JP2002199277A - Image data output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image data output device that independently applies scaling and multiplication of a weight coefficient to each of moving picture data and OSD data. SOLUTION: A synthesis circuit 5 composites moving picture data that are subjected to scaling by a scaling circuit 1 and multiplied with a weight coefficient by a weight coefficient multiplication circuit 3 with OSD data subjected to scaling by a scaling circuit 4 so as to improve the image quality of the synthesized image data when the synthesized image data are reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data output device for scaling image data in order to enlarge or reduce an image to be displayed.
The present invention relates to an image data output device that combines and outputs splay data (OSD data).

[0002]

2. Description of the Related Art Recently, in digital broadcasting and the like, OS
EPG (Electronic Program Gui) obtained from D data
OSD for displaying images other than the video of a broadcast program such as de) on the display together with the video of the broadcast program
Image data output devices having devices have been developed. In the image data output from such an image data output device, it is necessary to perform scaling on each of the image data for broadcast program video (called “moving image data”) and the OSD data in accordance with the resolution of the display. or,
At the pixel position to which the OSD data is given, the moving image data and the OSD data are weighted and added, and the combined data is reproduced.

FIG. 7 shows a configuration of a conventional image data output device. In the image data output device of FIG. 7, for example, a broadcast signal received by a tuner (not shown) is provided by separating moving image data and OSD data by a demultiplexer (not shown). In the image data output device of FIG. 7, a weight coefficient multiplying circuit 101 for multiplying moving image data by a weight coefficient (1-α), a weight coefficient multiplying circuit 102 for multiplying OSD data by a weight coefficient α, and a weight coefficient multiplying circuit 10
Moving image data and OS multiplied by weighting factors at 1,102
A combining circuit 103 for adding D data, and a combining circuit 103
And a scaling circuit 104 that performs scaling in accordance with the resolution of a display (not shown) that reproduces an image of image data obtained by combining moving image data and OSD data. It is assumed that the moving image data and the OSD data are data to be displayed on a display having the same resolution.

As described above, according to the conventional image data output device as shown in FIG.
First, the moving image data and the OSD data are subjected to weighting addition by the combining circuits 1 and 102 and the combining circuit 103. Then, the image data obtained by performing the weighted addition is subjected to scaling according to the resolution of the display and output.

[0005]

However, FIG.
When the weight coefficient is multiplied by the weight coefficient multiplication circuit 101 to the moving image data as shown in (a), the moving image data becomes as shown in FIG. 8B, and the moving image data represented by the smooth waveform has a sharp edge. appear. Therefore, when scaling is performed in a state where the weight coefficient is multiplied in this way, overshooting and undershooting are likely to occur at edges generated on moving image data, and scaling is performed in the original smooth state. Is more preferred. On the other hand, OS
D data is data for displaying characters and the like,
As shown in FIG. 9A, since there are many steep edge portions, scaling is performed in a state in which the weight difference is multiplied and the difference in the data amount of the edge portions is reduced as shown in FIG. 9B. Is preferred.

[0006] In view of such a problem, an object of the present invention is to provide an image data output device that independently multiplies and scales a moving image data and an OSD data by a weight coefficient.

[0007]

According to an aspect of the present invention, there is provided an image data output apparatus comprising: a first image data representing a video such as a moving image; And an image signal having a second image data representing an image having an image signal. The image data output apparatus for synthesizing and outputting the image signal first performs scaling on the first image data, and then weights the first image data. A second image data processing circuit that first multiplies the second image data by a weighting coefficient, and then performs scaling; and a second image data processing circuit that performs processing by the first image data processing circuit. A combining circuit for combining one image data and the second image data processed by the second image data processing circuit.

In such an image data output device,
When OSD data for displaying an EPG or the like and moving image data for displaying a broadcast program image are given, first image data having a smooth change like the moving image data is given to the first image data processing circuit. The second image data having many edge portions such as data is provided to the second image data processing circuit. The first image data processing circuit can perform scaling in a smooth state by performing scaling and then multiplying by a weight coefficient, thereby preventing image degradation. Further, the second image data processing circuit performs scaling after multiplying by the weighting coefficient, so that scaling can be performed in a state where the difference between the edge portions is small, and deterioration of the image can be prevented.

