for specifying the operation of the line sequential conversion circuit 128. The line-sequential conversion circuit 128 includes the register 1
The operation is performed according to the operation designation information supplied from 30.

The register 131 stores tap position information of the prediction tap selected by the first tap selection circuit 121. The first tap selection circuit 121 selects a prediction tap according to the tap position information supplied from the register 131. The tap position information is for, for example, numbering a plurality of SD pixels that may be selected and designating the number of the SD pixel to be selected. The same applies to the following tap position information.

The register 132 stores tap position information of the space class tap selected by the second tap selection circuit 122. Second tap selection circuit 122
Selects a space class tap according to the tap position information supplied from the register 132.

The register 132 stores tap position information A when the movement is relatively small and tap position information B when the movement is relatively large. Either of the tap position information A and B is assigned to the second tap selection circuit 12.
2 is selected by the motion class information MV output from the motion class detection circuit 125.

That is, when MV = 0 or MV = 1 because there is no motion or the motion is small, the tap position information A is supplied to the second tap selection circuit 122, and the second tap selection circuit 122 The space class tap selected by the circuit 122 extends over two fields as shown in FIGS. When MV = 2 or MV = 3 because the motion is relatively large, the tap position information B is supplied to the second tap selection circuit 122, and the space selected by the second tap selection circuit 122 is selected. Although not shown, the class tap is only an SD pixel in the same field as a pixel to be created.

The register 131 stores the tap position information when the movement is relatively small and the tap position information when the movement is relatively large.
May be selected based on the motion class information MV output from the motion class detection circuit 125.

The register 133 stores the tap position information of the motion class tap selected by the third tap selection circuit 123. Third tap selection circuit 123
Selects a motion class tap according to the tap position information supplied from the register 133.

Further, the coefficient memory 134 stores coefficient data of an estimation formula used in the estimation prediction operation circuit 127 described later for each class. The coefficient data is information for converting a 525i signal as an SD signal into a 525p signal or a 1050i signal as an HD signal. The class memory CL supplied from the class synthesizing circuit 126 is supplied as read address information to the coefficient memory 134, and coefficient data corresponding to the class code CL is read from the coefficient memory 134, and the estimated prediction operation circuit 127 Will be supplied.

The image signal conversion section 110 has an information memory bank 135. This information memory bank 1
In 35, operation designation information to be stored in the register 130, tap position information to be stored in the registers 131 to 133, and coefficient data to be stored in the coefficient memory 134 are stored in advance.

Here, as the operation designation information to be stored in the register 130, the information memory bank 135 includes first operation designation information for operating the line sequential conversion circuit 128 to output the 525p signal, Second operation designation information for operating the line-sequential conversion circuit 128 to output the 1050i signal is stored in advance. As described above, the information memory bank 135 receives the third information from the CPU 301 of the system controller 101 (see FIG. 1).
Identification information (HD to be input to the image display device 111)
Identification information indicating whether the signal is a 525p signal or a 1050i signal) is supplied as the control signal CTL. Then, the register 130 is read from the information memory bank 135.
Is loaded with the first operation specifying information or the second operation specifying information according to the third identification information.

The information memory bank 135 stores the first position corresponding to the first conversion method (525p) as the tap position information of the prediction tap to be stored in the register 131.
And second tap position information corresponding to the second conversion method (1050i) are stored in advance. The first tap position information or the second tap position information is loaded from the information memory bank 135 into the register 131 according to the above-described third identification information.

In the information memory bank 135, as the tap position information of the space class tap to be stored in the register 132, the first tap position information corresponding to the first conversion method (525p) and the second tap position information are stored. Conversion method (1050
The second tap position information corresponding to i) is stored in advance. Note that the first and second tap position information each include tap position information when the movement is relatively small and tap position information when the movement is relatively large. The first tap position information or the second tap position information is loaded from the information memory bank 135 into the register 132 according to the above-described third identification information.

The information memory bank 135 stores, as the tap position information of the motion class tap to be stored in the register 133, the first tap position information corresponding to the first conversion method (525p) and the second tap position information. Conversion method (1050
The second tap position information corresponding to i) is stored in advance. The register 13 is stored in the information memory bank 135.
3 is loaded with the first tap position information or the second tap position information according to the third identification information described above.

The information memory bank 135 stores first coefficient data as coefficient data to be stored in the coefficient memory 134.
In addition, coefficient data for each class in a plurality of image quality information X corresponding to each of the second conversion method is stored in advance. A method of generating coefficient data corresponding to the plurality of pieces of image quality information X will be described later.

The information memory bank 135 contains the CPU of the system controller 101 (see FIG. 1) as described above.
From 301, together with the third identification information, the image quality information X read from the ROM 302 corresponding to the first identification information is also supplied as the control signal CTL. From the information memory bank 135, coefficient data corresponding to the image quality information X and the third identification information is loaded into the coefficient memory 134.

