KR980007717A - Long time transition adaptive bit allocation method for controlling bit generation of video encoder - Google Patents

Long time transition adaptive bit allocation method for controlling bit generation of video encoder Download PDF

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Publication number
KR980007717A
KR980007717A KR1019960019989A KR19960019989A KR980007717A KR 980007717 A KR980007717 A KR 980007717A KR 1019960019989 A KR1019960019989 A KR 1019960019989A KR 19960019989 A KR19960019989 A KR 19960019989A KR 980007717 A KR980007717 A KR 980007717A
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South Korea
Prior art keywords
bit allocation
bit
scene change
video encoder
allocation method
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KR1019960019989A
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Korean (ko)
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KR100228542B1 (en
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장성환
장순화
권순홍
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이준
한국전기통신공사
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Priority to KR1019960019989A priority Critical patent/KR100228542B1/en
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Publication of KR100228542B1 publication Critical patent/KR100228542B1/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
    • H04N19/134—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
    • H04N19/142—Detection of scene cut or scene change
    • 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
    • H04N19/10—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
    • H04N19/184—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 bits, e.g. of the compressed video stream

Abstract

본 발명은 비디오 인코더의 비트 발생을 제어용 장면 전환 적응 비트 활당방법에 관한 것으로, 디지틀 비디오 인코더에서 부분적인, 혹은 전면적인 장면전환시 발생하는 화질 저하를 해결하기 위한 비트 할당 방법을 제공한다. 이를 위하여 별도의 장면전환 검출 알고리즘을 사용하지 않고 매크로블럭마다 순차적으로 부호화하는 과정에서 인트라 모드 매크로블럭의 개수를 이용하여 적응적으로 비트 할당량을 조절한다. 본 발명과 같이 비트 할당을 하면, 별도의 장면전환 검출을 위한 회로없이도 장면전환되는 영상의 화질이 개선되며, 또한 인트라모드 매크로 블록의 개수가 차지하는 면적의 비율에 의하여 비트 할당량을 증가시키기 때문에 영상의 전면적인 장면전환뿐만 아니라, 일부만 장면전환되어도 그에 상응하도록 할당량이 증가되어 화질이 개선되는 효과가 있다.The present invention relates to a scene switching adaptive bit allocation method for controlling the bit generation of a video encoder, and provides a bit allocation method for solving the image degradation caused by partial or full scene change in a digital video encoder. To this end, the bit allocation is adaptively adjusted using the number of intra mode macroblocks in the process of sequentially encoding each macroblock without using a separate scene change detection algorithm. When the bit allocation is performed as in the present invention, the image quality of the scene changeover is improved without a circuit for detecting a separate scene change, and the bit allocation is increased by the ratio of the area occupied by the number of intra mode macroblocks. In addition to the full-scale scene change, even if only a partial scene change has a corresponding quota, the image quality is improved.

Description

비디오 인코더의 비트발생을 제어용 장며전환적응 비트 할당방법Long time transition adaptive bit allocation method for controlling bit generation of video encoder

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.

제 1 도는 본 발명의 실시예에 의한 MPEG 인코더의 블럭도.1 is a block diagram of an MPEG encoder according to an embodiment of the present invention.

제 2 도는 본 발명의 실시예에 의한 MPEG 디코더의 블럭도.2 is a block diagram of an MPEG decoder according to an embodiment of the present invention.

제 3 도는 본 발명의 실시예에 의한 GOP내 영상의 갯수가 9일 경우 I, P 및 B 모드 영상의 관계를 나타낸 도면.3 is a diagram showing the relationship between I, P and B mode images when the number of images in a GOP is 9 according to an embodiment of the present invention.

Claims (2)

비디오 인코더의 비트 발생율을 제어하기 위한 비트 할당방법에 있어서, 예측 부호화 모드 영상의 경우에 별도의 장면전환 검출없이 인트라 모드 매크로 블록의 갯수를 이용하여 매크로블럭마다 비트 할당량을 재조정 하는 것을 특징으로 하는 비디오 인코더의 비트 발생율 제어용 장면 전환 적을 비트 할당방법.16. A bit allocation method for controlling a bit rate of a video encoder, wherein the bit allocation is re-adjusted for each macroblock by using the number of intra mode macroblocks without additional scene change detection in the case of a prediction encoding mode image. A bit allocation method for scene change enemy for bit rate control of an encoder. 제 1 항에 있어서, 비트할당을 하기 위한 양자화기 스텝크기의 파라미터가, dj는 j번째 매크뢰블럭까지의 파라미터값, do는 dj의 초기값,Bj는 j번째 매크로 블록까지 발생한 비트량의 누계, TI는 I모드 영상에 할당한 비트량 nIMB는 j번째 매크로 블록까지 발생한 I모드 매크로블럭의 갯수, nMBinP는 한 영상내 매크로 블록의 총 갯수, TP는 P모드 영상에 할당한 비트량이라 할 때,The method according to claim 1, wherein the parameter of the quantizer step size for bit allocation is a dj value of a parameter up to a jth macroblock, do is an initial value of dj, Bj is the cumulative amount of bits generated up to the j macro block, TI is the bit amount allocated to the I mode image nIMB is the number of I mode macro blocks generated up to the j macro block, nMBinP is the total number of macro blocks in one image, Is the amount of bits allocated to P mode video, dj-d0=Bj-(TI×(nIMB/nMBinP)-TP×((j-nIMB/nMBinP))dj-d0 = Bj- (TI × (nIMB / nMBinP) -TP × ((j-nIMB / nMBinP)) 임을 특징으로 하는 비디오 인코더의 비트 발생을 제어용 장면전환 적응 비트 할당 방법.And a scene change adaptive bit allocation method for controlling bit generation of a video encoder.
KR1019960019989A 1996-06-05 1996-06-05 Adaptive bit allocation method for controlling bit generation in video encoder KR100228542B1 (en)

Priority Applications (1)

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KR1019960019989A KR100228542B1 (en) 1996-06-05 1996-06-05 Adaptive bit allocation method for controlling bit generation in video encoder

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Application Number Priority Date Filing Date Title
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Publications (2)

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KR980007717A true KR980007717A (en) 1998-03-30
KR100228542B1 KR100228542B1 (en) 1999-11-01

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