In the above image data output device, the weight coefficient multiplied by the first image data processing circuit is scaled according to the resolution of the image display device. Thus, images can be synthesized according to the resolution.

According to a third aspect of the present invention, there is provided an image data output apparatus.
An image signal having first image data representing a video such as a moving image and second image data composed of a plurality of image data representing an image having many edges such as characters and figures is provided. An image data output device that synthesizes and outputs a signal, a first scaling circuit that scales the first image data, and a weight coefficient multiplication that multiplies the image data scaled by the first scaling circuit by a weight coefficient A first combining circuit to which the second image data is provided, a plurality of image data constituting the second image data are combined to form one image data, and a first coefficient is multiplied by a weighting coefficient; A second scaling circuit for scaling the image data synthesized by the synthesis circuit; A second combining circuit for combining the image data sent from the second scaling circuit, and having a.

In such an image data output device,
When OSD data for displaying an EPG or the like and moving image data for displaying a broadcast program image are given, first image data that smoothly changes like the moving image data is given to the first scaling circuit. Then, after the scaling is performed by the first scaling circuit, the weighting coefficient is multiplied by the weighting coefficient multiplying circuit, whereby the scaling can be performed in a smooth state, and the deterioration of the image can be prevented. Also, O
The second image data having many edge portions, such as SD data, is provided to the first synthesis circuit. Then, by performing the scaling by the second scaling circuit after multiplying the weighting coefficient by the first synthesis circuit, the scaling can be performed in a state where the difference between the edge portions is reduced, and the deterioration of the image can be prevented. .

In the image data output device, when the first synthesizing circuit synthesizes a plurality of image data constituting the second image data, the first synthesizing circuit may include a plurality of the plurality of image data. The image data may be weighted and added.

According to a fifth aspect of the present invention, there is provided an image data output apparatus.
An image signal having first image data representing a video such as a moving image and second image data composed of a plurality of image data representing an image having many edges such as characters and figures is provided. An image data output device that outputs a signal as a plurality of image data according to the resolutions of a plurality of image display devices, wherein a plurality of first image data are subjected to scaling according to a resolution of each of the plurality of image display devices. One scaling circuit, a plurality of weight coefficient multiplication circuits for multiplying each of the image data scaled by the plurality of first scaling circuits by a weight coefficient,
A first combining circuit that receives the second image data, combines a plurality of image data constituting the second image data into one image data, and multiplies the image data by a weighting coefficient; In the synthesized image data,
A plurality of second scaling circuits for performing scaling according to the resolution of each of the plurality of image display devices; image data sent from each of the plurality of weight coefficient multiplication circuits; and image data sent from each of the plurality of second scaling circuits And a plurality of second combining circuits that combine the image data and generate and output image data corresponding to the resolution of each of the plurality of image display devices.

In such an image data output device, image data corresponding to a plurality of image display devices such as displays having different resolutions is generated. At this time, scaling according to the resolution of each image display device is performed by the first and second scaling circuits, and image data corresponding to the resolution of each image display device is generated and output by the second synthesis circuit.

In such an image data output device,
As described in claim 6, a memory for storing image data scaled by the plurality of second scaling circuits may be provided.

An image data output device according to claim 8 is
An image signal having first image data representing a video such as a moving image and second image data composed of a plurality of image data representing an image having many edges such as characters and figures is provided. An image data output device that outputs a signal as a plurality of image data corresponding to resolutions of a plurality of image display devices, wherein a plurality of first weight coefficient multiplication circuits for multiplying the plurality of first image data by a weight coefficient; A second weighting coefficient multiplying circuit for receiving the second image data and multiplying the second image data by a weighting coefficient;
A scaling circuit that performs scaling according to the resolution of each of the plurality of image display devices on the image data multiplied by the weight coefficient multiplication circuit; and image data sent from each of the plurality of first weight coefficient multiplication circuits. By combining with the image data sent from the scaling circuit,
A plurality of synthesizing circuits for generating and outputting image data corresponding to the resolution of each of the plurality of image display devices.

In such an image data output device, image data corresponding to an image display device such as a display having a plurality of different resolutions is generated similarly to the image data output device according to the fifth aspect. At this time, the scaling circuit performs scaling according to the resolution of each image display device, and image data corresponding to the resolution of each image display device is generated and output by a plurality of combining circuits.

