KR970009386A - Improved Image Coding System Considering Band-Specific Characteristics - Google Patents

Improved Image Coding System Considering Band-Specific Characteristics Download PDF

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KR970009386A
KR970009386A KR1019950023354A KR19950023354A KR970009386A KR 970009386 A KR970009386 A KR 970009386A KR 1019950023354 A KR1019950023354 A KR 1019950023354A KR 19950023354 A KR19950023354 A KR 19950023354A KR 970009386 A KR970009386 A KR 970009386A
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frame
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KR0178222B1 (en
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윤성욱
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배순훈
대우전자 주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods 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
    • H04N19/119Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods 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
    • H04N19/124Quantisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51Motion estimation or motion compensation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/625Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using discrete cosine transform [DCT]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/91Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

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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 영상의 소망하는 압축율을 얻을 수 있으면서도 하드웨어적인 구현을 용이하게 실현할 수 있도록 한 대역별 특성을 고려한 개선된 영상 부호화 시스템에 관한 것으로, 이를 위하여 본 발명은 현재 프레임과 바로 이전 프레임간의 움직임 추정, 보상시에 기존기술에서와 같이 프레임의 전역에 대해 움직임 추정을 수행하는 것이 아니라, 한 프레임을 소정크기의 서브블럭으로 분할한 다음 그 분할된 서브블럭중 주요한 이미지 데이타가 거의 집중되는 가장 저역부분의 서브블럭에 대해서만 움직임 추정, 보상을 수행하도록 함으로서, 실제적인 부호화 시스템에서 그 하드웨어의 비중을 많이 차지하는 움직임 추정, 보상 부분을 보다 작게 구현할 수 있게 함으로서, 전체 부호화 시스템의 하드웨어 구성을 간소화한 것이다.The present invention relates to an improved image coding system considering band-specific characteristics to achieve a desired compression ratio of an image and to easily implement a hardware implementation. To this end, the present invention provides a motion estimation between a current frame and a previous frame. At the time of compensation, instead of performing motion estimation over the entire frame as in the conventional art, the frame is divided into subblocks of a predetermined size, and the lowest part of the divided subblocks where the main image data is almost concentrated. By performing motion estimation and compensation only on the subblock of, the hardware configuration of the entire coding system is simplified by realizing a smaller motion estimation and compensation part that takes up a large portion of the hardware in the actual coding system.

Description

대역별 특성을 고려한 개선된 영상 부호화 시스템Improved Image Coding System Considering Band-Specific Characteristics

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

제1도는 본 발명의 바람직한 실시예에 따른 대역별 특성을 고려한 개선된 영상 부호화 시스템의 개략적인 블럭구성도.1 is a schematic block diagram of an improved video encoding system considering band-specific characteristics according to a preferred embodiment of the present invention.

Claims (5)

