JPH09154154A - Video signal processing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the processing unit by which any of various output modes for a video output is selected by switching. SOLUTION: A video signal I generated by a charge coupled device(CCD) solid-state image pickup element 2 is fed to a signal processing circuit 3. The signal processing circuit 3 is made up of a sample-and-hold section, an automatic gain control(AGC) section, an A/D converter, a color separation processing section, a color arithmetic processing section, a color encode processing section, a D/A converter or the like. Then the signal processing circuit 3 outputs output data being the result of signal processing. Output data generated by the signal processing circuit 3 are fed to a selector 4. The selector 4 has three output channels CH1-CH3 and selects the output data sent from the signal processing circuit 3 according to any of output modes 1-6 set externally and the output data are outputted from the output channels CH1-CH3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing device.

[0002]

2. Description of the Related Art In a video signal processing device, a CCD
(Charge Coupled Device) Sample hold and AGC (Auto
Gain control), gamma correction, contour correction, etc. are performed. In the case of color imaging, in addition to these processes, processes such as color separation, color calculation, and color encoding are performed. These processes are divided into those suitable for analog signal processing and those suitable for digital signal processing, and are processed in the analog signal processing unit or the digital signal processing unit, respectively. The analog signal processing section and the digital signal processing section are each configured by an independent LSI. In this way, as a result of various kinds of signal processing, the video signal output from the video signal processing device is a composite of the luminance signal, the color difference signal, and the synchronization signal.

[0003]

In recent years, in various external devices which receive the output of the video signal processing device, the luminance signal,
Instead of receiving the video signal in which the color difference signal and the synchronization signal are combined, there are cases where it is desired to receive the luminance signal and the color difference signal in a separated state, or to receive them in the state of digital data. For example, when a personal computer is used as an external device and image processing is performed, it is desirable to receive the luminance signal, the digital color difference data, and the color difference data synchronization signal in separate states. However, in the conventional video signal processing device, only a video signal can be output, so that such a demand cannot be met.

The present invention has been made in order to satisfy the above requirements, and an object thereof is to provide a video signal processing device capable of variously switching the output mode of each video output.

[0005]

According to a first aspect of the present invention, various processes are stepwise performed on a video signal representing a continuous image on a screen-by-screen basis to generate a video output according to a predetermined format. The signal processing circuit (3) and the output at each stage of signal processing of the signal processing circuit (3) are respectively taken in, and the outputs at each stage are combined and selected by a predetermined number of channels according to the set output mode. The gist is that it has a selector (4) for outputting the selected output to the outside.

According to a second aspect of the present invention, in the video signal processing device according to the first aspect, the signal processing circuit (3) is provided.
Is a color separation process for separating the video signal into predetermined color components to generate a plurality of color component information, and three primary color information (R, R associated with three primary colors based on the plurality of color component information).
G, B) and complementary color information (Y
e, Cy, Mg), a color calculation process for generating at least three of them, a brightness calculation process for generating brightness information (Y) based on the plurality of color component information, and a color calculation process based on the plurality of color component information. Color difference information (U, V) to generate two types of color difference information (U, V), a balance modulation process that balance-modulates the two types of color difference information to generate color information (C), and the luminance information (Y). An addition process of superimposing the color information (C) and further superimposing synchronization information to generate video information (VIDEO);
It is a gist of the present invention to include at least two of the above processes and to supply the output information at each processing stage to the selector (4).

According to a third aspect of the present invention, in the video signal processing apparatus according to the second aspect, the selector (4) is
A first output mode having three output channels (ch1 to ch3) for selecting and outputting the video information (VIDEO), luminance information (Y) and color information (C), and luminance information (Y) and A second output mode for selecting and outputting color information (C), a third output mode for selecting and outputting the three primary color information (R, G, B), luminance information (Y), and the above A fourth output mode for selecting and outputting two types of color difference information (U, V), luminance information (Y), and time division information for extracting two types of color difference information (U, V) in time division. (U / V) is selected, and the fifth output mode of outputting together with the synchronization signal (Suv) of the time division information (U / V), luminance information (Y), and two types of color difference information (U). , V) is selected by time division, and the time division information (Y / U / V) is selected. / V) of the synchronization signal (Syu
The gist is to operate in at least two output modes out of the sixth output mode in which the output is performed in combination with v).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block configuration of a video signal processing device 1 of this embodiment. The video signal processing device 1 is composed of a signal processing circuit 3 and a selector 4.