Further, the image signal conversion section 110 includes prediction tap data (SD pixel data) xi selectively extracted by the first tap selection circuit 121 and a coefficient memory 134.
H to be created from the coefficient data wi read from
D signal pixel (target pixel) data (HD pixel data)
Is calculated.

In the estimation / prediction calculation circuit 127, 525
When outputting the p signal, as shown in FIG. 4 described above, the odd (o) field and the even (e) field
Line data L1 at the same position as the line of the 25i signal;
It is necessary to generate line data L2 at the intermediate position between the upper and lower lines of the 525i signal and to double the number of pixels in each line. Also, in this estimation operation circuit 127, 105
When outputting the 0i signal, as shown in FIG.
In the odd (o) and even (e) fields,
The line data L1 at a position close to the line of the 525i signal
It is necessary to generate L1 'and line data L2 and L2' located far from the line of the 525i signal, and to double the number of pixels in each line.

Therefore, in the estimation / prediction calculation circuit 127, H
Data of four pixels constituting the D signal are simultaneously generated. For example, the data of the four pixels are simultaneously generated using estimation equations having different coefficient data, and the coefficient memory 134 supplies coefficient data of each estimation equation. Here, in the estimation prediction operation circuit 127, the HD pixel data to be created is obtained from the prediction tap data (SD pixel data) xi and the coefficient data wi read from the coefficient memory 134 by the linear estimation expression of the expression (4). y is calculated. First tap selection circuit 121
When the number of prediction taps selected by is 10 as shown in FIGS. 6 and 7, n in the equation (4) is 10.

[0093]

(Equation 3)

The image signal conversion unit 110 performs line double speed processing for doubling the horizontal period, and outputs the line data L1, L2 (L
1 ', L2') in a line sequential conversion circuit 128
And an output terminal 129 for outputting the HD signal output from the line-sequential conversion circuit 128.

FIG. 16 shows a line double speed process in the case of outputting a 525p signal using an analog waveform. As described above, the line data L1 and L2 are generated by the estimation prediction operation circuit 127. Line data L
1 includes lines a1, a2, a3,... In order, and b1, b2, b3,.
・ Lines are included. The line-sequential conversion circuit 128 compresses the data of each line by に in the time axis direction and alternately selects the compressed data, thereby providing a line-sequential output a
0, b0, a1, b1,...

When outputting the 1050i signal, the line-sequential conversion circuit 128 generates a line-sequential output so as to satisfy the interlace relationship in the odd field and the even field. Therefore, the line sequential conversion circuit 128
It is necessary to switch the operation between the case of outputting a 525p signal and the case of outputting a 1050i signal.
The operation specifying information is supplied from the register 130 as described above.

Next, the operation of the image signal converter 110 will be described. From the SD signal (525i signal) stored in the buffer memory 109 (see FIG. 1), the data (SD pixel data) of the space class tap is selectively extracted by the second tap selection circuit 122. In this case, the second tap selection circuit 122 performs tapping based on the conversion method selected by the user supplied from the register 132 and tap position information corresponding to the motion class detected by the motion class detection circuit 125. Is selected.

The space class tap data (SD pixel data) selectively extracted by the second tap selection circuit 122 is supplied to a space class detection circuit 124. In this space class detection circuit 124, each SD pixel data as the data of the space class tap is subjected to ADRC processing, and is regenerated as class information of a space class (mainly a class classification for representing a waveform in space). The quantization code Qi is obtained (see equation (1)).

The third tap selection circuit 123 selectively extracts motion class tap data (SD pixel data) from the SD signal (525i signal) stored in the buffer memory 109. In this case, the third tap selection circuit 123 selects a tap based on tap position information supplied from the register 133 and corresponding to the conversion method selected by the user.

The data (SD pixel data) of the motion class tap selectively extracted by the third tap selection circuit 123 is supplied to the motion class detection circuit 125. The motion class detection circuit 125 obtains class information MV of a motion class (mainly a class classification for representing a degree of motion) from each SD pixel data as motion class tap data.

The motion information MV and the above-described requantized code Qi are supplied to the class synthesis circuit 126. The class synthesizing circuit 126 obtains a class code CL indicating the class to which the pixel (target pixel) of the HD signal (525p signal or 1050i signal) to be created belongs from the motion information MV and the requantized code Qi ( (See equation (3)). The class code CL is stored in the coefficient memory 13
4 is supplied as read address information.

The coefficient memory 134 stores predetermined image quality information X
The coefficient data for each class in the conversion method is loaded from the information memory bank 135 and stored. By supplying the class code CL as read address information as described above, the coefficient memory 134
The coefficient data wi corresponding to the class code CL is read out from, and is supplied to the estimation prediction operation circuit 127.

