KR970073139A - IMPROVED IMAGE CODING SYSTEM HAVING FUNCTIONS FOR CONTROLLING GENERATED AMOUNT OF CODED BIT STREEM - Google Patents

IMPROVED IMAGE CODING SYSTEM HAVING FUNCTIONS FOR CONTROLLING GENERATED AMOUNT OF CODED BIT STREEM Download PDF

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KR970073139A
KR970073139A KR1019960013786A KR19960013786A KR970073139A KR 970073139 A KR970073139 A KR 970073139A KR 1019960013786 A KR1019960013786 A KR 1019960013786A KR 19960013786 A KR19960013786 A KR 19960013786A KR 970073139 A KR970073139 A KR 970073139A
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current frame
encoding
filter coefficient
coefficient determination
signal
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KR1019960013786A
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KR100203678B1 (en
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김종일
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배순훈
대우전자 주식회사
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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
    • H04N19/134—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
    • H04N19/136—Incoming video signal characteristics or properties
    • H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
    • H04N19/139—Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
    • 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
    • H04N19/102—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
    • H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • 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
    • H04N19/625—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]
    • 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
    • H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation

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

Abstract

본 발명은, MC-DCT 양자화를 포함하는 부호화 시스템에 있어서, 움직임 추정 및 보상을 위해 복원된 이전 프레임의 공간 복잡도에 근거하여 현재 부호화하고자 하는 영상의 복잡도를 산출하고, 그 산출결과에 따라 2차원 저역 통과 필터를 이용하여 입력 영상신호의 고주파 성분을 선택적으로 제거함으로써, 부호화후의 비트 발생량을 적응적으로 조절할 수 있도록 한 비트 발생량 조절기능을 갖는 영상 부호화 시스템에 관한 것으로, 이를 위하여 본 발명은, 움직임 추정, 보상을 위해 복원된 이전 프레임 각각에 부호화 시스템에 관한 것으로 이를 위하여 본 발명은 움직임 추정 보상을 위행 복원된 이전 프레임 각각에 대해 공간 복잡도값을 산출하고 각각 산출된 각 이전 프레임의 공간 복잡도값들을 평균하여 기설정된 복수의 이전 프레임에 대한 평균 공간 복잡도값을 산출하는 공간 복잡도 계산 수단; 산출된 복수의 프레임의 평균 공간 복잡도값을 DCT 양자화 및 엔트로피 부호화를 갖는 부호화 수단을 통해 현재 부호화하고자 하는 프레임의 복잡도로서 참조하며 부호화를 위해 입력되는 현재 프레임의 주파수 통과대역폭을 적응적으로 제한 하기 위한 기설정된 복수의 필터계수 결정신호들 중 산출된 평균 공가 복잡도값에 대응하는 필터계수 결정신호를 발생하는 제어수단: 및 발생된 필터계수 결정신호에 의거하여 입력되는 현재 프레임을 움직임 추정, 보상을 위한 현재 프레임 신호로써 부호화 수단에 필터링 없이 제공하거나 복수의 필터계수중 발생된 필터계수 결정신호에 따라 결정된 필터계수에 의거하여 입력 현재 프레임 신호에 2차원 저역 통과 필터링을 선택적으로 적용하여 그통과 대역을 제한함으로써 고주파 성분을 제거한 프레임 신호를 움직인 추정, 보상을 위한 현재 프레임 신호로써 부호후 수단에 제공하는 2차원 저역 통과 필터링 수단을 포함함으로써, 부호화 수단에서의 양자화시 과도한 스텝 사이즈의 증가없이 부호화후 발생되는 비트량을 효과적으로 조절할 수 있는 것이다.According to the present invention, in an encoding system including MC-DCT quantization, a complexity of an image to be currently encoded is calculated based on spatial complexity of a previous frame reconstructed for motion estimation and compensation, The present invention relates to an image encoding system having a bit generation amount adjustment function for selectively removing high frequency components of an input image signal using a low pass filter to adaptively adjust a bit generation amount after encoding. The present invention relates to a coding system in each of previous frames reconstructed for estimation and compensation. To this end, the present invention calculates a spatial complexity value for each of the previous frames reconstructed from motion compensation and compensates for spatial complexity values The average of a plurality of previous frames Space complexity calculation means for calculating a complexity value between; The average spatial complexity value of the calculated plurality of frames is referred to as a complexity of a current frame to be encoded through encoding means having DCT quantization and entropy encoding and the adaptation to the frequency pass bandwidth of the current frame inputted for encoding A control unit for generating a filter coefficient determination signal corresponding to the calculated average bother complexity value among a plurality of predetermined filter coefficient determination signals; and a control unit for generating a current frame, which is input based on the generated filter coefficient determination signal, Dimensional low-pass filtering is selectively applied to an input current frame signal based on a filter coefficient determined according to a filter coefficient determination signal generated from a plurality of filter coefficients or provided as a current frame signal to the encoding means without filtering, Thereby removing the high frequency component Dimensional low-pass filtering means for providing a current frame signal for estimation and compensation for moving the quantized bit stream to the encoding means so that the amount of bits generated after encoding can be effectively adjusted without increasing the step size excessively at the time of quantization in the encoding means It is.

