KR970073138A - 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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KR970073138A
KR970073138A KR1019960013785A KR19960013785A KR970073138A KR 970073138 A KR970073138 A KR 970073138A KR 1019960013785 A KR1019960013785 A KR 1019960013785A KR 19960013785 A KR19960013785 A KR 19960013785A KR 970073138 A KR970073138 A KR 970073138A
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spatial complexity
frequency
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김종일
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배순훈
대우전자 주식회사
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Abstract

본 발명은, MC-DCT양자화를 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 이산 푸리에 변환(DFT)을 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 대해 공간 복잡도값을 산출하고, 각각 산출된 각 이전 프레임의 공간 복잡도값들을 평균하여 기설정된 복수의 이전 프레임에 대한 평균 공간 복잡도값들을 평균하여 기설정된 복수의 이전 프레임에 대한 평균 공간 복잡도값을 산출하는 공간 복잡도 계산수단; 산출된 복수의 프레임의 평균 공간 복잡도값을 DCT 양자화 및 엔트로피 부호화를 갖는 부호화 수단을 통해 연재 부호화하고자 하는 프레임의 복잡도로서 참조하며, 부호화를 위해 입력되는 현재 프레임의 주파수 통과대역폭을 적응적으로 제한하기 위한 기설정된 복수의 대역폭 결정신호들중 산출된 평균 공간 복잡도값에 대응하는 대역폭 결정신호를 발생하는 제어수단; 및 입력 현재 프레임 신호에 대한 공간영역의 영상신호를 2차원 이산 푸리에 변환을 이용하여 M×N 블록 단위의 주파수 영역의 2차원 DFT 변환계수들로 변환하고, 제어수단으로부터 제공되는 발생된 대역폭 결정신호에 의거하여 변환된 2차원 DFT 변환계수 블록들에 대한 고주파 통과 대역을 결정하며, 변환된 각 2차원 DFT 변환계수 블록의 고주파 통과 대역을 결정된 대역폭으로 제한하고, 대역폭이 제한된 양자화된 각 DFT 블록들 각각에 대해 역이산 푸리에 변환을 수행하여 부호화전의 원신호로 복원하며, 원신호로 복원된 대역폭 제한 프레임 신호를 움직이 추정, 보상을 위한 현재 프레임 신호로써 부호화 수단에 제공하는 주파수 선택 수단을 포함함으로써, 부호화 수단에서의 양자화시 과도한 스텝 사이즈의 증가 없이 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 discrete Fourier transform (DFT) to adaptively adjust the amount of bits after encoding. Calculates a spatial complexity value for each of the previous frames reconstructed for motion estimation and compensation, averages the calculated spatial complexity values of the previous frames, and averages the average spatial complexity values for a predetermined plurality of previous frames Calculating an average spatial complexity value for a predetermined plurality of previous frames; Complexity calculation means; The average spatial complexity value of the calculated plurality of frames is referred to as a complexity of a frame to be serialized through encoding means having DCT quantization and entropy encoding and the frequency pass bandwidth of the current frame inputted for encoding is adaptively limited Control means for generating a bandwidth determination signal corresponding to the calculated average spatial complexity value among a plurality of predetermined bandwidth determination signals for the predetermined bandwidth; And converting the video signal in the spatial domain for the input current frame signal into two-dimensional DFT transform coefficients in the frequency domain of the M × N block unit using the two-dimensional discrete Fourier transform, Dimensional DFT transform coefficient blocks based on the transformed 2D DFT transform coefficient block, limits the high-frequency passband of each transformed 2D DFT transform coefficient block to a determined bandwidth, and quantizes each quantized DFT block And frequency selection means for restoring the original signal before coding by performing an inverse discrete Fourier transform on each of the signals and providing the restored bandwidth-limited frame signal to the coding means as a current frame signal for motion estimation and compensation , The amount of bits generated after the encoding is increased without increasing the step size excessively at the time of quantization in the encoding means. You can typically be adjusted.