Further, based on the SD signal (525i signal) stored in the buffer memory 109, the first tap selection circuit 121 uses the prediction tap data (SD pixel data).
Are selectively taken out. In this case, the first tap selection circuit 121 selects a tap based on tap position information supplied from the register 131 and corresponding to the conversion method selected by the user. The prediction tap data (SD pixel data) xi selectively extracted by the first tap selection circuit 121 is calculated by the estimated prediction operation circuit 1
27.

In the estimation / prediction calculation circuit 127, the data (SD pixel data) xi of the prediction tap and the coefficient memory 134
H to be created from the coefficient data wi read from
D signal pixel (target pixel) data (HD pixel data)
y is calculated (see equation (4)). In this case, data of four pixels constituting the HD signal is simultaneously generated.

As a result, the first 525p signal is output.
Is selected, in the odd (o) field and the even (e) field, the line data L1 at the same position as the line of the 525i signal and the line data L2 at the middle position between the upper and lower lines of the 525i signal Is generated (see FIG. 4). When the second conversion method for outputting the 1050i signal is selected, the line data L1 and L1 'at positions close to the line of the 525i signal in the odd (o) field and the even (e) field, and 52
Line data L2 and L at positions far from the 5i signal line
2 'are generated (see FIG. 5).

The line data L 1 and L 2 (L 1 ′, L 2 ′) generated by the estimation / prediction calculation circuit 127 are supplied to the line-sequential conversion circuit 128. In the line sequential conversion circuit 128, the line data L1, L2 (L
1 ′, L2 ′) are line-sequentially generated to generate an HD signal. Then, the HD signal is output to the output terminal 129. In this case, the line-sequential conversion circuit 128
The operation is performed according to the operation instruction information corresponding to the third identification information supplied from 0. Therefore, when the HD signal to be input to the image display device 111 is a 525p signal, the line-sequential conversion circuit 128 outputs a 525p signal. On the other hand, when the HD signal to be input to the image display device 111 is a 1050i signal, the line-sequential conversion circuit 12
8 outputs a 1050i signal.

As described above, the image display device 111
The image quality information X corresponding to the first identification information indicating the type of the
And the coefficient memory 134 stores the information memory bank 1
From 35, coefficient data of each class corresponding to the image quality information X is loaded. Thereby, the image signal converter 110
The image quality of the image based on the output HD signal automatically adapts to the image display device 111, and the user does not need to adjust contrast, sharpness, and the like using the image display device 111.

As described above, the information memory bank 135
Stores coefficient data for each class at a plurality of resolutions. The coefficient data is generated in advance by learning.

First, the learning method will be described.
The coefficient data wi (i = 1 to 1) based on the estimation expression of the expression (4)
Here, an example is shown in which n) is obtained by the least square method. As a generalized example, X is input data, W is coefficient data,
Consider the observation equation (5) with Y as the predicted value. In the equation (5), m indicates the number of learning data, and n indicates the number of prediction taps.

[0110]

(Equation 4)

The least squares method is applied to the data collected by the observation equation (5). Based on the observation equation (5), the residual equation (6) is considered.

[0112]

(Equation 5)

From the residual equation of equation (6), it is considered that the most probable value of each wi is a case where the condition for minimizing e ² in equation (7) is satisfied. That is, the condition of equation (8) may be considered.

[0114]

(Equation 6)

That is, n conditions based on i in the equation (8) are considered, and w ₁ , w ₂ ,..., W _n satisfying the conditions may be calculated. Then, from the residual equation of equation (6), (9)
An expression is obtained. Further, from equations (9) and (5),
Equation (10) is obtained.

[0116]

(Equation 7)

Then, from equations (6) and (10),
The normal equation of the equation (11) is obtained.

[0118]

(Equation 8)

The normal equation of the equation (11) is the number of unknowns n
Since it is possible to make the same number of equations as
The most probable value of i can be obtained. In this case, the simultaneous equations are solved using a sweeping-out method (Guss-Jordan elimination method) or the like.

FIG. 17 shows a flow of learning the above-described coefficient data. In order to perform learning, an input signal and a teacher signal to be predicted are prepared.

First, in step ST31, a combination of target pixel data obtained from a teacher signal and n pixel data of prediction taps obtained from an input signal is generated as learning data. Next, in step ST32, it is determined whether or not the generation of the learning data has ended. If the generation of the learning data has not ended, in step ST33, the class to which the pixel data of interest in the learning data belongs is determined. The determination of the class is performed based on a predetermined number of pixel data obtained from the input signal corresponding to the target pixel data.

In step ST34, for each class, the learning data generated in step ST31, that is, the pixel data of interest and the n pixel data of the prediction taps, are used as shown in equation (11). Generate a normal equation. The operations in steps ST31 to ST34 are repeated until the generation of the learning data is completed, and a normal equation in which many learning data are registered is generated.