Description

비트 발생량 조절기능을 갖는 영상 부호화 시스템(IMPROVED IMAGE CODING SYSTEM HAVING FUNCTIONS FOR CONTROLLING GENERATED AMOUNT OF CODED BIT STREEM)IMPROVED IMAGE CODING SYSTEM HAVING FUNCTIONS FOR CONTROLLING GENERATED AMOUNT OF CODED BIT STREEM

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제 1도는 본 발명의 바람직한 실시예에 따른 비트 발생량 조절기능을 갖는 영상 부호화 시스템의 블록구성도.BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an image encoding system having a bit generation amount adjustment function according to a preferred embodiment of the present invention; FIG.

Claims (5)

입력되는 현재 프레임과, 이 현재 프레임 및 재구성된 이전 프레임을 이용하는 매크로 블록단위의 움직임 추정, 보상을 통해 얻어지는 예측 프레임간의 에러신호에 대해 이산 코사인 변환 양자화 및 엔트로피 부호화를 포함하는 부호화 수단을 통해 압축 부호화하여 부호화된 비트 스트림을 발생하며, 상기 양자화는 출력측 버퍼에 저장되는 상기 비트 스트림의 충만상태 정보에 의거하여 그 스켑 사이즈가 조절되는 비트 발생량 조절기능을 갖는 영상부호화 시스템에 있어서, 상기 움직임 추정, 보상을 위해 복원된 상기 이전 프레임 각각에 대해 공간 복잡도값을 산출하고, 각각 산출된 상기 각 이전 프레임의 공간 복잡도값들을 평균하여 기설정된 복수의 이전 프레임에 대한 평균 공간 복잡도값을 산출하는 공간 복잡도 계산 수단; 상기 산출된 복수의 복수의 프레임의 평균 공간 복잡도값을 상기 부호화 수단을 통해 현재 부호화하고자 하는 프레임의 복잡도로서 참조하며 부호화를 위해 입력되는 상기 현재 프레임의 주파수 통과 대역폭을 적응적으로 제한하기 위한 기설정된 복수의 필터계수 결정 신호들중 상기 산출된 평균 공간 복잡도값에 대응하는 필터계수 결정신호를 발생하는 제어수단; 및 상기 발생된 필터계수 결정신호에 의거하여 상기 입력되는 현재 프레임을 상기 움직임 추정, 보상을 위한 현재 프레임 신호로써 상기 부호화 수단에 필터링없이 제공하거나 복수의 필터계수중 상기 발생되 필터계수 결정신호에 따라 결정된 필터계수에 의거하여 상기 입력 현재프레임 신호에 2차원 저역 통과 필터링을 선택적으로 적용하여 그 통과 대역을 제한함으로써 고주파 성분을 제거한 프레임 신호를 상기 움직임 추정, 보상을 위한 현재 프레임 신호로써 상기 부호화 수단에 제공하는 2 차원 저역 통과 필터링 수단을 더 포함하는 것을 특징으로 하는 비트 발생량 조절기능을 갖는 영상 부호화 시스템And an error signal between predictive frames obtained through motion estimation and compensation of a current macroblock unit using the present frame and the reconstructed previous frame is encoded through encoding means including discrete cosine transform quantization and entropy encoding, And generating a coded bit stream, wherein the quantization comprises a bit generation amount adjustment function that scune size is adjusted based on fullness state information of the bitstream stored in an output side buffer, the system comprising: Calculating a spatial complexity value for each of the previous frames restored for the previous frame and averaging the calculated spatial complexity values of the previous frames, ; And an average spatial complexity value of a plurality of the calculated plurality of frames is referred to as a complexity of a current frame to be encoded through the encoding means and is set in advance for adaptively limiting a frequency passband bandwidth of the current frame inputted for encoding Control