In such an image data output device,
According to a ninth aspect of the present invention, there may be provided a memory for storing the image data scaled by the scaling circuit.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> A first embodiment of the present invention
An embodiment will be described with reference to the drawings. FIG.
1 is a block diagram illustrating an internal configuration of an image data output device according to the present embodiment.

The image data output device shown in FIG. 1 includes a scaling circuit 1 for scaling a moving image data according to the resolution of a display (not shown) for reproducing an image,
Weight coefficient multiplying circuit 2 for multiplying SD data by weight coefficient α
And a weight coefficient multiplying circuit 3 for multiplying the moving image data scaled by the scaling circuit 1 by a weight coefficient (1-fα), and O
Scaling circuit 4 for scaling SD data
And a synthesizing circuit 5 for adding the moving image data sent from the weight coefficient multiplying circuit 3 and the OSD data sent from the scaling circuit 4 to generate image data. still,
f is a value corresponding to the resolution of the display on which the image is reproduced, and varies according to the enlargement ratio in the scaling performed by the scaling circuit 1.

For example, when the image data output device having such a configuration is provided in a receiving device for digital broadcasting or the like, the OS
After the broadcast signal having the D data is received by the tuner, the moving image data and the OSD data are separated by the demultiplexer. Then, the separated moving image data and OSD data are transmitted to the image data output device having the configuration shown in FIG. 1 via different blocks. The configuration and operation of such a receiving device will be described later.

When the moving image data and the OSD data are given to the image data output device, the moving image data is first subjected to scaling in the scaling circuit 1 in accordance with the resolution of the display on which the image is reproduced. The scaling circuit 1 performs scaling on the moving image data by, for example, generating moving image data at a pixel position having no data by performing interpolation using a plurality of moving image data at peripheral pixel positions. The moving image data scaled by the scaling circuit 1 is sent to the weight coefficient multiplication circuit 3.

In the weight coefficient multiplying circuit 3, the moving image data at the pixel position where the image obtained from the OSD data is displayed is multiplied by the weight coefficient (1-fα). That is, the moving image data at the pixel position where the image obtained from the OSD data is not displayed is output as it is, and the moving image data at the pixel position where the image obtained from the OSD data is displayed is multiplied by the weight coefficient. The moving image data multiplied by the weight coefficient is transmitted to the synthesizing circuit 5.

On the other hand, the OSD data is first multiplied by the weight coefficient α in the weight coefficient multiplying circuit 2. Then, the OSD data multiplied by the weight coefficient is sent to the scaling circuit 4 and subjected to scaling according to the resolution of the display on which the image is reproduced. Also in the scaling circuit 4, the OSD data is scaled by generating the OSD data at the pixel position having no data by performing an interpolation process using the OSD data at the peripheral pixel position. The OSD data thus scaled is sent to the synthesizing circuit 5.

Then, the moving image data from the weighting coefficient multiplying circuit 3 and the scaling circuit 4
Are output to the synthesizing circuit 5 in synchronism. Therefore, at pixel positions where there is no display of an image obtained from OSD data, only moving image data is used as image data.
At a pixel position where an image obtained from the OSD data is displayed, data combined by adding the OSD data and the moving image data is output as image data.
Therefore, the image obtained by the OSD data is displayed such that the background becomes dark. <Second Embodiment> Regarding a second embodiment of the present invention,
This will be described with reference to the drawings. FIG. 2 is a block diagram illustrating an internal configuration of the image data output device according to the present embodiment. FIG.
In the image data output device of the first embodiment, portions used for the same purpose as the image data output device of FIG.

The image data output device shown in FIG. 2 includes a scaling circuit 10 for scaling moving image data in accordance with the resolution of a display (not shown) for reproducing an image,
An OSD data synthesizing circuit 11 for multiplying and synthesizing a plurality of OSD data by a weighting coefficient;
A weight coefficient multiplying circuit 12 for multiplying the moving image data scaled by 0 by a weight coefficient, a scaling circuit 13 for scaling the OSD data synthesized by the OSD data synthesizing circuit 11, and a signal transmitted from the weight coefficient multiplying circuit 12. And a synthesizing circuit 14 for adding the moving image data and the OSD data sent from the scaling circuit 13 to generate image data. The present embodiment will be described below assuming that two pieces of OSD data are supplied to the OSD data synthesizing circuit 11.

