KR950030673A

KR950030673A - Device for encoding video signal

Info

Publication number: KR950030673A
Application number: KR1019940009480A
Authority: KR
Inventors: 김진헌
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1994-04-30
Filing date: 1994-04-30
Publication date: 1995-11-24

Abstract

본 발명은 복원 오차를 감소시키기에 적합한 영상 신호를 부호화 하는 장치에 관한 것으로, 종래에는 전송률이 낮은 통신망을 사용하는 경우 이산 코사인 변환 및 양자화부의 양자화 스케일이 커지고 많은 부분이 부호화 되지 않으므로 이산 코사인 변환 및 양자화부에 인가되는 차이 영상 신호와 역 이산 코사인 변환 및 역 양자화부에서 출력되는 복원된 영상 신호의 오차가 커지게 되는 결점이 있었으나, 본 발명에서는 역이산 코사인 변환 및 역 양자화부(3)와 감산기 (4) 사이에 복원 오차 보상부(7)를 형성함으로써 양자화의 이산 코사인 변환에 따른 복원 오차를 보상함으로 그 양자화와 이산 코사인 변화에 따른 복원 오차가 감소되어 상기 결점을 개선시킬 수 있는 것이다.The present invention relates to an apparatus for encoding a video signal suitable for reducing a reconstruction error, and in the related art, when a communication network with a low data rate is used, a discrete cosine transform and a quantization scale of a quantization unit become larger and many portions are not encoded. The difference between the difference image signal applied to the quantizer and the inverse discrete cosine transform and the reconstructed image signal output from the inverse quantizer increases, but in the present invention, the inverse discrete cosine transform and inverse quantizer 3 and the subtractor are used. By forming a reconstruction error compensator (7) between (4) to compensate for the reconstruction error due to the discrete cosine transform of the quantization, the reconstruction error due to the quantization and the discrete cosine change can be reduced to improve the above defects.

Description

Device for encoding video signal

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도는 종래 기술에 따른 영상 신호를 부호화하는 장치의 일실시예를 나타낸 블럭도, 제2도는 본 발명에 따른 영상 신호를 부호화하는 장치의 일실시예를 나타낸 블럭도.1 is a block diagram showing an embodiment of an apparatus for encoding a video signal according to the prior art, and FIG. 2 is a block diagram showing an embodiment of an apparatus for encoding a video signal according to the present invention.

Claims

A subtractor 4 for outputting a difference signal between the image signal and the reconstruction error compensation signal; An adder (5) for adding the video signal and the output of the subtractor (4); A discrete cosine transform and quantizer (1) for discrete cosine transforming and quantizing the output of the adder (5); A switching unit (6) connected to the discrete cosine transform and quantization unit (1) to alternately output a signal in which a restoration error is compensated for and a signal in which the restoration error is not compensated; A buffer (2) for temporarily storing and outputting a signal compensated for by the restoration error of the switching unit (6); An inverse discrete cosine transform and inverse quantizer (3) for inverse quantization and inverse discrete cosine transforming a signal for which the restoration error of the switching unit is not compensated for; And a reconstruction error compensator (7) for reconstructing error compensation of the signals of the inverse discrete cosine transform and inverse quantizer (3) and applying them to the subtractor (4).

An apparatus according to claim 1, wherein said switching unit (6) encodes an image signal of a demultiplexer.

※ Note: This is to be disclosed by the original application.