When the generation of the learning data is completed in step ST32, the normal equation generated for each class is solved in step ST35 to obtain n coefficient data wi for each class. Then, in step ST36, the coefficient data wi is registered in the memory divided into addresses by class, and the learning flow ends.

Next, the coefficient data wi for each class in the plurality of image quality information X stored in the information memory bank 135 in the image signal converter 110 of the television receiver 100 shown in FIG. The details of the coefficient data generation device 150 generated in advance according to the principle will be described. FIG.
Shows a configuration example of the coefficient data generation device 150.

The coefficient data generating device 150 outputs an HD signal (525p signal / 1050i signal) as a teacher signal.
And a two-dimensional thinning filter 152 that performs horizontal and vertical thinning filter processing on the HD signal to obtain an SD signal as an input signal.
And

A conversion method selection signal is supplied to the two-dimensional thinning filter 152 as a control signal. First conversion method (5 from the 525i signal by the image signal conversion unit 110 in FIG. 3)
When “obtain 25p signal” is selected, the two-dimensional decimation filter 152 performs a decimation process on the 525p signal to generate an SD signal (see FIG. 4). On the other hand, the second
(The 1050i signal is obtained from the 525i signal by the image signal conversion unit 110 in FIG. 3) is selected, the two-dimensional decimation filter 152 performs a thinning process on the 1050i signal to generate an SD signal. (See FIG. 5).

The two-dimensional thinning filter 152 includes
The image quality information X is supplied as a control signal. The image quality information X is synonymous with the image quality information X stored in the ROM 302 of the system controller 101 in the television receiver 100 shown in FIG. Two-dimensional thinning filter 152
In, the processing content is changed according to the value of the image quality information X, and the image quality of the generated SD signal is changed.

For example, the two-dimensional thinning filter 152 is configured using a Gaussian filter. In this case, HD
The pixel data in the vertical direction forming the signal is thinned out by the one-dimensional Gaussian filter expressed by the equation (12), and the pixel data in the horizontal direction making up the HD signal is similarly thinned out by the same one-dimensional Gaussian filter. Thus, an SD signal is generated. When the two-dimensional thinning filter 152 is configured using a Gaussian filter as described above, the value of the standard deviation σ is changed according to the value of the image quality information X.

[0129]

(Equation 9)

For example, σ = 0.5 for image quality information 1, σ = 1.2 for image quality information 2, σ = 1.6 for image quality information 3, and σ = 2.0 for image quality information 4. And
In the image quality information 5, σ = 2.4, and in the image quality information 6, σ = 2.4.
2.8, and σ = 3.0 in the image quality information 7. In this case, as the value of σ increases, the image signal conversion unit 11 in FIG.
Thus, coefficient data for increasing the resolution of the image by the HD signal generated at 0 is obtained.

In the above-described television receiver 100 of FIG. 1, the first identification information indicating the type sent from the image display device 111 to the system controller 101 is, for example, a CRT display, a liquid crystal display, a plasma display, or a projector. When showing,
The CPU 301 obtains the image quality information 4, the image quality information 3, the image quality information 5, and the image quality information 6 from the ROM 302, and the image signal converter 110 stores the count data generated according to the respective image quality information X in the information memory bank 134. It is loaded into the coefficient memory 134 and used.

For example, the relationship between the first identification information and the third identification information is that when the first identification information indicates a CRT display, the third identification information indicates that the HD signal to be input is 5 bits.
When the first identification information indicates a liquid crystal display, the third identification information indicates that the HD signal to be input is the 1050i signal or the 1050i signal.
Signal, and when the first identification information indicates a plasma display, the third identification information indicates that the HD signal to be input is a 525p signal, and the first identification signal Indicates the projector, the third
Is indicated to be a 525p signal.

FIG. 19 shows an example of the relationship between the type of the image display device, the tendency of the coefficient data, the standard deviation σ, and the type of the HD signal.

Returning to FIG. 18, the coefficient data generator 150 converts the SD signal (525i signal) output from the two-dimensional thinning filter 152 into an HD signal (1050 signal).
There are first to third tap selection circuits 153 to 155 for selectively extracting and outputting data of a plurality of SD pixels located around the target pixel related to the i signal or the 525p signal).

The first to third tap selection circuits 153
To 155 have the same configuration as the first to third tap selection circuits 121 to 123 of the image signal conversion unit 110 described above. These first to third tap selection circuits 153 to 155
Is selected by tap position information from the tap selection control unit 156.

The tap selection control circuit 156 is supplied with a conversion method selection signal as a control signal. Tap position information supplied to the first to third tap selection circuits 153 to 155 is different between a case where the first conversion method is selected and a case where the second conversion method is selected. . The tap selection control circuit 156 is supplied with the motion class information MV output from the motion class detection circuit 158 described later. Thereby, the tap position information supplied to the second tap selection circuit 154 is made different depending on whether the movement is large or small.

