JPH03139978A - Image signal processing system - Google Patents

Abstract

PURPOSE:To properly use two kinds of processors and to connect one selected processor to a general image signal processor by connecting an image signal processor between an RGB processor and a YC processor as a common interface. CONSTITUTION:The YC processor 4 converts an input video signal into a YC signal consisting of a luminance signal Y and color difference signals Cr, Cb, image compression/extension is applied to the converted YC signal and a natural image is displayed by a VRAM 42 corresponding to respective signals Y, Cr, Cb. The YC signal output is converted into an RGB signal and outputted. The image signal processor 1 is constituted so as to be used in common as an interface between the YC processor 4 and the RGB processor 3. Since both the processors 3, 4 are properly used in accordance with a purpose, the performance of the image signal processor 1 can be improved.

Description

[Detailed Description of the Invention] [Summary] Regarding an image signal processing method in an image signal processing device such as a personal computer, it is an object of the present invention to provide an image signal processing method that can be used with both an RGB processing device and a YC processing device. , R converts the input video signal into an RGB signal consisting of color signals R, G, and B.
In an image signal processing device having a GB processing device and an image related processing device that displays a natural image using a natural image VRAM consisting of a VRAM corresponding to color signals RG and B, an input video signal is converted into a luminance signal Y22 a color difference signal Cr, A YC signal generation unit that converts Cb into a YC signal, and an input YC
A luminance signal Y is obtained by performing image compression/expansion on the signal.

A natural image VRAM that displays a natural image using VRAMs corresponding to color difference signals Cr and Cb, and a natural image VRAM
A YC/RGB conversion section that converts the YC signal output of the YC signal into an RGB signal is provided, and a YC processing device that shares an interface with the RGB processing device is provided, and can be used for both the RGB processing device and the YC processing device. It is made up of things like this.

[Industrial application field]

The present invention relates to an image signal processing method in an image signal processing device such as a personal computer.

The ROB processing device converts the image from the external image output device into a color signal R.
, G, B for displaying moving images, or for displaying still natural images by writing them into a still image memory in an uncompressed manner, and is for stand-alone use.
It has the advantage of being low priced.

The YC processing device also processes the luminance signal Y22 color difference signals Cr and Cb.
- It has the function of compressing/expanding image data in addition to the functions of a conventional image processing device, and is capable of communicating compressed data, and is suitable for network use, but is expensive. It is.

An image signal processing device such as a personal computer needs to be able to be used by connecting with both an RGB processing device and a YC processing device. There is a need for an image signal processing method that can share an interface with processing devices.

[Prior Art] Fig. 4 shows the configuration of a conventional image signal processing device, illustrating the case of a personal computer, where 1 is a general image-related processing device in a personal computer, and 2 is an image-related processing device. 1
3 is an RGB processing device.

The RGB processing device 3 includes an RGB conversion section 31 and an analog/digital (A/D) conversion section 32.

The RGB conversion unit 31 converts a video signal made of an NTSC composite signal from an external image output device into an RGB signal made of analog color signals R, G, and B, and outputs the converted signal. The A/D converter 32 performs analog/digital conversion on the analog RGB signal from the RGB converter 31, generates an output signal consisting of a digital RGB signal, and sends it to the personal computer.

The image-related processing device 1 on the personal computer side includes a natural image video memory (VRAM) 11, a composition section 12, and a digital/analog (D/A) conversion section 13.

The natural image VRAM II has a VRAM corresponding to each of the color signals R, G, and B, and processes natural image data of RGB signals consisting of digital signals from the RGB processing device 3 into corresponding color signals R, G, and B. The images are stored uncompressed in separate VRAMs, and at this time, screen processing such as framing and window opening is performed to create still natural image information.

The synthesizing unit 12 synthesizes the natural image signal read from the natural image VRAM 1l and the moving image signal from the RGB processing device 3, and outputs a synthesized image signal made of digital RGB signals. The D/A converter 13 converts this combined image signal into an analog signal and outputs it.

The monitor 2 displays an image synthesized from a natural image and a moving image using this RGB image signal.

