KR960006595A

KR960006595A - Video signal compression device

Info

Publication number: KR960006595A
Application number: KR1019940018653A
Authority: KR
Inventors: 김진헌
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1994-07-29
Filing date: 1994-07-29
Publication date: 1996-02-23

Abstract

본 발명에 따른 영상신호 압축장치는 영상신호의 상관도에 따라서 다양한 스캔방향을 선택적으로 사용하므로서 보다 더 효율적으로 영상신호를 압축할 수 있다. 영상신호를 블럭단위로 입력받아, 이산 코사인 변환하여 얻어진 변환계수로 구성된 변환계수 블럭을 출력하는 이산 코사인 변환부와, 상기 이산 코사인 변환부로 부터 제공되는 변환계수 블럭을 양자화하여 출력하는 양자화부(100)와 기설정된 스캔방향을 입력받으며, 양자화부로 부터 제공되는 양자화된 데이타를 상기 스캔방향으로 스캔하여 가변길이 부호화하고, 그 결과로 얻어진 가변길이 부호화된 데이타를 출력하는 가변길이 부호화부(140)를 갖는 본 발명의 영상신호 압축장치는, 상기 양자화부(100)로 부터 제공되는 양자화 데이타 사이의 수평 및 수직 방향으로의 상관도를 조사하고, 보다 더 큰 상관도를 갖는 방향을 비교검출하여, 데이타 스캔방향 신호를 출력하는 스캔방향 결정부(120)와, 상기 스캔방향 결정부(120)로 부터 제공되는 스캔방향 신호를 가변길이 부호화하여 출력하는 스캔방향 부호화부(160)를 포함한다.The video signal compression apparatus according to the present invention can compress the video signal more efficiently by selectively using various scan directions according to the degree of correlation of the video signals. A discrete cosine transform unit for receiving a video signal in block units and outputting a transform coefficient block composed of transform coefficients obtained by discrete cosine transform, and a quantization unit 100 for quantizing and outputting a transform coefficient block provided from the discrete cosine transform unit. And variable length encoding by scanning the quantized data provided from the quantization unit in the scan direction and outputting the variable length encoded data. The video signal compression apparatus of the present invention has a correlation between horizontal and vertical directions between the quantized data provided from the quantization unit 100, and compares and detects a direction having a larger correlation. A scan direction determiner 120 for outputting a scan direction signal and a scan direction provided from the scan direction determiner 120 And a scan direction encoder 160 for outputting the variable length coded signal.

Description

Video signal compression device

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

도면은 본 발명에 따른 영상신호 압축장치의 동작을 도식적으로 설명하기 위한 블럭도.Figure is a block diagram for explaining the operation of the video signal compression apparatus according to the present invention.

Claims

A discrete cosine transform unit for receiving a video signal in block units and outputting a transform coefficient block composed of transform coefficients obtained by discrete cosine transform, and a quantization unit 100 for quantizing and outputting a transform coefficient block provided from the discrete cosine transform unit. And a variable length encoder that receives a preset scan direction, scans the quantized data provided from the quantizer in the scan direction, and outputs the variable length coded data. In the video signal compression apparatus having a 140, the correlation between the quantization data provided from the quantization unit 100 in the horizontal and vertical directions is examined, and the direction having the larger correlation is compared and detected. A scan direction determiner 120 for outputting a data scan direction signal; And a scan direction encoder (160) for variable length coding and outputting the scan direction signal provided from the scan direction determiner (120).

The method of claim 1, wherein the scan direction determiner 120 examines the correlation between the quantized data provided from the quantization unit 100 in the horizontal and vertical directions, and the correlation of the image signals in the horizontal direction. Outputs a horizontal scan direction signal when it is determined to be more dominant than the vertical direction, and in the opposite case, outputs a vertical scan direction signal, and the variable length encoder 140 responds to the horizontal scan direction signal. Variable length encoding by scanning the quantized data provided from the quantization unit 100 in the horizontal direction, and variable length encoding by scanning the quantized data in the vertical direction in response to the vertical scan direction signal Video signal compression device.

※ Note: The disclosure is based on the initial application.