The OSD data synthesizing circuit 11 multiplies weighting coefficients in the weighting coefficient multiplying circuits 15 and 16 to which two OSD data representing two separate images are respectively applied, and weighting coefficient multiplying circuits 15 and 16 respectively. Done O
And an addition circuit 17 for adding SD data. In the image data output device configured as described above, assuming that the OSD data representing the image displayed on the top surface is given to the weight coefficient multiplication circuit 16, the weight coefficient multiplication circuit 12 assigns the weight coefficient f (1 −α1) (1-
α2) is multiplied, and the weight coefficient multiplication circuit 15
The D data is multiplied by a weight coefficient α1 (1−α2), and the OSD data is multiplied by a weight coefficient α2 in a weight coefficient multiplying circuit 16. Note that f is a value corresponding to the resolution of the display for reproducing the image, and varies depending on the enlargement ratio in the scaling performed by the scaling circuit 10.

In the image data output device having such a configuration, as in the first embodiment, moving image data and OSD
When the data is provided, the moving image data is first subjected to scaling in the scaling circuit 10 according to the resolution of the display on which the image is reproduced. Then, the image data scaled by the scaling circuit 10 is weighted by the weighting coefficient multiplying circuit 12 to the moving image data at the pixel position where the image obtained from the OSD data is represented by the weighting coefficient f (1-α1) (1-α2 ) Is multiplied.

On the other hand, the OSD data is first supplied to the OSD data synthesizing circuit 11, and the two OSD data are synthesized by performing weighted addition. In the OSD data synthesizing circuit 11, the OSD data representing the image displayed on the lower surface is given to the weighting coefficient multiplying circuit 15 and the weighting coefficient α1
(1-α2) is multiplied by O representing an image displayed on the upper surface.
The SD data is provided to the weight coefficient multiplication circuit 16 and multiplied by the weight coefficient α2. Also, 2 multiplied by this weighting factor
When the two OSD data are given to the adding circuit 17 from the weight coefficient multiplying circuits 15 and 16 and combined as one OSD data, they are sent to the scaling circuit 13 and subjected to scaling.

Then, the moving image data from the weighting coefficient multiplying circuit 11 and the OSD data from the scaling circuit 12 are synchronously output to the synthesizing circuit 5 so that the synthesizing circuit 14 is provided with the moving image data and the OSD data at the same pixel position. Is done. Therefore, at a pixel position where an image obtained from OSD data is not displayed, only moving image data is used as image data, and at a pixel position where an image obtained from OSD data is displayed, OSD data and moving image data are added and synthesized. The obtained data is output as image data. Therefore, the image obtained by the OSD data is displayed such that the background becomes dark.

In the first and second embodiments, O
Although the moving image data at the pixel position where the image obtained from the SD data is not displayed is not multiplied by the weight coefficient, all the moving image data is multiplied by the weight coefficient. May be displayed so that the entire image displayed by is darkened. <Third Embodiment of Receiving Apparatus Using Image Data Output Apparatus of the Present Invention> An embodiment of a receiving apparatus including an image data output apparatus of the present invention and outputting image data to a plurality of displays having different resolutions will be described. This will be described with reference to FIG. FIG.
FIG. 3 is a block diagram illustrating an internal configuration of a receiving device in the present embodiment. FIG. 4 is a block diagram showing the internal configuration of the image data output device provided in the receiving device of FIG.
In the image data output device shown in FIG. 4, parts used for the same purpose as the image data output device shown in FIG.
The same reference numerals are given and the detailed description is omitted. or,
The receiving device in the present embodiment is a device that outputs image data to two displays A and B having different resolutions.

The receiving apparatus shown in FIG.
Tuner 22 for receiving a broadcast signal via antenna 21
A demultiplexer 23 that separates a broadcast signal sent from the tuner 22 into a signal for moving image data and a signal for OSD data; and a decoder that decodes the MPEG-encoded signal supplied from the demultiplexer 23 to convert the moving image data. MPEG decoder 24 to generate and demultiplexer 2
CPU (Central Processing Unit) 2 that generates a plurality of OSD data by processing a signal given from
5, the bus line 26, and the OSD generated by the CPU 25.
It has a memory 27 to which data is transmitted via a bus 26, and an image data output device 28 for synthesizing the OSD data stored in the memory 27 and the moving image data generated by the MPEG decoder 24 and outputting the combined data.