The signal processing circuit 3 is connected to the CCD solid-state image pickup device 2 driven by a well-known method, and the continuous video signal I is taken in pixel by pixel. The signal processing circuit 3 includes a sample hold unit, an AGC unit, an A / D (Analog)
/ Digital) converter, color separation processing unit, color calculation processing unit, color encoding processing unit, D / A (Digital / Analog) converter, and the like.

For example, in the sample hold section, the video signal I which repeats the reference level and the signal level is sampled and held for each level, and the difference between them is taken out. AG
In the C section, a predetermined gain is given to the output of the sample hold section, and the average level is kept within an appropriate range.

The A / D converter converts the video signal I which has been subjected to a predetermined analog processing into image data which is digital data. In the color separation processing section, the image data is separated for each color component according to the configuration of the color filter mounted on the CCD solid-state image sensor 2.

The color calculation processing section adds or subtracts each color component to obtain the three primary color data R, G, B representing each color component of red, green and blue, the brightness data Y representing brightness, and further the brightness. Color difference data U representing the difference between Y and the primary color data R, and color difference data V representing the difference between the luminance Y and the primary color data B are generated.

In the color encode processing section, the two color difference data U and V are subjected to balanced modulation processing to generate color data C, and this color data C is also referred to as luminance data Y.
To produce video data VIDEO. Also,
In the process of generating the video data VIDEO, synchronization components representing horizontal scanning and vertical scanning timings are added.

As a result, the signal processing circuit 3 can output the following data, which are the signal processing results. (1) Video data VIDEO (2) Luminance data Y (3) Color data C (4) Color difference data U (5) Color difference data V (6) Primary color data R (7) Primary color data G (8) Primary color data B (9 ) Time-division data U / V for time-division extraction of color difference data U, V (10) Sync signal Suv (11) Time-division data for time-division data U / V Time-division data for extraction of luminance data Y and color-difference data U, V Y / U / V (12) Time division data Y / U / V synchronization signal Syuv Each output data (1) to (12) generated from the signal processing circuit 3 is sent to the selector 4.

The selector 4 has three output channels ch1 to ch.
2, each output data sent from the signal processing circuit 3 is selected in accordance with each output mode 1 to 6 set from the outside, and each output is simultaneously output from each output channel ch1 to ch3. Output the data.

That is, in the output mode 1, the video data VIDEO is output from the output channel ch1, the luminance data Y is output from the output channel ch2, and the color data C is output from the output channel ch3.

In output mode 2, luminance data Y is output from the output channel ch1 and color data C is output from the output channel ch2. In the output mode 3, the primary color data G is output from the output channel ch1, the primary color data R is output from the output channel ch2, and the primary color data B is output from the output channel ch3.

In the output mode 4, the luminance data Y is output from the output channel ch1, the color difference data U is output from the output channel ch2, and the color difference data V is output from the output channel ch3. In output mode 5, luminance data Y is output from output channel ch1, time division data U / V is output from output channel ch2, output channel ch3.
To output the synchronization signal Suv.

In the output mode 6, the time-division data Y / U / V is output from the output channel ch1 and the synchronization signal Syuv is output from the output channel ch2. FIG. 3 shows the internal structure of the selector 4.

The selector 4 is composed of three selector circuits 5-7. Each selector circuit 5-7 has six inputs 1-6 and one output OUT. Selector circuit 5
Output OUT becomes output channel ch1 and selector circuit 6
Output OUT becomes output channel ch2, and the selector circuit 7
Output OUT is output channel ch3. Each selector circuit 5 to 7 outputs each data input to each input 1 to 6 from the output OUT according to each output mode 1 to 6 set from the outside. For example, in the output mode 1, each selector circuit 5 to 7 outputs the video data VIDEO, the luminance data Y, and the color data C input to the respective inputs 1 from the respective outputs OUT.

As described above, according to this embodiment, the following actions and effects can be obtained. (1) By setting output modes 1 to 6 from the outside, three output data corresponding to the output mode can be output from each output channel ch1 to ch3.

(2) From the above (1), by setting the output modes 1 to 6 corresponding to the video output required by various external devices receiving the output of the video signal processing device 1, the required video output (output Data) can be obtained from each output channel ch1 to ch3. As a result, the range of applications that receive the output of the video signal processing device 1 can be expanded.

(3) From the above (2), when the color television is used as the external device, the output mode 1 is selected,
The output data is passed through a D / A converter and taken out as an analog signal. In this case, the video signal or the luminance signal and the color signal required by the color television can be obtained.

(4) From (2) above, when a monochrome television is used as the external device, the output mode 1 is selected, and only the output data of the output channel ch2 is passed through the D / A converter and converted into an analog signal. I will take it out.
In this case, the luminance signal required by the monochrome television can be obtained.