Further, the coefficient data generation device 150
, A level distribution pattern of the data (SD pixel data) of the space class taps selectively extracted by the tap selection circuit 154, a space class is detected based on this level distribution pattern, and the space class for outputting the class information is output. It has a detection circuit 157. The space class detection circuit 157 has the same configuration as the space class detection circuit 124 of the image signal conversion unit 110 described above. From this space class detection circuit 157, a requantization code Qi for each SD pixel data as space class tap data is output as class information indicating a space class.

Further, the coefficient data generation device 150
The motion class detection circuit 158 detects a motion class mainly representing the degree of motion from the data (SD pixel data) of the motion class taps selectively extracted by the tap selection circuit 155, and outputs the class information MV. have. The motion class detection circuit 158 has the same configuration as the motion class detection circuit 125 of the image signal conversion unit 110 described above. In the motion class detection circuit 158, an inter-frame difference is calculated from the data (SD pixel data) of the motion class tap selectively extracted by the third tap selection circuit 155, and the average of the absolute values of the differences is calculated. Then, a threshold value process is performed to detect a motion class that is a motion index.

Further, the coefficient data generation device 150 includes a re-quantization code Qi as the class information of the space class output from the space class detection circuit 157 and the class information MV of the motion class output from the motion class detection circuit 158.
And a class synthesizing circuit 159 for obtaining a class code CL indicating the class to which the pixel of interest relating to the HD signal (525p signal or 1050i signal) belongs.
This class synthesizing circuit 159 is configured similarly to the class synthesizing circuit 126 of the image signal conversion unit 110 described above.

Further, the coefficient data generating device 150 outputs the first HD pixel data y as target pixel data obtained from the HD signal supplied to the input terminal 151 and the first HD pixel data y corresponding to each HD pixel data y. Tap selection circuit 15
From the prediction tap data (SD pixel data) xi selectively extracted in step 3 and the class code CL output from the class synthesizing circuit 159 corresponding to each HD pixel data y. Has a normal equation generation unit 160 for generating a normal equation (see equation (11)) for obtaining the coefficient data wi.

In this case, the learning data described above is generated by a combination of one HD pixel data y and its corresponding n prediction tap pixel data. Therefore, a large amount of learning data is registered in the normal equation generation unit 160. A normal equation is generated. Although not shown, by arranging a delay circuit for time alignment in the preceding stage of the first tap selection circuit 153, the SD pixel data supplied from the first tap selection circuit 153 to the normal equation generation unit 160 The timing of xi can be adjusted.

The coefficient data generating device 150 is supplied with the data of the normal equation generated for each class by the normal equation generating section 160, solves the normal equation generated for each class, and solves the normal equation for each class. A coefficient data determining unit 161 for obtaining coefficient data wi;
and a coefficient memory 162 for storing i. In the coefficient data determination unit 161, the normal equation is solved by, for example, a sweeping-out method, and coefficient data wi is obtained.

The operation of the coefficient data generator 150 shown in FIG. 18 will be described. An HD signal (525p signal or 1050i signal) as a teacher signal is supplied to an input terminal 151. The HD signal is subjected to horizontal and vertical thinning processing by a two-dimensional thinning filter 152, and the SD signal as an input signal is obtained. A signal (525i signal) is generated.

In this case, when the first conversion method (the 525p signal is obtained from the 525i signal by the image signal conversion unit 110 in FIG. 1) is selected, the two-dimensional decimation filter 152 performs the thinning process on the 525p signal. Thus, an SD signal is generated. On the other hand, when the second conversion method (a 1050i signal is obtained from the 525i signal by the image signal conversion unit 110 in FIG. 1) is selected, the two-dimensional decimation filter 152 performs a thinning process on the 1050i signal to generate an SD signal. Is generated.

Further, in this case, the image quality of the image based on the generated SD signal corresponds to the image quality information X. For example, as the resolution of an image by an SD signal becomes lower,
The coefficient data for increasing the resolution of the image based on the HD signal generated by the image signal conversion unit 110 is obtained.

From this SD signal (525i signal), the second
The tap selection circuit 154 selectively extracts data (SD pixel data) of a space class tap located around the target pixel related to the HD signal (525p signal or 1050i signal). In the second tap selection circuit 154, taps are supplied based on the selected conversion method supplied from the tap selection control circuit 156 and the tap position information corresponding to the motion class detected by the motion class detection circuit 158. Is selected.

The space class tap data (SD pixel data) selectively taken out by the second tap selection circuit 154 is supplied to the space class detection circuit 157. In this space class detection circuit 157, each SD pixel data as the data of the space class tap is subjected to ADRC processing, and regenerated as class information of a space class (mainly a class classification for representing a waveform in space). The quantization code Qi is obtained (see equation (1)).