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. 제 2도는 본 발명의 따라 일예로서 8×8 픽셀 블록에 대하여 그 복잡도에 의거하여 결정되는 고주파 성분 제한을 위한 결정 영역을 도시한 도면.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. FIG. 2 is a diagram showing a decision area for limiting a high-frequency component, which is determined based on the complexity, for an 8 × 8 pixel block according to an 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 스텝 사이즈가 조절되는 비트 발생량 조절기능을 갖는 영상 부호화 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 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 대역폭 결정신호들중 상기 산출된 평균 공간 복잡도값에 대응하는 대역폭 결정신호를 발생하는 제어수단; 및 상기 입력 현재 프레임 신호에 대한 공간영역의 영상신호를 2차원 이산 푸리에 변화을 이용하여 M×N 블록 단위의 주파수 영역의 2차원 DFT 변환계수들로 변환하고, 상기 제어수단으로부터 제공되는 발생된 대역폭 결정신호에 의거하여 상기 변환된 2차원 DFT 변환계수 블록들에 대한 고주파 통과 대역을 결정하며, 상기 변환된 각 2차원 DFT 변환계수 블록의 고주파 통과 대역을 상기 결정된 대역폭으로 제한하고, 상기 대역폭이 제한된 양자화된 각 DFT 블록들 각각에 대해 역이산 푸리에 변환을 수행하여 부호화전의 원신호로 복원하며, 원신호로 복원된 상기 대역폭 제한 프레임 신호를 상기 움직임 추정, 보상을 위한 현재 프레임 신호로써 상기 부호화 수단에 제공하는 주파수 선택 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 a reconstructed previous frame, through encoding means including discrete cosine transform, quantization, and entropy encoding, Wherein the step size is adjusted based on the fullness state information of the bitstream stored in an output side buffer, the method comprising the steps of: Calculating a spatial complexity value for each of the previous frames reconstructed for compensation and averaging the calculated spatial complexity values of the respective previous frames to calculate an average spatial complexity value for a predetermined plurality of previous frames; Way; 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 the encoding means and a predetermined number of frames for adaptively limiting the frequency passband bandwidth of the current frame inputted for encoding Control means for generating a bandwidth determination signal corresponding to the calculated average spatial complexity value among the bandwidth determination signals of the bandwidth determination means; And transforming the video signal in the spatial domain for the input current frame signal into two-dimensional DFT transform coefficients in the frequency domain of M × N blocks using a two-dimensional discrete Fourier transform, Dimensional DFT transform coefficient blocks based on a signal, and the high-frequency passband of each transformed two-dimensional DFT transform coefficient block is limited to the determined bandwidth, and the limited bandwidth quantization And reconstructs the original signal as the original signal before performing the inverse discrete Fourier transform on each of the DFT blocks, and supplies the restored bandwidth-limited frame signal to the encoding means as the current frame signal for motion estimation and compensation And a frequency selecting means for selecting a frequency with which a bit is to be generated Image coding system 제 1항에 있어서, 상기 기설정된 각 대역폭 결정신호는, 상기 산출된 각 이전 프레임의 공간 복잡도값, 상기 각 프레임의 공간 복잡도값을 평균하여 얻은 초당 전송되는 복수의 이전 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 bandwidth determination signal includes a spatial complexity value of each of the calculated previous frames, an average error value of a plurality of previous frames transmitted per second obtained by averaging spatial complexity values of the respective frames, Is determined using the standard deviation of the average error value. The image encoding system 제 1항 또는 제 2항에 있어서, 상기 기설정된 복수의 대역폭 결정신호는 상기 각 2차원 DFT변환계수 블록들의 선택적인 대역폭 제한을 위해 각각 다른 정수값을 갖는 4개의 대역폭 결정신호를 포함하는 것을 특징으로 하는 비트 발생량 조절기능을 갖는 영상 부호화 시스템The method of claim 1 or 2, wherein the predetermined plurality of bandwidth determination signals include four bandwidth determination signals each having a different integer value for selective bandwidth limitation of each of the two-dimensional DFT conversion coefficient blocks An image encoding system having a bit generation amount adjustment function 제 1항에 있어서, 상기 주파수 선택 수단은, 상기 현재 프레인 신호에 대한 공간영역의 영상신호를 8×8블록 단위의 2차원 DFT 변환계수들로 변환하는 것을 특징으로 하는 비트 발생량 조절기능을 갖는 영상 부호화 시스템2. The apparatus as claimed in claim 1, wherein the frequency selecting means converts the video signal of the spatial domain for the current frame signal into two-dimensional DFT transform coefficients of 8x8 block units. Encoding system 제 1항 또는 제 4항에 있어서, 상기 주파수 선택 수단은 상기 변환된 각 2차원 DFT 변환계수 블록들에 대해 상기 발생된 대역폭 결정신호 이하의 고주파 성분을 제로(0)값으로 매핑하는 것을 특징으로 하는 비트 발생량 조절기능을 갖는 영상 부호화 시스템The method of claim 1 or 4, wherein the frequency selection unit maps high frequency components below the generated bandwidth determination signal to each of the converted two-dimensional DFT transform coefficient blocks to a zero value Image encoding system having a bit generation amount adjustment function ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019960013785A 1996-04-30 1996-04-30 Improved image coding system having functions for controlling generated amount of coded bit stream KR100203627B1 (en)

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