KR970019567A - Adaptive Video Coding System - Google Patents
Adaptive Video Coding System Download PDFInfo
- Publication number
- KR970019567A KR970019567A KR1019950032852A KR19950032852A KR970019567A KR 970019567 A KR970019567 A KR 970019567A KR 1019950032852 A KR1019950032852 A KR 1019950032852A KR 19950032852 A KR19950032852 A KR 19950032852A KR 970019567 A KR970019567 A KR 970019567A
- Authority
- KR
- South Korea
- Prior art keywords
- transform coefficient
- coefficient value
- dct transform
- dct
- block
- Prior art date
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Classifications
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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
- H04N19/90—Methods 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
- H04N19/94—Vector quantisation
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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
- H04N19/169—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
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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
- H04N19/50—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
- H04N19/577—Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
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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
- H04N19/60—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]
Abstract
본 발명은 데시메이션과 인터포레이션을 이용함으로서 보다 적은 계산량과 간단한 하드웨어로 구현이 가능하며, 화면비가 서로 다른 수상기에 각각 대응가능한 적어도 다른 화면 사이즈를 갖는 복수의 압축 영상신호를 생성할 수 있도록 한 영상 부호화 시스템에 관한 것으로, 이를 위하여 본 발명은, 현재 프레임을 8×8의 DCT 블록으로 분할한 다음, 이 분할된 각 DCT블럭들에 대한 시간영역의 영상신호를 코사인함수를 이용하여 8×8의 주파수영역의 DCT 변환계수값으로 변환하기 위한 DCT 블록, 변환된 현재 프레임의 8×8의 각 DCT 변환계수값과 시간축상에서 이에 대응하는 이전 프레임의 대응 8×8의 각 DCT변환계수값에 의거하여 구해지는 제1차분신호에 대해 제1코드 테이블을 이용한 벡터 양자화를 적용하여 압축 부호화한 다음 부호화된 특정 화면 사이즈의 영상신호를 전송기에 제공하는 제1부호화 경로, 및 변환된 현재 프레임의 8×8의 각 DCT변환계수값에서 추출한 소정 크기의 저역부분의 각 DCT변환계수값과 시간축상에서 이에 대응하는 이전 프레임의 소정 크기의 대응 저역부분의 각 DCT변환계수값에 의거하여 구해지는 제2차분신호에 대해 제2코드 테이블을 이용한 벡터 양자화를 적용함으로서, 제1부호화 경로에서 출력되는 압축 부호화된 특정 화면 사이즈 보다 적어도 작은 화면 사이즈를 갖는 부호화된 영상신호를 전송기에 제공하는 제2부호화 경로를 포함한다.The present invention can be implemented with less computation and simple hardware by using decimation and interoperation, and it is possible to generate a plurality of compressed video signals having at least different screen sizes corresponding to different receivers with different aspect ratios. The present invention relates to a video encoding system. To this end, the present invention divides a current frame into 8 × 8 DCT blocks, and then uses a cosine function to time-domain video signals for each of the divided DCT blocks. A DCT block for converting a DCT transform coefficient value in the frequency domain of the block, based on each DCT transform coefficient value of 8x8 of the converted current frame and the corresponding DCT transform coefficient value of the corresponding 8x8 of the previous frame corresponding to the time axis. Compression-coded by applying a vector quantization using a first code table to the first difference signal obtained by A first encoding path for providing a video signal of the first encoding path, and each DCT transform coefficient value of a predetermined size extracted from each DCT transform coefficient value of 8x8 of the converted current frame, and a corresponding previous frame on the time axis. By applying vector quantization using a second code table to a second differential signal obtained based on each DCT transform coefficient value of a corresponding low-pass portion of a predetermined size, at least than the compression-coded specific screen size output from the first encoding path. And a second encoding path for providing the transmitter with an encoded video signal having a small screen size.
따라서, 본 발명의 영상 부호화 시스템은 불필요하게 과다한 계산량과 그 구성상의 복잡함이 없이도 채널의 요구에 부응가능한 적어도 다른 화면 사이즈(라인수 및 화소수)를 갖는 압축 부호화된 영상신호를 효과적으로 생성할 수 있는 것이다.Therefore, the video encoding system of the present invention can effectively generate a compressed coded video signal having at least a different screen size (number of lines and number of pixels) that can meet the demands of the channel without unnecessarily excessive computation and configuration complexity. will be.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.
제1도는 본 발명의 바람직한 일실시예에 따른 적응적인 영상 부호화 시스템의 블록구성도.1 is a block diagram of an adaptive video encoding system according to an embodiment of the present invention.
제2도는 본 발명에 따른 적응적인 영상 부호화시에 8×8의 DCT 블록을 4×4의 블록으로 데시메이션하고, 또한 이를 다시 8×8의 DCT 블록으로 인터포레이션하는 예를 도시한 도면.2 is a diagram illustrating an example of decimating an 8x8 DCT block into 4x4 blocks and interpolating the 8x8 DCT block in adaptive image encoding according to the present invention.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1019950032852A KR0178206B1 (en) | 1995-09-29 | 1995-09-29 | Adaptive image coding system |
Applications Claiming Priority (1)
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KR1019950032852A KR0178206B1 (en) | 1995-09-29 | 1995-09-29 | Adaptive image coding system |
Publications (2)
Publication Number | Publication Date |
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KR970019567A true KR970019567A (en) | 1997-04-30 |
KR0178206B1 KR0178206B1 (en) | 1999-05-01 |
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KR1019950032852A KR0178206B1 (en) | 1995-09-29 | 1995-09-29 | Adaptive image coding system |
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KR100867995B1 (en) * | 2006-01-07 | 2008-11-10 | 한국전자통신연구원 | Method and apparatus for video data encoding and decoding |
KR100720871B1 (en) * | 2006-06-20 | 2007-05-23 | 삼성전자주식회사 | Apparatus and method for low distortion display in portable communication terminal |
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1995
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