The third tap selection circuit 155 uses the SD signal generated by the two-dimensional thinning filter 152
Data (SD pixel data) of a motion class tap located around the target pixel related to the HD signal is selectively extracted. In this case, the third tap selection circuit 155 selects a tap based on tap position information supplied from the tap selection control circuit 156 and corresponding to the selected conversion method.

The motion class tap data (SD pixel data) selectively extracted by the third tap selection circuit 155 is supplied to the motion class detection circuit 158. The motion class detection circuit 158 obtains the class information MV of the motion class (mainly a class classification for representing the degree of motion) from each SD pixel data as the data of the motion class tap.

The motion information MV and the above-mentioned requantized code Qi are supplied to a class synthesis circuit 159. The class synthesis circuit 159 uses the motion information MV and the requantized code Qi to generate an HD signal (525p signal or 10
A class code CL indicating the class to which the pixel of interest pertaining to the 50i signal) belongs is obtained (see equation (3)).

The first tap selection circuit 153 converts the SD signal generated by the two-dimensional thinning filter 152
The data (SD pixel data) of the prediction tap located around the target pixel related to the HD signal is selectively extracted. In this case, the first tap selection circuit 153 selects a tap based on tap position information supplied from the tap selection control circuit 156 and corresponding to the selected conversion method.

Then, the HD supplied to the input terminal 151
Each HD pixel data y as target pixel data obtained from a signal, and data (SD pixel data) xi of a prediction tap selectively extracted by the first tap selection circuit 121 in correspondence with each HD pixel data y From the class code CL output from the class synthesizing circuit 159 corresponding to each of the HD pixel data y, the normal equation generating unit 160 generates a normal code for generating n coefficient data wi for each class. An equation is generated.

Then, the normal equation is solved in the coefficient data determination section 161 to obtain coefficient data wi for each class, and the coefficient data wi is stored in the coefficient memory 162 divided into addresses by class.

As described above, the coefficient data generator 150 shown in FIG. 18 can generate the coefficient data wi for each class stored in the information memory bank 135 of the image signal converter 110 shown in FIG.

In this case, the two-dimensional decimation filter 152 outputs the 525p signal or the 1-bit signal depending on the selected conversion method.
An SD signal (525i signal) is generated using the 050i signal. A first conversion method (obtains a 525p signal from the 525i signal in the image signal conversion unit 110) and a second conversion method (image signal conversion) The unit 110 can generate coefficient data corresponding to (a 1050i signal is obtained from a 525i signal).

The image quality of the image based on the SD signal generated by the two-dimensional thinning filter 152 can be changed by the image quality information X. Therefore, by changing the image quality of the image based on the SD signal and determining the coefficient data for each class, the coefficient data for each class in the plurality of pieces of image quality information X can be generated.

In the above-described embodiment, a linear linear equation is used as an estimation equation for generating an HD signal. However, a higher-order equation may be used as an estimation equation.

In the above embodiment, the SD signal (525i signal) is converted to the HD signal (525p signal or 1 signal).
050i signal), the present invention is not limited to this example, and the same applies to other cases where the first image signal is converted to the second image signal using an estimation formula. Of course, it can be applied.

In the above-described embodiment, a CRT display, a liquid crystal display, a plasma display, and a projector are described as examples of the image display device 111. However, the present invention is applicable to a case using another image display device. Can be similarly applied.

[0160]

According to the present invention, when the first image signal is converted into the second image signal, the pixel data of the target pixel related to the second image signal is converted into the second data indicating the type of the image display device. It is generated based on the image quality information acquired corresponding to the identification information of No. 1. Therefore, the image quality of the image based on the output image signal (second image signal) automatically adapts to the image display device, and the user does not need to adjust contrast, sharpness, and the like.

According to the present invention, when the second image signal is supplied to an image display device having an image quality adjusting function such as contrast and sharpness to display an image based on the second image signal, the image quality adjusting function is invalidated. It is assumed that.
Therefore, the second quality is adjusted by adjusting the image quality of the image display device.
This can prevent the image quality of the image from deteriorating due to the image signal, and can maximize the performance of the image signal conversion unit.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a television receiver as an embodiment.

FIG. 2 is a flowchart illustrating a control operation when an image display device is connected.

FIG. 3 is a block diagram illustrating a configuration of an image signal conversion unit.

FIG. 4 is a diagram for explaining a pixel positional relationship between a 525i signal and a 525p signal.

FIG. 5 is a diagram for explaining a pixel positional relationship between a 525i signal and a 1050i signal.

FIG. 6 is a diagram illustrating an example of a pixel positional relationship between 525i and 525p and a prediction tap.

FIG. 7 is a diagram illustrating an example of a pixel positional relationship between 525i and 525p and a prediction tap.