[Problem that the invention attempts to solve]

2. Description of the Related Art Conventional image signal processing devices in personal computers and the like convert video signals into RGB signals and display natural images and moving images.

This is because computers have memory in RGB units.
This is based on the fact that the stand-alone display system is an RGB signal system. In addition, data processing using RGB signals is
This is also due to the fact that the circuit is simple.

On the other hand, when processing image data compression/expansion,
In terms of data quality and compression efficiency, data processing using the YC method using the luminance signal Y1 and color difference signals Cr and Cb is more efficient than data processing using the RGB method using the color signals R, G, and B. It is known.

However, as mentioned above, conventional image signal processing devices
It is configured to process images using RGB signals.

Therefore, when connecting a YC processing device that performs YC image processing to a personal computer, etc., the interface between this and the image signal processing device must be performed using RGB signals.
Conventionally, such an image signal processing method was unknown.

The present invention aims to solve the problems of the prior art as described above, and by making an interface common between the RGB processing device and the YC processing device in an image signal processing device, the RGB processing device and the YC processing device can be The object of the present invention is to provide an image signal processing method that can be used with any processing device.

[Means for Solving the Problems] As shown in FIG. 1, the basic configuration of the present invention is as follows: In an image signal processing device having an image related processing device 1 that displays a natural image using a natural image VRAM consisting of a VRAM corresponding to Shingetsu R1G and B, a YC processing device 4 is provided, and an RGB processing device 3 and a YC processing device are provided. It can be used for any of 4.

YC processing device 4 is a YCC signal generation type 41, natural image VRA
M42, and a Y C/RG B conversion section 43,
The interface is shared with the B processing device 3.

Here, the YCC signal generation type 41 converts the input video signal into a YC signal consisting of a consistency signal Y9 color difference signals Cr and Cb, and the natural image VRAM 42 performs image compression/expansion on the input YC signal to generate a luminance signal. Y.

A natural image is displayed by VRAM corresponding to each of the color difference signals Cr and Cb, and the YC/RGB conversion section 43 converts the VC signal output of the natural image VRAM 42 into an RGB signal.

(Function) In conventional image signal processing devices such as personal computers, RG
It has a B processing device and an image-related processing device, converts an input video signal into an RGB signal consisting of color signals R, G, and B, and converts the color signals R, G, and B into a natural image consisting of a VRAM corresponding to each. By writing to VRAM in an uncompressed manner, natural images and moving images can be displayed.

In the present invention, such an image signal processing device is capable of displaying a natural image that has been subjected to image compression/expansion processing using a YC processing device.

The YC processing device converts the input video signal into a luminance signal Y.

The color difference signals Cr and Cb are converted into a YC signal, which is then subjected to image compression/expansion to produce a luminance signal Y1 and a color difference signal Cr and C.
A natural image can be displayed using the VRAMs corresponding to each of the elements b, and the YC signal output can be converted into an RGB signal and output, and the interface can be shared with the RGB processing device.

Therefore, according to the present invention, in the image signal processing device,
It becomes possible to use the RGB processing device and the YC processing device differently depending on the purpose, and it becomes possible to improve the performance of the image signal processing device.

(Embodiment) FIG. 2 is a diagram showing the configuration of an embodiment of the present invention,
C processing device 4 is shown.

The YC processing device 4 includes a YCC signal generation type 41, a natural image VR
It consists of an AM 42 and a YC/RGB conversion section 43.

YCC signal generation type 41 converts a video signal consisting of an NTSC composite signal from an external image output device into a YC signal consisting of a luminance signal Y1 and color difference signals Cr and Cb and outputs the converted signal.

The natural image VRAM 42 has a luminance signal Y00 and a color difference signal Cr, C.
It has a VRAM corresponding to each of the YCC signal generation types 41 and VC signals as a luminance signal Y.

The color difference signals Cr and Cb are stored in respective VRAMs in correspondence with each other. At this time, based on control from a control unit (not shown), image compression/expansion processing is performed on each of the luminance signal Y2 and color difference signals Cr and Cb, and the fJ signal is stored in each VRAM. It is configured so that it can be done.