(5) From the above (2), when a personal computer is used as an external device and image processing is performed, output modes 3 to 6 are selected. In this case, since the three primary color data R, G, B or the luminance data Y and the color difference data U, V can be obtained separately, the image processing in the personal computer becomes easy.

(6) By configuring the selector 4 as shown in FIG. 3, the number of inputs / outputs (inputs 1-6 and outputs OUT) of the selector 4 (each selector circuit 5-7) is minimized. You can

The above embodiment may be modified as follows, and the same operation and effect can be obtained in such a case. (1) In output mode 1, only video data VIDEO is output, and luminance data Y and color data C are not output.

(2) In output mode 5, only the luminance data Y and the time division data U / V are output and the synchronization signal S
Do not output uv. (3) In output mode 6, time division data Y / U / V
Is output, and the synchronization signal Syuv is not output.

(4) The output modes 1 to 6 and the output channels ch1 to ch3 are combined other than those shown in FIG. (5) Any output mode among the output modes 1 to 6 is omitted. For example, the output modes 4 to 6 are omitted, and the output modes 1 to
Only perform 3.

(6) A part or all of each output data having a digital structure is replaced with an output signal having an analog structure. (7) The present invention is applied not to the video signal processing device 1 for processing the video signal I generated by the CCD solid-state image pickup device 2 but to a video signal processing device for processing a video signal sent from another transmission medium.

The transmission medium is a LAN (Local Ar
Communication media such as ea Network), video CD (Compac
t Disk), DVD (Digital Video Disk) and VTR
(Video Tape Recoder) and other storage media, terrestrial broadcasting and satellite broadcasting, and CATV (Community Antenna Tele)
vision) and other broadcast media are included.

[0032]

As described above in detail, according to the present invention, it is possible to provide a video signal processing device capable of switching various output modes of video output. Therefore, it becomes possible to simplify the imaging system including the video signal processing device,
Cost reduction can be expected.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of one embodiment.

FIG. 2 is an explanatory diagram for explaining an embodiment.

FIG. 3 is a block circuit diagram of a main part of one embodiment.

[Explanation of symbols]

 3 ... Signal processing circuit 4 ... Selector ch1 to ch3 ... Output channel VIDEO ... Video data Y ... Luminance data C ... Color data U ... Color difference data V ... Color difference data R ... Primary color data G ... Primary color data B ... Primary color data U / V ... Time division data Suv ... Sync signal Y / U / V ... Time division data Syuv ... Sync signal

Claims (3)

[Claims] 1. A signal processing circuit (3) for performing various processes stepwise on a video signal representing a continuous image on a screen-by-screen basis to generate a video output according to a predetermined format, and the signal processing circuit (3). A selector (4) for fetching the output at each stage of the signal processing of 3), selecting the output at each stage by combining a predetermined number of channels according to the set output mode, and outputting the selected output to the outside. )
And a video signal processing device. 2. The video signal processing device according to claim 1, wherein the signal processing circuit (3) separates the video signal into predetermined color components to generate a plurality of color component information, and , At least three of the three primary color information (R, G, B) associated with the three primary colors based on the plurality of color component information and the complementary color information (Ye, Cy, Mg) associated with the complementary color thereof.
Two color difference information (U, V) based on the plurality of color component information, and a luminance calculation process that generates luminance information (Y) based on the plurality of color component information. A color difference calculation process for generating the color difference information, a balance modulation process for balance-modulating the two types of color difference information to generate color information (C), and superimposing the color information (C) on the luminance information (Y). A video signal processing device including at least two processes of an addition process for superimposing synchronization information to generate video information (VIDEO), and output information at each processing stage is supplied to the selector (4). 3. The video signal processing device according to claim 2, wherein the selector (4) has three output channels (ch1 to ch1).
3), a first output mode for selecting and outputting the video information (VIDEO), luminance information (Y) and color information (C), and selecting luminance information (Y) and color information (C) A second output mode in which the three primary color information (R, G, B) are selected and output, and luminance information (Y) and the two types of color difference information (U , V) are selected and outputted, luminance information (Y), and time division information (U / V) in which two types of color difference information (U, V) are extracted in time division. A fifth output mode that is selected and output together with the synchronization signal (Suv) of this time division information (U / V), and luminance information (Y) and two types of color difference information (U, V) are time division. Select the time division information (Y / U / V) to be extracted,
This time division information (Y / U / V) synchronization signal (Syuv)
And a video signal processing device that operates in at least two output modes out of a sixth output mode in which the output is performed together with.