When the broadcast signal received from the antenna 21 and the tuner 22 is supplied to the demultiplexer 23, the receiving apparatus configured as described above separates the broadcast signal into two signals, a video data signal and an OSD data signal. Then, each signal is supplied to the MPEG decoder 24 and the CPU 25. In the MPEG decoder 24, the MPE
The G-encoded video data signal is decoded to generate video data, and the CPU 25 processes the OSD data signal to generate a plurality of OSD data representing each of a plurality of images. .

When the moving image data and the plurality of OSD data are generated as described above, the plurality of OSD data are
6 and is stored in the memory 27, and the moving image data is sent to the image data output device 28. The plurality of OSD data stored in the memory 27 is transmitted to the image data output device 28 via the bus line 26. As described above, the plurality of OSD data and the moving image data are transmitted to the image data output device 2.
When the image data is transmitted to the image data 8, the image data combined so that the image displayed by the plurality of OSD data is displayed on the upper surface of the image displayed by the moving image data is output. Further, in the image data output device 28, scaling is performed on moving image data and OSD data in order to output image data corresponding to a display having two different resolutions.

The image data output device 28 provided in such a receiving device is configured as shown in FIG. An image data output device 28 shown in FIG. 4 includes scaling circuits 31a and 31b for scaling moving image data, and weight coefficient multiplication circuits 32a and 31b for multiplying moving image data sent from each of the scaling circuits 31a and 31b by a weight coefficient.
32b, an OSD data synthesizing circuit 33 for weighting and adding the two OSD data and synthesizing them; scaling circuits 34a and 34b for scaling the OSD data sent from the OSD data synthesizing circuit 33; Weight coefficient generation circuits 35a and 35b for generating weight coefficients to be multiplied by the weight coefficient multiplication circuits 32a and 32b from the weight coefficients multiplied by the data, the bus line 36, and the OSD scaled by the scaling circuits 34a and 34b. Data and weight coefficient generation circuit 35
a, 35b, the weighting coefficients generated by the memory 37 are transmitted via the bus line 36,
A synthesizing circuit 38a for synthesizing the SD data and the moving image data transmitted from the weight coefficient multiplying circuit 32a, and a synthesizing circuit 38b for synthesizing the OSD data stored in the memory 37 and the moving image data transmitted from the weight coefficient multiplying circuit 32b And

The image data output device 28 thus configured includes a scaling circuit 31a, a weight coefficient multiplication circuit 3
2a, scaling circuit 34a, weight coefficient generation circuit 35
a and the synthesizing circuit 38a operate to generate image data to be given to the display A. Further, the scaling circuit 31b, the weight coefficient multiplication circuit 32b, the scaling circuit 34b, the weight coefficient generation circuit 35b, and the synthesis circuit 38b operate to generate image data to be given to the display B.

As shown in FIG. 5, the OSD data synthesizing circuit 33, as in the case of the OSD data synthesizing circuit 11 in the second embodiment (FIG. 2), has two OSD data representing two separate images, respectively. There are provided weight coefficient multiplication circuits 41 and 42 provided from the memory 27 via the bus line 26, and an addition circuit 43 multiplied by the weight coefficient in each of the weight coefficient multiplication circuits 41 and 42. In the OSD data synthesizing circuit 33, the OSD data is multiplied by a weighting factor α1 (1−α2) in a weighting factor multiplying circuit 41, and the OSD data is multiplied by a weighting factor α2 in a weighting factor multiplying circuit.

When the two OSD data stored in the memory 27 are supplied to the OSD data synthesizing circuit 33 via the bus line 26, the image data output device 28 having the above-described configuration is weighted and added to the two OSD data. To generate one OSD data. The OSD data synthesized by the OSD data synthesizing circuit 33 is supplied to each of the scaling circuits 34a and 34b, and is subjected to scaling according to two displays having different resolutions. Also, in each of the weight coefficient generation circuits 35a and 35b, the weight coefficients (1-α1) and (1-α2) for multiplying the OSD data by the OSD data synthesis circuit 33 are provided.
, Weighting factors f1 (1−α1) (1−α2), f to be given to the weighting factor multiplying circuits 32a and 32b, respectively.
2 (1-α1) (1-α2) is generated. The coefficient f1 is a value corresponding to the resolution of the display A, and the coefficient f1
2 is a value corresponding to the resolution of the display B.

