KR940001728A - 디지탈 화상신호 전송장치 - Google Patents

디지탈 화상신호 전송장치 Download PDF

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KR940001728A
KR940001728A KR1019930011561A KR930011561A KR940001728A KR 940001728 A KR940001728 A KR 940001728A KR 1019930011561 A KR1019930011561 A KR 1019930011561A KR 930011561 A KR930011561 A KR 930011561A KR 940001728 A KR940001728 A KR 940001728A
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image signal
digital image
block
quantization
activity
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KR100299202B1 (ko
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나오후미 야나기하라
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오오가 노리오
소니 가부시끼 가이샤
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Abstract

〔목적〕
블록 마다에 액티비티를 클라스 분할하여, 이 액티비티 클라스에 대응한 양자화를 실행하는 것이 가능하다.
〔구성〕
DCT에서 발생한 교류분의 계수 데이타가 액티비티 검출회로(8)에 제공된다. 1블록의 데이타 게수중에서, 엣지 정보가 있을 때 발생하는 에어리어를 제거하여 비교적 고감의 계수 데이타가 절대값 TH1와 비교된다. 1블록마다 절대값 TH1 이상의 계수 데이타의 갯수 NH가 카운터(27)에서 계수된다. 그 계수값 NH이 비교회로(29. 30, 31)에서 각각의 절대값 TH3, TH4, TH5와 비교되며, 그 비교 결과가 로직(33)에 제공되며, 블록(33)에서 액티비티 클라스를 표시하는 코드 AT가 발생한다. 그 액티비티 클라스에 대응하여 양자화 스텝의 조가 설정되며, 액티비티가 높으면 양자화가 거칠어지며, 이것이 낮으면 양자화는 섬세하다.

Description

디지탈 화상신호 전송장치
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명이 적용된 디지탈 VTR의 기록 데이타 터리 회로 블록도.
제2도는 마크로블록 설명에 사용하는 도시도.
제3도는 DCT계수 데이타 출력 순서의 일예를 나타내는 도시도.
제4도는 필드내 DCT의 처리를 나타내는 도시도.
제5도는 기록 데이타의 싱크 블록 구성을 나타내는 도시도.
제6도는 양자화에서 의 둥근 처리의 설명을 위한 도시도.
제7도는 액티비티 검출 회로 일예의 블록도.
제8도는 액티비티 검출 에어리어를 나타내는 도시도.
제9도는 액티비티 검출을 설명하기 위한 도시도.
제10도는 DCT에거 발생하는 계수를 설명하기 위한 도시도.
제11도는 견적기 일례의 블록도.

Claims (5)

  1. 디지탈 화상 신호를 직교 변환 및 가변장부호로 부호화하고 상기 부호화 출력을 전송하도록한 디지탈 화상 신호 전송 장치에 있어서, 상기 디지탈 화상 신호를 소정의 블록 구조에 변환하기 위한 블록화 수단과, 상기 블록화 수단과 결합되고 상기 디지탈 화상 신호 블록마다 직교 변환을 행하기 위한 직교 변환 수단과 상기 직교 변환 수단으로부터의 교류분 데이타가 공급되고 상기 블록마다 액티비티를 검출하는 수단으로서 상기 교류분 데이타의 비교적 고역의 복수 데이타의 절대값을 복수 문턱값과 비교하므로써 액티비티를 클라스 분할하는 수단과, 상기 직교 교환 수단으로부터의 데이타를 양자화하기 위한 수단과, 상기 양자화 수단과 결합되고 상기 액티비티 클라스에 적응하여 양자화스텝을 제어하기 위한 제어 수단과, 상기 양자화수단 출력이 공급되는 가변상 부호화 수단으로된 디지탈 화상 신호 전송 장치.
  2. 디지탈 화상 신호를 직교 변환 및 가변장부호로 부호화하고 상기 부호화 출력을 전송하도록한 디지탈 화상 신호 전송 장치에 있어서, 상기 디지탈 화상 신호를 소정의 블록 구조로 변환하기 위한 블록화 수단과, 상기 블록화 수단과 결합되고 상기 디지탈 화상 신호 블록마다 직교 변환을 하기 위한 직교 변환 수단과, 상기 직교 변환 수단으로부터의 교류분 데이타가 공급되고 상기 블록마다 액티비티를 검출하는 수단으로서 상기 교류분 데이타의 비교적 고역의 복수 데이타의 절대값을 복수 문턱 값과 비교하므로써 액티비티를 클라스 나눔하고 또한 모든 상기 교류분 데이타의 절대값과 상기 복수의 문턱값 보다도 충분히 큰 문턱값을 비교하여 상기 큰 문턱값을 초과하는 것은 가장 액티비티가 높은 클라스로 하기 위한 수단과. 소정 기간 데이타량이 소정값 이하가 되도록 상기 직교 변환 수단으로부터의 데이타량을 양자화하기 위한 수단과, 상기 양자화수단과 결합되고 상기 액티비티 클라스에 적응하여 양자화 스텝을 제어하기 위한 제어 수단과, 상기 양자화 수단 출력이 공급되는 가변상부호화 수단으로 된 디지탈 화상 신호 전송 장치.
  3. 제1항 또는 2항에 있어서, 상기 양자화 수단은 양자화 스텝폭이 서로 다른 복수의 양자화 스텝에서 상기 제어 수단으로 선택된 것으로 상기 직교 변환 수단 출력을 양자화하고 상기 액티비티 클라스에 응답하여 상기 양자화 스텝이 변경되는 것을 특징으로 하는 디지탈 화상 신호 전송 장치.
  4. 제1항 또는 2항에 있어서, 상기 제어 수단은 상기 직교 변환 수단의 각 출력의 블록 배열 위치에 따라 상기 양자화 스텝을 변경하는 에어리어 제어를 하고, 또 색신호에 관하여 상기 액티비티 클라스에 응답하여 상기 에이리어 제어가 변경되는 것을 특징으로 하는 디지탈 화상 신호 전송 장치
  5. 제1항 또는 2항에 있어서, 상기 양자화 수단은 상기 직교 변환 수단 출력의 문턱값에 대한 대소 관계에 따라 사사오입 처리가 변경되는 것을 특징으로 하는 디지탈 화상 신호 전송 장치.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019930011561A 1992-06-30 1993-06-24 디지털 화상 신호 처리장치 및 처리방법 KR100299202B1 (ko)

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JP19622092A JP3245977B2 (ja) 1992-06-30 1992-06-30 ディジタル画像信号の伝送装置
CH92-196220 1992-06-30
JP92-196220 1992-06-30

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KR100299202B1 (ko) 2001-10-22
JPH0622292A (ja) 1994-01-28
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