부호화하고자 하는 현재 입력 프레임신호와, 이 현재 프레임신호와 바로 이전의 프레임신호를 통해 예측된프레임신호간의 차분신호를 이산 코사인 변환, 스칼라 양자화 및 가변길이 부호화 블럭을 통해 부호화 함으로서 상기 입력 프레임신호를 소망하는 압축율로 부호화하는 영상 부호화 시스템에 있어서, 압축 부호화하고자 하는 상기 현재 입력프레임신호를 저장하기 위한 프레임 메모리(100); 상기 프레임 메모리로부터의 상기 현재의 프레임신호에서 소정 크기의 저역부분의 서브블럭을 추출하고, 상기 현재 프레임 바로 이전 프레임에서 소정 크기의 저역부분의 서브블럭을 추출하는 저역 추출 수단(128,130); 시간적으로 서로 대응하는 위치에 존재하는 추출된 상기 현재 프레임의 저역부분 서브블럭과 상기 이전 프레임 저역부분 서브블럭에 의거하여 상기 저역부분의 움직임 추정 및 보상을 수행하여 저역부분의 예측된 프레임신호를 발생하는 움직임 예측 블럭(132); 상기 프레임 메모리로부터의 현재 프레임신호와 상기 움직임 예측 블럭으로부터의 저역부분의 예측 프레임신호를 감산하여 생성된 차분신호에 대해 8 × 8 단위의 상기 이산 코사인 변환을 수행하여DCT 변환계수들을 발생하는 변환수단(111,112); 상기 DCT 변환계수들로 된 영상 프레임들을 필터링 함으로서 상기 저역부분의 서브블럭을 포함하는 서로 다른 대역을 갖는 N 개의 서브블럭으로 분할하는 대역 분할 블럭(114); 복수의 양자화기를 포함하여 상기 분할된 N 개의 각 서브블럭들에 대해 스칼라 양자화를 각각 수행하여 복수의 양자화된 DCT 변환계수 블럭들을 생성하는 양자화 블럭(116); 상기 움직임 추정, 보상을 위해 그 대역별로 분할된 상기 N 개의 양자화된 DCT 변환계수 블럭들에 대해 역양자화, 대역 합성 및 역이산 코사인 변환을 수행하여 변환되기 이전의 원래의 차분신호로 복원하는 복호화 수단(118,120,122); 상기 복원된 차분신호와 상기 움직임 예측 블럭으로부터의 상기 저역부분의 예측된 프레임신호를 가산하여 상기 이전 프레임신호를 생성하며, 이 생성된 이전 프레임을 상기 저역 추출 수단에 제공하는 이전 프레임 생성수단(124,126); 및 상기 양자화 블럭으로부터 제공되는 상기 분할된 N 개의 양자화된 DCT 변환계수 블럭들을 인터리빙하고, 이 인터리빙된 DCT 변환계수들을 상기 가변길이 부호화 블럭에 제공하는 인터리빙 블럭(136)으로 이루어진 대역별 특성을 고려한 개선된 영상 부호화 시스템.The difference between the current input frame signal to be encoded and the frame signal predicted through the current frame signal and the immediately preceding frame signal is encoded by using a discrete cosine transform, a scalar quantization, and a variable length coding block. An image encoding system for encoding at a compression rate, comprising: a frame memory (100) for storing the current input frame signal to be compressed and encoded; Low-band extracting means (128,130) for extracting a sub-block of a predetermined size from the current frame signal from the frame memory, and extracting a sub-block of a predetermined size from the frame immediately before the current frame; Based on the extracted low-band subblock of the current frame and the previous frame low-block subblock that exist at positions corresponding to each other in time, motion estimation and compensation of the low-pass portion are performed to generate a predicted frame signal of the low-pass portion. A motion prediction block 132; Conversion means for generating discrete CT transform coefficients by performing the discrete cosine transform of 8x8 unit on the difference signal generated by subtracting the current frame signal from the frame memory and the predictive frame signal of the low range part from the motion prediction block (111,112); A band dividing block (114) for dividing the image frames of the DCT transform coefficients into N subblocks having different bands including the subblocks of the low-pass portion; A quantization block (116) for generating a plurality of quantized DCT transform coefficient blocks by performing scalar quantization on each of the divided N subblocks, including a plurality of quantizers; Decoding means for performing inverse quantization, band synthesis, and inverse discrete cosine transform on the N quantized DCT transform coefficient blocks divided by bands for the motion estimation and compensation to restore the original differential signal before conversion (118,120,122); Previous frame generation means (124, 126) for generating the previous frame signal by adding the reconstructed difference signal and the predicted frame signal of the low-pass portion from the motion prediction block, and providing the generated previous frame to the low-band extraction means (124, 126) ); And an interleaving block 136 consisting of interleaving the divided N quantized DCT transform coefficient blocks provided from the quantization block and providing the interleaved DCT transform coefficients to the variable length coding block. Image coding system. 제1항에 있어서, 상기 대역 분할 블럭은, 서로 다른 대역을 갖는 상기 N 개의 서브블럭을 각각 생성하는 N개의 대역 통과 필터로 구성된 것을 특징으로 하는 대역별 특성을 고려한 개선된 영상 부호화 시스템.The improved image encoding system of claim 1, wherein the band division block comprises N band pass filters each generating the N sub blocks having different bands. 제2항에 있어서, 상기 양자화 블럭은 상기 분할된 N 개의 서브블럭들을 각각 양자화하는 4개의 양자화기를포함하는 것을 특징으로 하는 대역별 특성을 고려한 개선된 영상 부호화 시스템.3. The improved image encoding system of claim 2, wherein the quantization block includes four quantizers for quantizing the divided N subblocks, respectively. 제3항에 있어서, 상기 인터리빙 블럭은: 상기 N 개의 양자화된 DCT 변환계수 블럭들에 상응하는 N 개의 스캐너로 구성된 스캐닝 블럭(134); 스위칭 제어신호에 의거하여 상기 각 스캐너의 출력을 순차 또는 연속적으로 절환하는스위칭 블럭(1343); 및 상기 스위칭 블럭에 스위칭 제어신호를 제공하며, 상기 각 스캐너로부터 출력되는 양자화된 DCT변환계수들을 인터리빙하여 시리얼 형태로 상기 가변길이 부호화 블럭에 제공하는 인터리버(1345)로 구성된 것을 특징으로 하는 대역별 특성을 고려한 개선된 영상 부호화 시스템.4. The apparatus of claim 3, wherein the interleaving block comprises: a scanning block (134) consisting of N scanners corresponding to the N quantized DCT transform coefficient blocks; A switching block 1343 for sequentially or successively switching outputs of the respective scanners based on a switching control signal; And an interleaver 1345 for providing a switching control signal to the switching block and interleaving the quantized DCT transform coefficients output from the respective scanners to provide the variable length coding block in serial form. Improved Image Coding System with Consideration. 제1항에 있어서, 상기 복호화 수단은, 그 대역별로 분할된 상기 N 개의 양자화된 DCT 변환계수 블럭들에 상응하는 N 개의 역양자화기를 포함하며, 상기 각각의 역양자화기를 통해 상기 N 개의 양자화된 DCT 변환계수 블럭들을 각각 역양자화하는 것을 특징으로 하는 대역별 특성을 고려한 개선된 영상 부호화 시스템.2. The apparatus of claim 1, wherein the decoding means comprises N inverse quantizers corresponding to the N quantized DCT transform coefficient blocks divided by bands, and through the inverse quantizers, the N quantized DCTs. An improved image coding system considering band-specific characteristics, characterized by inverse quantization of transform coefficient blocks. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950023354A 1995-07-31 1995-07-31 Improved image encoding system using band characteristic KR0178222B1 (en)

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