The Y C/RG B conversion unit 43 converts the YC signal consisting of the luminance signal Y1 and the color difference signals Cr and Cb read from the natural image VRAM 42 into an RGB signal consisting of nine color signals R, G, and B, and outputs the converted signal. do.

FIG. 3 shows an example of the configuration of an image signal processing device to which the present invention is applied, and an example is shown for a personal computer, where 1 is a general image-related processing device for a personal computer,
A path connection is made to a personal computer (not shown). 2 is a monitor for displaying an output image of the image-related processing device 1; 4
is a YC processing device, which is configured so that it can be connected to the image-related processing device 1 in place of the RGB processing device 3 shown in FIG. 4 by switching a switch or replacing a board.

The YC processing device 4 includes a YC signal generation unit 4], a natural image VRA
M42. It consists of a YC/RGB conversion section 43 and an analog/digital (A/D) conversion section 44.

YCC signal generation type 41 converts a video signal consisting of an NTSC composite signal from an external image output device into a YC signal, which is an analog signal consisting of three types of signals: a luminance signal Y1, color difference signals Cr and Cb, and outputs it.

The A/D converter 44 converts the YCC signal generation type 41 luminance signal Y
VC signal outputs consisting of one color difference signals Cr and Cb are each converted into digital signals and output.

In the natural image VRAM 42, the output signal of the A/D converter 44 is processed in real time by the main bus signal on the personal computer side, and image compression/expansion processing is performed, so that the luminance signal Y1 and the color difference signals Cr and Cb correspond to each other. VRA
Store in M.

The Y C/RG B conversion unit 43 converts the YC signal consisting of the luminance signal Y1 and the color difference signals Cr and Cb read from the natural image VRAM 42 into an RGB signal consisting of the color signals R, G, and B, and outputs the converted signal. .

As a result, the image-related processing device 1 performs the same processing as described with reference to FIG. 4, and outputs a composite image signal made of analog signals.

That is, in the natural image VRAM II, natural image data of RGB signals consisting of digital signals from the YC processing device 4 are processed into respective VRAs corresponding to color signals R, G, and B.
At the same time, screen processing such as framing and window opening is performed. In the synthesis unit 12, the natural image signal read from the natural image VRAMII and the YC
It combines the natural image signal from the processing device 4 and outputs a composite image signal consisting of digital RGB signals. The D/A converter 13 converts this combined image signal into an analog signal and outputs it.

The monitor 2 displays the combined image using the image signal from the D/A converter 13.

As mentioned above, the YC processing device 4 can be replaced with the RGB processing device 3, and since the image processing device has a common interface, both devices can be connected to the image-related processing device l, and the computer On the side, RG
It becomes possible to use the B processing device and the YC processing device depending on the purpose.

〔Effect of the invention〕

As explained above, according to the present invention, since the interface between the RGB processing device and the YC processing device is made common to the image signal processing device, two types of devices can be used separately.
- It becomes possible to connect to a G-type image signal processing device, and therefore greatly contributes to improving the performance of the image signal processing device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a diagram showing an example configuration of an image signal processing device to which the present invention is applied. FIG. 4 is a diagram showing the configuration of a conventional image signal processing device. 1 is an image-related processing device, 3 is an RGB processing device, 4 is a YC
Processing device, 41 is a YC signal generation unit, 42 is a natural image VRA
M, 43 is a YC/RGB conversion section.

Claims (1)

[Scope of Claims] A natural image VRAM comprising an RGB processing device (3) that converts an input video signal into an RGB signal consisting of color signals R, G, and B, and a VRAM that corresponds to each of the color signals R, G, and B. an image-related processing device (1) for displaying a natural image using a YC signal generation unit (41) that converts an input video signal into a YC signal consisting of a luminance signal Y, color difference signals Cr and Cb; A natural image VRAM (42) that compresses/expands an input YC signal and displays a natural image using a VRAM corresponding to each of the luminance signal Y, color difference signals Cr and Cb, and the natural image VR.
Y that converts the YC signal output of AM (42) into an RGB signal
a YC processing device (4) having a C/RGB conversion section (43) and sharing an interface with the RGB processing device (3);
), and can be used for both an RGB processing device (3) and a YC processing device (4).