KR970057939A

KR970057939A - Video encoding device

Info

Publication number: KR970057939A
Application number: KR1019950069146A
Authority: KR
Inventors: 이상일
Original assignee: 배순훈; 대우전자 주식회사
Priority date: 1995-12-30
Filing date: 1995-12-30
Publication date: 1997-07-31

Abstract

본 발명은 동영상 부호화장치에 관한 것으로서, 입력되는 소스영상을 프레임 단위로 저장하고, 휘도신호와 색신호로 분리하여 출력하는 제1프레임 메모리, 휘도신호와 색신호를 디지탈신호로 변환하는 아날로그/디지탈변환기, 디지탈 휘도신호와 디지탈 색신호에 대하여 움직임 보상된 이산 코사인 변환을 통해 각각 제1 및 제2양자화 스텝사이즈로 부호화하는 제1 및 제2영상부호하수단, 제1 및 제2영상 부호화수단, 제1 및 제2영상 부호화수단에서 부호화돈 휘도신호와 색신호에 대하여 소정의 부호를 이용하여 각 부호의 발생빈도에 따라 가변길이 부호화하는 가변길이 부호화부와, 가변길이 부호화부에서 출력되는 부호어들의 길이를 일정하게 조절하고 데이터 충만도에 따라 상기 제1 및 제2양자화 스텝사이즈를 조절하는 버퍼를 구비한다.따라서, 버퍼의 상태에 따라 Y신호와 C신호에 대하여 서로 다른 양자화 스텝사이즈를 설정해 줌으로써 윤곽선 등을 선명하게 양자화시킬 수 있어 화질을 높일 수 있는 이점이 있다.The present invention relates to a video encoding apparatus, comprising: a first frame memory for storing an input source image in frame units and separating and outputting the luminance signal and the color signal, and an analog / digital converter for converting the luminance signal and the color signal into a digital signal; First and second image encoding means, first and second image encoding means, and first and second image encoding means for encoding the first and second quantization step sizes, respectively, through motion-compensated discrete cosine transform on the digital luminance signal and the digital color signal. A variable length encoder for varying the length of the coded luminance signal and the color signal using a predetermined code according to the frequency of occurrence of each code, and a length of the codewords output from the variable length encoder And a buffer for adjusting the first and second quantization step sizes according to the data fullness. Set by giving a different quantization step size for the Y signal and the C signal in accordance with the state of the buffer it is possible to sharpen the contours such as quantization has the advantage to increase the image quality.

Description

Video encoding device

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

제1도는 일반적인 동영상 부호화장치를 나타낸 블럭도,1 is a block diagram showing a general video encoding apparatus,

제2도는 본 발명에 의한 동영상 부호화장치를 나타낸 블럭도.2 is a block diagram showing a video encoding apparatus according to the present invention.

Claims

A first frame memory 100 for storing the input source image in frame units and separating and outputting the input source image into a luminance signal and a color signal; An analog / digital converter 200 for converting a luminance signal and a color signal provided from the first frame memory into a digital signal; a first quantization step through motion-compensated discrete cosine transform on the luminance signal output from the analog / digital converter First video encoding means for encoding in size; Second image encoding means for encoding a color signal output from the analog / digital converter to a second quantization step size through motion compensated discrete cosine transform; A variable length encoder 130 for variable length encoding the luminance signal and the color signal encoded by the first and second image encoding means according to a frequency of occurrence of each code; And a buffer (140) for constantly adjusting the length of codewords output from the variable length encoder and adjusting the first and second quantization step sizes according to data fullness.

The video encoding apparatus of claim 1, wherein the buffer adjusts the first and second quantization step sizes to be small when the data fullness is low.

The video encoding apparatus of claim 1, wherein the buffer adjusts the first quantization step size to be small and the second quantization step size to be large when the data fullness is high.

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