means for generating a filter coefficient determination signal corresponding to the calculated average spatial complexity value among the plurality of filter coefficient determination signals; And providing the current frame as the current frame signal for the motion estimation and compensation without filtering to the encoding means based on the generated filter coefficient determination signal, A low-frequency component removed frame signal is applied to the encoding means as a current frame signal for motion estimation and compensation by selectively applying two-dimensional low-pass filtering to the input current frame signal based on a filter coefficient, Dimensional low-pass filtering means for performing a bit-amount modulation 제 1항에 있어서, 상기 기설정된 각 필터계수 결정신호는 상기 산출된 각 이전 프레임의 공간 복잡도값 상기각 프레임의 공간 복잡도값을 평균하여 얻은 초당 전송되는 복수의 프레임에 대한 평균 에러치 및 이 평균 에러치의 표준편차를 이용하여 결정되는 것을 특징으로 하는 비트 발생량 조절기능을 갖는 영상 부호화 시스템2. The method of claim 1, wherein the predetermined filter coefficient determination signal includes a spatial complexity value of each of the calculated previous frames, an average error value of a plurality of frames transmitted per second obtained by averaging spatial complexity values of the respective frames, Wherein the bit error rate is determined using a standard deviation of the error value. 제 1항 또는 제 2항에 있어서, 상기 기설정된 복수의 각 필터계수 결정신호는, 상기 현재 프레임 신호의 각 블록들의 선택적인 대역폭 제한을 위해 각각 다른 정수값을 갖는 4개의 필터계수 결정신호를 포함하는 것을 특징으로 하는 비트 발생량 조절기능을 갖는 영상 부호화 시스템.The method of claim 1 or 2, wherein the predetermined plurality of filter coefficient determination signals include four filter coefficient determination signals having different integer values for selective bandwidth limitation of each block of the current frame signal Wherein the image coding system has a bit generation amount adjustment function. 제 3항에 있어서, 상기 각 필터계수는 3×3의 차수를 갖는 것을 특징으로 하는 비트 발생량 조절기능을 갖는 영상 부호화 시스템4. The image encoding system according to claim 3, wherein each of the filter coefficients has a degree of 3 x 3 제 1항에 있어서, 상기 현재 프레임에 대한 2차원 저역 통과 필터링은 8×8블록 단위로 수행되는 것을 특징으로 하는 비트 발생량 조절기능을 갖는 영상 부호화 시스템2. The image encoding system according to claim 1, wherein the two-dimensional low-pass filtering for the current frame is performed in 8x8 block units. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960013786A 1996-04-30 1996-04-30 Improved image coding system having functions for controlling generated amount of coded bit stream KR100203678B1 (en)

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