KR950002472A - 인간의 시각특성을 이용한 디씨(dc) 변환계수 양자화기 - Google Patents

인간의 시각특성을 이용한 디씨(dc) 변환계수 양자화기 Download PDF

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KR950002472A
KR950002472A KR1019930010125A KR930010125A KR950002472A KR 950002472 A KR950002472 A KR 950002472A KR 1019930010125 A KR1019930010125 A KR 1019930010125A KR 930010125 A KR930010125 A KR 930010125A KR 950002472 A KR950002472 A KR 950002472A
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coefficient
step size
quantization step
intra
mode
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KR1019930010125A
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KR960010196B1 (ko
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김상호
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배순훈
대우전자 주식회사
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Priority to JP12282394A priority patent/JP3590421B2/ja
Priority to US08/253,516 priority patent/US5473377A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/18—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a set of transform coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • H04N19/126—Details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/157—Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
    • H04N19/159—Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H04N19/152—Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Image Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

본 발명은 디지틀 영상 부호화 장치의 양자화기에 관한 것으로, 신호의 밝기에 따른 인간의 시각특성을 이용하여 인트라모드 DC 변환계수를 적응적으로 양자화하는 양자화기에 관한 것이다. 본 발명에 따르면 인트라모드 DC 변환계수를 양자함에 있어서 기존의 고정된 양자화기를 사용하지 않고 인간의 시각특성에 따라 인트라모드의 DC 변환계수의 양자호 스텝크기를 결정한다. 따라서 영상신호의 인트라모드 DC 성분을 좀더 정밀하게 양자화할 수 있고, 이것으로 전송화질이 개선된다.

Description

인간의 시각특성을 이용한 디씨(DC) 변환계수 양자화기
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 인간의 시각특성을 설명하기 위한 도면, 제2도는 디지틀 영상 부호화 장치의 블록도, 제3도는 본 발명에 따른 양자화기의 블록도.

Claims (3)

  1. 디지틀 영상 부호화 장치에서, 전송버퍼의 상태 및 영상신호의 복잡도에 따라 결정되는 양자화 스텝크기에 따라서 DCT 변환계수를 양자화하기 위하여 입력되는 DCT 변환계수가 인터모드의 DC 및 AC 계수인 경우, 상기 양자화 스텝크기에 따라 상기 인터모드의 DC 및 AC 계수를 양자화하는 제1수단과; 입력되는 DCT 변환계수가 인트라모드의 AC 계수인 경우, 상기 양자화 스텝크기에 따라서 상기 인트라모드의 AC 계수를 양자화하는 제2수단을 가진 양자화기에 있어서, 입력되는 DCT 변환계수가 인트라모드의 DC 계수인 경우, 소정의 양자화 스탭크기에 따라서 상기 인트라모드의 DC 계수를 양자화하는 DC 계수 양자화수단과; 상기 DC 계수 양자화수단에 접속되며, 상기 DC 변환계수를 입력으로 하여 그 값에 대응하는 양자화 스텝크기를 제공하는 인트라모드의 DC 변환계수 양자화 스텝크기 결정수단을 더 포함하는 것을 특징으로 하는 양자화기.
  2. 제1항에 있어서, 상기 인트라모드의 DC 변환계수 양자화 스텝크기 결정수단 구획단위마다 새로운 DC 변환계수 양자화 스텝크기를 상기 DC 계수 양자화수단으로 제공하는 것을 특징으로 하는 양자화기.
  3. 제1항에 있어서, 상기 인트라모드의 DC 변환계수 양자화 스텝크기 결정수단은 거대구획단위마다 새로운 DC 변환계수 양자화 스텝크기를 상기 DC 계수 양자화수단으로 제공하는 것을 특징으로 하는 양자화기.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019930010125A 1993-06-04 1993-06-04 인간의 시각특성을 이용한 디씨(dc) 변환계수 양자화기 KR960010196B1 (ko)

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Application Number Priority Date Filing Date Title
KR1019930010125A KR960010196B1 (ko) 1993-06-04 1993-06-04 인간의 시각특성을 이용한 디씨(dc) 변환계수 양자화기
JP12282394A JP3590421B2 (ja) 1993-06-04 1994-06-03 イントラ−ブロックｄｃ変換係数量子化方法
US08/253,516 US5473377A (en) 1993-06-04 1994-06-03 Method for quantizing intra-block DC transform coefficients using the human visual characteristics

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KR1019930010125A KR960010196B1 (ko) 1993-06-04 1993-06-04 인간의 시각특성을 이용한 디씨(dc) 변환계수 양자화기

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KR960010196B1 (ko) 1996-07-26
JP3590421B2 (ja) 2004-11-17
US5473377A (en) 1995-12-05

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