KR20000072058A - The system, doing compression process of video signal in the middle of image generation process. - Google Patents

Abstract

PURPOSE: A compressing apparatus in signal processing for forming an image is provided to increase a compression efficiency of an image signal, thereby reducing a cost of transmitting and storing a signal. CONSTITUTION: The compressing apparatus in signal processing for forming an image comprises an imaging portion(7) for converting a light signal into an electric signal, a former processing portion(8) for partially image-processing the electric signal to increase a compression efficiency of a compressing portion, a compressing portion(9) for compressing the signal from the former processing portion, a transmitting and storing portion(10) for transmitting or storing the signal according to an application of the system, a restoring portion(11) for always or selectively restoring the signal, a latter processing portion(12) for completely image-processing the signal to generate a complete image signal, and a reproducing portion(13) for reproducing the image signal from the latter processing portion. In the apparatus, the reproducing portion is a monitor or a LCD(liquid crystal display).

Description

A device that performs a compression process during signal processing for image generation. {The system, doing compression process of video signal in the middle of image generation process. }

1. Technical Field

Device that generates, compresses, stores and transmits image signals

-DVR (Digital Video Recorder: "Digital Video Storage")

Video conferencing and video telephony systems (eg IMT2000)

-DSC (Digital Still Camera)

-CCTV Camera and Web Camera

2. Prior art

As shown in Fig. 1, when the " imager " of 1) converts a light signal into an electrical signal using a CCD or CMOS, etc., the " image processing unit " It is then placed into a complete image signal, compressed, stored and transmitted.

2) "Image processing part" is usually "BLACK LEVEL adjustment", "noise removal", "COLOR GAIN adjustment", "GAMMA conversion", "color conversion and interpolation", "Pixel ) It consists of various elements such as "Interpolation", "Contour Correction", and performs various processes to generate an image and obtain good image quality.

3. Problems of the prior art

However, in such an image processing process, it is helpful for image generation or image quality improvement, but there are many factors that reduce compression efficiency. For example, the "contour correction unit" generates a high frequency component to reduce the "correlation" of the image information and increase the amount of information.

Compression reduces the amount of information by using a "correlation" between a large amount of image information and is a very important factor in an "image communication device" and a storage device. The compression method up to now has achieved a lot of results, but all of them have the limitation of efficiency because they are targeted for the image that has completed the image processing.

In addition, in the case of the "DVR system", the image processing is always performed even for an image that does not need to be reproduced, thereby increasing the cost of the input device.

1. Higher compression efficiency of image signal reduces high-speed transmission and transmission cost when transmitting, and reduces storage device cost when storing.

2. Dividing the "image signal processor" into two, the input device is equipped with only the "preprocessor" to reduce the cost of the input device.

1. FIG. 1: Completion, compression, transmission, storage and reconstruction of a complete image after completion of signal generation for image generation in the prior art.

2. FIG. 2: Performs only "image signal processing (preprocessing)" useful for compression with the present invention first, and then compresses, transmits or stores the unfinished image signal, and restores and rests "post-processing" on the receiving side. Perform

3. FIG. 3: In the embodiment of the present invention [FIG. 2], "contour correction part" is placed in "post-processing" among various processes of signal processing for image generation.

4. Fig. 4: The " relay " is simple with the " image telephone system " using the prior art, but the " image processing section "

5. Fig. 5 is a "video telephone system" using the present invention, the compression efficiency is high, high-speed transmission is possible.

6. Fig. 6: "DVR (DIGITAL VIDEO RECORDER: Digital Image Storage System)" using the present invention, the input device such as a CCTV camera contains only a "pre-processing part", so it is simple and the compression efficiency is stored. The cost is reduced.

See FIG. 2

The role of each part will be described sequentially.

The "imager" of 7) combines the lens with CCD and CMOS to convert the light signal into an electrical signal.

The "pre-processing part" of 8) of the "image processing part" arranges only the element which can improve a compression efficiency, and makes a "compression part" have high compression efficiency.

The "compressor" of 9) compresses the signal partially imaged by the "preprocessor" and then transmits or stores it in 10) according to the purpose of the system.

In the case of the receiving side, the " recovery unit " of 11) always restores, and the DVR selectively restores as necessary.

In the " image processing unit ", the " post processing unit " of 12) does not place a burden on the compression unit in 9) by arranging elements that reduce the compression efficiency. It is displayed on the "playback section" (monitor and LCD).

FIG. 3 is an embodiment of FIG. 2, in which "contour correction" in 19) generates a lot of high frequency components to increase the amount of information and requires more than two lines of "line memory" for implementation. Placing this "contour correction" behind the "compression section" improves compression efficiency and reduces the cost of "line memory" for input devices.

FIG. 4 is a concept of a "picture telephone system" of the prior art as in FIG.

In the case of FIG. 5, the compression efficiency is increased with the "video telephone system" to which the concept of FIG.

If only the pre-processing unit is placed in the terminal and the post-processing unit such as 23) and 24 is installed in the repeater instead of the terminal, the compression efficiency of the receiver decreases and the repeater Is somewhat complicated, but "time division processing" with one "repeater" can handle multiple "terminals", so the "terminal" price can be economical.

6 shows the configuration of the "DVR system" using the present invention.

Conventional systems have 31) and this part is included in 27).

In FIG. 6, likewise, the compression efficiency is not only increased by 27) but also the cost of the "image generator" is reduced because it does not include the part 31). In the case of DVR, it is economical because it restores and plays back the recorded video only when necessary, and supports multiple input devices ("image generator") as one.

1. The compression efficiency of the image signal is higher, which enables high-speed transmission and reduces the transmission cost.

2. Higher image signal compression efficiency reduces storage cost.

3. If the image signal processing section is separated and reproduced, "post-processing" is necessary, and only acquisition is performed, "pre-processing" can be performed, thereby reducing the cost of the input device.

Claims (2)

As shown in Fig. 2, the "image processing part" for image signal generation is divided into the "pre-processing part" of 8) which improves the compression efficiency and the "post-processing part" of 12) which reduces the compression efficiency, A device which performs only "preprocessing" first to compress, transmit or store an unfinished image signal, and performs "postprocessing" upon reception and reproduction to reproduce a completed image signal. In order to improve the compression efficiency, as shown in FIG. 3, the "contour compensator" which is a component of the "image processing part" for image signal generation is placed after the "compression part" of 16) and "transmission and storage part" of 17). device.