The OSD data for the two displays scaled by the scaling circuits 34a and 34b and the weight coefficients f1 (1-α1) (1-α2) and f2 () generated by the weight coefficient generation circuits 35a and 35b. 1-α1) (1-
α2) is sent to the memory 37 via the bus line 36. The OSD data and weight coefficient f1 (1-α1) (1-α2) for display A and the OSD data and weight coefficient f2 (1-α1) (1-α2) for display B are stored in the memory 37, respectively. Is stored in another set area.

When the OSD data is stored in the memory 37 and an image displayed by the stored OSD data is requested to be displayed, the weight coefficient stored in the memory 37 is displayed. f1 (1-α1) (1-
α2) and f2 (1−α1) (1−α2) are provided to the weight coefficient multiplication circuits 32a and 32b, respectively. Then, in the weight coefficient multiplication circuits 32a and 32b, the scaling circuit 3
Weighting coefficients f1 (1−α1) (1−α2) and f2 (1) are assigned to the moving image data scaled by 1a and 31b, respectively.
−α1) (1−α2).

Also, as described above, the weight coefficient multiplying circuits 32a,
The moving image data multiplied by the weighting factor from 32b is sent to the combining circuits 38a and 38b as moving image data for the displays A and B, respectively, and the OSD data for the displays A and B stored in the memory 37 is transmitted to the bus. The signal is sent to the combining circuits 38a and 38b via the line 36. Then, the combining circuit 38a combines the moving image data for the display A and the OSD data to generate image data, and the combining circuit 38b combines the moving image data for the display B and the OSD data to generate image data. . These combining circuits 38a and 38b
The image data for the displays A and B generated in step (1) are output.

When there is no image displayed by the OSD data and only the image displayed by the moving image data is displayed, the moving image data scaled by the scaling circuits 31a and 31b is processed by the weight coefficient multiplication circuit 32a,
Not multiplied by 32b. And the scaling circuit 31
Only the moving image data subjected to scaling by a and 31b are output as image data via the combining circuits 38a and 38b. Also, the moving image data from the weight coefficient multiplying circuits 32a and 32b and the OSD data stored in the memory 37 are synchronously output so that the moving image data and the OSD data at the same pixel position are given to the combining circuits 38a and 38b. You.

By configuring the image data output device in this manner, it is not necessary to provide an OSD data synthesizing circuit for each display having a different resolution, and it is possible to use one OSD data synthesizing circuit. Further, since the OSD data synthesized by the OSD data synthesis circuit can be superimposed and stored in the memory, the scale of the image data output device can be reduced. <Modification of Third Embodiment> FIG. 6 shows an internal configuration of an image data output device 29 that can be provided in the receiving device of FIG. 3 instead of the image data output device 28 of the third embodiment. It is a block diagram. In the image data output device of FIG. 6, parts used for the same purpose as the image data output device 28 of FIG. 4 are denoted by the same reference numerals.

An image data output device 29 shown in FIG. 6 includes a scaling circuit 31 for scaling moving image data.
a and 31b, and an image output synthesizing device 30 which receives outputs of the scaling circuits 31a and 31b and OSD data and generates image data to be given to the display A and the display B. Here, the image output synthesizing device 30 can be constituted by, for example, a one-chip LSI.

The image output synthesizing device 30 includes weight coefficient multiplying circuits 32a and 32b for multiplying the moving image data sent from each of the scaling circuits 31a and 31b by a weight coefficient.
And the two OSD data are combined by weighting and adding
SD data synthesis circuit 33 and OSD data synthesis circuit 33
A scaling circuit 34 for scaling the OSD data sent from the OSD data, a bus line 36, and the OSD data and O
A memory 37 in which the weight coefficient multiplied by the OSD data in the SD data synthesizing circuit 33 is transmitted via the bus line 36
A combining circuit 38a for combining the OSD data stored in the memory 37 with the moving image data transmitted from the weight coefficient multiplying circuit 32a, and a moving image transmitted from the OSD data stored in the memory 37 and the weight coefficient multiplying circuit 32b. A synthesizing circuit 38b for synthesizing data.