FIG. 8 is a diagram showing an example of a pixel positional relationship between 525i and 1050i and a prediction tap.

FIG. 9 is a diagram illustrating an example of a pixel positional relationship between 525i and 1050i and a prediction tap.

FIG. 10 is a diagram illustrating an example of a pixel positional relationship between 525i and 525p and a space class tap.

FIG. 11 is a diagram illustrating an example of a pixel positional relationship between 525i and 525p and a space class tap.

FIG. 12 is a diagram illustrating an example of a pixel position relationship between 525i and 1050i and a space class tap.

FIG. 13 is a diagram showing an example of a pixel position relationship between 525i and 1050i and a space class tap.

FIG. 14 is a diagram illustrating an example of a pixel positional relationship between 525i and 525p and a motion class tap.

FIG. 15 is a diagram illustrating an example of a pixel positional relationship between 525i and 1050i and a motion class tap.

FIG. 16 is a diagram for explaining line double-speed processing when a 525p signal is output.

FIG. 17 is a flowchart showing a learning flow of coefficient data.

FIG. 18 is a block diagram illustrating a configuration example of a coefficient data generation device.

FIG. 19 is a diagram illustrating an example of the relationship among the type of image display device, the tendency of coefficient data, the standard deviation σ, and the type of HD signal.

[Explanation of symbols]

100: television receiver, 101: system controller, 102: remote control signal receiving circuit, 105
... Reception antenna, 106 ... Tuner, 107
..External input terminals, 110, image signal converters, 11
DESCRIPTION OF SYMBOLS 1 ... Image display device, 121 ... 1st tap selection circuit, 122 ... 2nd tap selection circuit, 123
... third tap selection circuit, 124 ... space class detection circuit, 125 ... motion class detection circuit, 126
..Class synthesis circuit, 127 ... Estimation prediction calculation circuit,
128 ... line sequential conversion circuit, 129 ... output terminal,
130 to 133: register, 134: coefficient memory, 135: information memory bank, 150: coefficient data generator, 151: input terminal, 152 ...
A two-dimensional thinning filter, 153... A first tap selection circuit, 154... A second tap selection circuit, 155.
· Third tap selection circuit, 156 ··· Tap selection control circuit, 157 ··· Space class detection circuit, 158 ···
Motion class detection circuit, 159... Class synthesis circuit, 1
Reference numeral 60: normal equation generation unit, 161: coefficient data determination unit, 162: coefficient memory, 200: remote control transmitter, 301: CPU, 302: ROM,
303: bus controller, 401: CPU,
402: operation unit, 403: ROM, 404 ...
Bus controller 405 video signal input terminal 406 image quality adjustment unit 407 changeover switch 408 display processing unit 409 display unit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazushi Yoshikawa 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5C063 AA01 AA10 BA04 BA06 CA01 CA16 CA23 CA38

Claims (15)