In the image output synthesizing device 30, the weight coefficient multiplying circuit 32a, the scaling circuit 34, and the synthesizing circuit 3
8a performs an operation for generating image data to be given to the display A. Also, the weight coefficient multiplication circuit 32
b, the scaling circuit 34, and the synthesis circuit 38b
A process for generating image data to be given to the display B is performed. That is, in the image data output device 29, the scaling circuit 34 applies
It is assumed that different scaling processes can be performed according to different resolutions of the output display.

Further, the OSD data synthesizing circuit 33
Similarly to the OSD data synthesis circuit 33 in the embodiment, the weight coefficient multiplication circuit 41 multiplies one OSD data by the weight coefficient α1 (1−α2), and the weight coefficient multiplication circuit 42
Multiplies the other OSD data by the weight coefficient α2.

In the image data output device 29 configured as described above, the two OSD data stored in the memory 27 are given to the OSD data synthesizing circuit 33 via the bus line 26, and the two OSD data are weighted. One OSD data is generated by performing the coefficient addition. OS
The OSD data obtained by the synthesis by the D data synthesis circuit 33 is supplied to a scaling circuit 34, which performs scaling according to two displays having different resolutions.
The result is stored in the memory 37.

In the scaling circuit 34, the OSD
Based on the weighting factors (1−α1) and (1−α2) for multiplying the OSD data by the data synthesis circuit 33, weighting factors to be given to the weighting factor multiplying circuits 32a and 32b are generated by scaling.

The OSD data for the two displays scaled by the scaling circuit 34 is sent to the memory 37 via the bus line 36.

Then, the OSD data and the weighting factor for the display A and the OSD data and the weighting factor for the display B are stored in different areas set in the memory 37, respectively.

As described above, when the OSD data is stored in the memory 37, when it is requested that the image displayed by the stored OSD data is displayed,
The weighting factors stored in the memory 37 are given to the weighting factor multiplying circuits 32a and 32b, respectively. Then, in the weight coefficient multiplication circuits 32a and 32b, the scaling circuit 3
Each of the moving image data from 1a and 31b is multiplied by a weight coefficient.

The weight coefficient multiplying circuit 32
The moving image data multiplied by the weight coefficients from a and 32b are sent to the combining circuits 38a and 38b as moving image data for the display A and the display B, respectively. At the same time, the displays A,
The OSD data for the display B is transmitted to the combining circuits 38a and 38b via the bus line 36.

The moving image data and the OSD data for the display A are synthesized by the synthesizing circuit 38a to generate image data, and the moving image data and the OSD data for the display B are synthesized by the synthesizing circuit 38b to form the image data. Generated. This synthesis circuit 3
The image data generated in 8a and 38b are output to the display A and the display B, respectively.

The other structure is the same as that of the image data output device 28 shown in FIG. With such a configuration, the same effect as in the third embodiment can be obtained.

[0056]

According to the present invention, image data having a smooth change such as moving image data is scaled and then multiplied by a weighting factor. Is scaled. Therefore, image degradation such as overshoot and undershoot can be reduced. In addition, since image data having many edges such as OSD data is scaled after being multiplied by a weighting factor, a state in which the difference between the values of the edge portions is smaller than when scaling is performed first. Is scaled. Therefore, values such as overshoot and undershoot can be reduced to reduce image degradation. Since the image data to be processed in this way is synthesized, when the synthesized image data is reproduced on the image display device,
The image quality is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an internal configuration of an image data output device according to a first embodiment.

FIG. 2 is a block diagram showing an internal configuration of an image data output device according to a second embodiment.

FIG. 3 is a block diagram showing an internal configuration of a receiving device using an image data output device of the present invention as a third embodiment.

FIG. 4 is a block diagram showing an internal configuration of an image data output device provided in the receiving device of FIG. 3;

5 is an OSD provided in the image data output device of FIG.
FIG. 2 is a block diagram illustrating an internal configuration of a data synthesis circuit.

FIG. 6 is a block diagram showing an internal configuration of an OSD data synthesizing circuit provided in the image data output device of FIG. 4 as a modification of the third embodiment.