[Claims] 1. An image signal conversion apparatus for converting a first image signal composed of a plurality of pixel data into a second image signal composed of a plurality of pixel data, comprising: First data selecting means for selecting a plurality of first pixel data located around a target pixel relating to a signal; and the plurality of first pixel data selected by the first data selecting means.
A class detection unit for detecting a class to which the pixel of interest belongs based on the pixel data of: an information input unit for inputting display device information including at least first identification information indicating a type of the image display device; An image quality information acquisition unit that acquires image quality information corresponding to the first identification information included in the display device information input to the information input unit; and a class detected by the class detection unit and the image quality information acquisition unit. An image signal conversion device comprising: pixel data generation means for generating pixel data of the pixel of interest in accordance with the acquired image quality information. 2. The image processing apparatus according to claim 1, further comprising a storage unit configured to store in advance a correspondence relationship between the first identification information and the image quality information, wherein the image quality information acquisition unit refers to the correspondence relationship stored in the storage unit. 2. The image signal conversion device according to claim 1, wherein the image quality information is obtained by performing the following. 3. A memory for storing coefficient data of an estimation formula generated in advance for each combination of a class detected by the class detection unit and image quality information acquired by the image quality information acquisition unit. A coefficient data generating means for generating the coefficient data corresponding to the class detected by the class detecting means and the image quality information acquired by the image quality information acquiring means; and Second data selecting means for selecting a plurality of second pixel data located around the pixel of interest relating to the second image signal; the coefficient data generated by the coefficient data generating means; and the second data selection. The plurality of second ones selected by the means
2. The image signal conversion apparatus according to claim 1, further comprising: a calculating unit that calculates pixel data of the target pixel from the pixel data of the target pixel using the estimation formula. 4. The coefficient data generating means stores coefficient data of the estimation formula generated in advance for each combination of the class detected by the class detecting means and the image quality information acquired by the image quality information acquiring means. A first memory unit; a first data reading unit that reads coefficient data of each class corresponding to the image quality information acquired by the image quality information acquiring unit from the first memory unit; and a first data reading unit. A second memory unit for storing the coefficient data of each class read by the above, and a second data reading unit for reading the coefficient data corresponding to the class detected by the class detecting unit from the second memory unit. The image signal conversion device according to claim 3, comprising: 5. A display device that outputs a command to disable the image quality adjustment function when the display device information input to the information input unit includes second identification information indicating that the image quality adjustment function is provided. The image signal conversion device according to claim 1, further comprising a control unit. 6. A connection detecting means for detecting connection of an image display device for supplying the second image signal, and when the connection detecting means detects connection of the image display device, the image display device includes: The image signal conversion device according to claim 1, further comprising a display device control unit that transmits a command requesting transmission of the display device information. 7. An image signal conversion method for converting a first image signal composed of a plurality of pixel data into a second image signal composed of a plurality of pixel data, the method comprising: converting the first image signal into the second image signal; Selecting a plurality of first pixel data located around the target pixel related to the signal; detecting a class to which the target pixel belongs based on the selected plurality of first pixel data; Inputting display device information including at least first identification information indicating a type of the image display device; and acquiring image quality information corresponding to the first identification information included in the input display device information. Generating pixel data of the pixel of interest in accordance with the detected class and the acquired image quality information. Signal conversion method. 8. The step of generating pixel data of the image pixel of interest includes: generating the coefficient data corresponding to the detected class and the acquired image quality information; Selecting a plurality of second pixel data located around the pixel of interest according to the second image signal; and generating the generated coefficient data and the selected plurality of second pixel data.
Calculating the pixel data of the target pixel from the pixel data using the estimation formula. 9. The method according to claim 1, further comprising the step of outputting a command for disabling the image quality adjustment function when the input display device information includes second identification information indicating that the image quality adjustment function is provided. The image signal conversion method according to claim 7, wherein 10. The image according to claim 7, further comprising a step of outputting a command requesting the display device information when an image display device that supplies the second image signal is connected. Signal conversion method. 11. An image signal input unit for inputting a first image signal composed of a plurality of pixel data, and a second image signal composed of a plurality of pixel data, the first image signal being input from the image signal input unit. An image signal conversion unit that converts the image signal into an image signal and outputs the image signal; and an image display device that displays an image based on the second image signal output from the image signal conversion unit. Storage means for storing display device information including at least first identification information indicating a type of image display device; and information transmitting means for transmitting the display device information stored in the storage means to the image signal conversion unit. Wherein the image signal conversion unit selects a plurality of first pixel data located around a pixel of interest according to the second image signal from the first image signal. Data selection means and said first of said plurality of first selected by the data selection means
Class detection means for detecting a class to which the pixel of interest belongs, information reception means for receiving the display device information sent from the image display device, and information reception means for receiving the information. Image quality information acquisition means for acquiring image quality information corresponding to the first identification information included in the display device information, and correspondence to the class detected by the class detection means and the image quality information acquired by the image quality information acquisition means And a pixel data generating means for generating pixel data of the pixel of interest. 12. The image signal conversion unit further includes a storage unit that stores in advance a correspondence relationship between the first identification information and the image quality information, and the image quality information acquisition unit stores the image data in the storage unit. 12. The image display device according to claim 11, wherein the image quality information is acquired by referring to the obtained correspondence. 13. A memory for storing coefficient data of an estimation formula generated in advance for each combination of a class detected by the class detection unit and image quality information acquired by the image quality information acquisition unit. A coefficient data generating means for generating the coefficient data corresponding to the class detected by the class detecting means and the image quality information acquired by the image quality information acquiring means; and Second data selecting means for selecting a plurality of second pixel data located around the pixel of interest relating to the second image signal; the coefficient data generated by the coefficient data generating means; and the second data selection. The plurality of second ones selected by the means
The image display device according to claim 11, further comprising: a calculating unit that calculates pixel data of the target pixel from the pixel data of the target pixel by using the estimation formula. 14. The image signal conversion section, when the image display device is connected, the image display device,
The image display device further includes command transmission means for transmitting a command requesting transmission of the display device information, wherein the image display device receives the command transmitted from the image signal conversion unit,
12. The apparatus according to claim 11, further comprising control means for controlling said information transmitting means so as to transmit said display device information to said image signal conversion unit based on said command received by said command receiving means. An image display device according to claim 1. 15. The image signal conversion unit invalidates the image quality adjustment function when the display device information received by the information receiving unit includes second identification information indicating that the image quality adjustment function is provided. Command transmitting means for transmitting a command to the image display device to the image display device, wherein the image display device receives a command for invalidating the image quality adjustment function transmitted from the image signal conversion unit, 2. The apparatus according to claim 1, further comprising control means for invalidating the image quality adjustment function based on the command received by the command receiving means.
2. The image display device according to 1.