FIG. 7 is a block diagram showing the internal configuration of a conventional image data output device.

FIG. 8 is a diagram illustrating a waveform of moving image data.

FIG. 9 is a diagram showing a waveform of OSD data.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scaling circuit 2 Weight coefficient multiplication circuit 3 Weight coefficient multiplication circuit 4 Scaling circuit 5 Synthesis circuit

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tatsuo Hiramatsu 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 5C023 AA02 AA18 BA11 CA01 CA05 5C082 AA02 BA02 BA12 BA27 BB44 BC05 CA33 CA34 CA56 CB01 DA51 DA86 MM10

Claims (9)

[Claims] 1. An image signal having first image data representing a video such as a moving image and second image data representing an image having many edges such as characters and figures is provided.
In an image data output device that synthesizes and outputs the image signal, first, after scaling the first image data,
A first image data processing circuit that multiplies a weighting coefficient; a second image data processing circuit that first multiplies the second image data by a weighting coefficient and then performs scaling; A combining circuit for combining the first image data and the second image data processed by the second image data processing circuit. 2. The image data output device according to claim 1, wherein the weight coefficient multiplied by the first image data processing circuit is scaled according to the resolution of the image display device. 3. First image data representing a video such as a moving image, and second image data composed of a plurality of image data representing an image having many edges such as characters and figures.
An image data output device that receives an image signal having the following formulas, and combines and outputs the image signal: a first scaling circuit that scales the first image data; and an image that is scaled by the first scaling circuit. A weighting coefficient multiplying circuit for multiplying the data by a weighting coefficient; and the second image data is provided, and a plurality of image data constituting the second image data are combined into one image data and multiplied by the weighting coefficient. A first combining circuit that performs scaling, a second scaling circuit that performs scaling on the image data combined by the first combining circuit, an image data that is sent from the weight coefficient multiplying circuit, and an image that is sent from the second scaling circuit. An image data output device, comprising: a second synthesis circuit that synthesizes data. 4. The method according to claim 3, wherein the first combining circuit performs weighted addition on the plurality of image data when combining the plurality of image data constituting the second image data. Image data output device. 5. First image data representing a video such as a moving image, and second image data composed of a plurality of image data representing an image having many edges such as characters and figures;
An image data output device which is provided with an image signal having the following, and outputs the image signal as a plurality of image data corresponding to the resolutions of a plurality of image display devices, wherein the first image data includes: A plurality of first scaling circuits for performing scaling according to a resolution; a plurality of weight coefficient multiplication circuits for multiplying each of the image data scaled by the plurality of first scaling circuits by a weight coefficient; and the second image data And a first combining circuit for combining a plurality of image data constituting the second image data into one image data and multiplying the image data by a weighting factor; and image data combined by the first combining circuit. A plurality of second scaling circuits for performing scaling according to the resolution of each of the plurality of image display devices; Combining image data sent from each of the plurality of weight coefficient multiplication circuits with image data sent from each of the plurality of second scaling circuits to generate image data corresponding to the resolution of each of the plurality of image display devices An image data output device comprising: a plurality of second synthesis circuits for outputting the image data; 6. The image data output device according to claim 5, further comprising a memory for storing image data scaled by said plurality of second scaling circuits. 7. The image data according to claim 3, wherein a weighting factor multiplied by the weighting factor multiplying circuit is scaled according to a resolution of an image display device. Output device. 8. First image data representing a video such as a moving image, second image data composed of a plurality of image data representing an image having many edges such as characters and figures, and
An image data output device which is provided with an image signal having the following formulas and outputs the image signal as a plurality of image data corresponding to the resolutions of a plurality of image display devices: A first weighting factor multiplying circuit, a second weighting factor multiplying circuit that receives the second image data and multiplies the second image data by a weighting factor, and an image data multiplied by the second weighting factor multiplying circuit To
A scaling circuit that performs scaling according to the resolution of each of the plurality of image display devices; and synthesizes image data sent from each of the plurality of first weight coefficient multiplication circuits and image data sent from the scaling circuit. And a plurality of combining circuits for generating and outputting image data corresponding to the resolution of each of the plurality of image display devices. 9. The image data output device according to claim 8, further comprising a memory for storing the image data scaled by the scaling circuit.