KR950023011A - Video encoding method and device according to buffer status - Google Patents

Video encoding method and device according to buffer status Download PDF

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Publication number
KR950023011A
KR950023011A KR1019930031625A KR930031625A KR950023011A KR 950023011 A KR950023011 A KR 950023011A KR 1019930031625 A KR1019930031625 A KR 1019930031625A KR 930031625 A KR930031625 A KR 930031625A KR 950023011 A KR950023011 A KR 950023011A
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South Korea
Prior art keywords
buffer
frames
filtering
video encoding
transform coefficient
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KR1019930031625A
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Korean (ko)
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KR0157467B1 (en
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김성태
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김광호
삼성전자 주식회사
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Priority to KR1019930031625A priority Critical patent/KR0157467B1/en
Publication of KR950023011A publication Critical patent/KR950023011A/en
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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
    • H04N19/134Methods 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
    • H04N19/146Data rate or code amount at the encoder output
    • H04N19/152Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
    • 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
    • H04N19/129Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]

Abstract

본 발명은 버퍼상태에 따른 동영상부호화방법 및 장치에 관한 것이다.The present invention relates to a video encoding method and apparatus according to a buffer state.

본 발명은 버퍼의 충만정도에 따라 프레임타입에 상관없이 부호화할 DCT계수의 영역을 가변시키는 기능과, I 프레임일 경우 DC성분만 부호화하는 기능과, B,P프레임일 경우 DCT계수를 하나도 부호화하지 않고 동벡터만 전송하는 기능, 및 프레임타입에 상관없이 부호화할 DCT계수의 갯수를 스캔-패턴의 스캔순서대로 제한하는 기능을 구비한다.According to the present invention, a function of varying an area of a DCT coefficient to be encoded regardless of a frame type according to a buffer fullness, a function of encoding only a DC component in an I frame, and no DCT coefficient in a B or P frame And the function of transmitting only the same vector, and limiting the number of DCT coefficients to be coded regardless of the frame type in the scan order of the scan-pattern.

따라서, 버퍼의 오버플로우를 방지할 뿐 아니라 화질에 손상을 입히지 않고 데이타를 복원할 수 있는 효과를 제공한다.Thus, not only the buffer overflow is prevented, but also the effect of restoring data without damaging the image quality is provided.

Description

버퍼상태에 따른 동영상부호화방법 및 장치Video encoding method and device according to buffer status

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

제1도는 본 발명에 의한 버퍼상태에 따른 동영상부호화장치를 나타내는 블록도,1 is a block diagram showing a video encoding apparatus according to a buffer state according to the present invention;

제2도는 제1도 장치에서 버퍼 충만도에 따른 영역구분을 나타내는 개념도,FIG. 2 is a conceptual diagram illustrating region classification according to buffer fullness in the apparatus of FIG. 1;

제3도는 제1도 장치에서 버퍼의 오버플로우를 방지하기 위한 동영상 부호화방법을 설명하기 위한 개념도.3 is a conceptual diagram illustrating a video encoding method for preventing overflow of a buffer in a FIG. 1 apparatus.

Claims (8)

연속되는 동화상에 대해 I 프레임, P프레임, B프레임의 일정한 배열로 부호화하는 장치에 있어서, 전송신호의 비트비를 일정하게 유지하기 위한 버퍼; 상기 버퍼의 충만정도에 따라 필터링대역을 제한하여 소정블럭의 변환계수를 필터링시키는 로우패스필터; 소정블럭의 변환계수 또는 필터링된 변환계수를 양자화하는 양자화부; 및 상기 버퍼의 충만정도에 따라 스캔갯수를 제한하여 상기 양자화된 계수를 사전 설정된 스캔-패턴에 따라 제한된 갯수만큼 스캔하여 발생되는 데이타를 부호화하는 가변장부호화부를 포함하는 버퍼상태에 따른 동영상부호화장치.An apparatus for encoding a continuous array of I-frames, P-frames, and B-frames, comprising: a buffer for maintaining a constant bit rate of a transmission signal; A low pass filter for filtering a conversion coefficient of a predetermined block by limiting a filtering band according to the fullness of the buffer; A quantization unit for quantizing a transform coefficient or a filtered transform coefficient of a predetermined block; And a variable length encoding unit configured to limit the number of scans according to the fullness of the buffer and to encode data generated by scanning the quantized coefficients by a limited number according to a preset scan-pattern. 제1항에 있어서, 상기 버퍼는 버퍼의 크기와 부호화할 영상의 총픽셀수에 따라 언더플로우위험영역, 정상동작영역, 오버플로우위험영역으로 나누어지는 것을 특징으로 하는 동영상부호화장치.The video encoding apparatus of claim 1, wherein the buffer is divided into an underflow risk region, a normal operation region, and an overflow risk region according to the size of the buffer and the total number of pixels of an image to be encoded. 제2항에 있어서, 상기 로우패스필터는 부호화하는 프레임타입이 I프레임이고, 상기 버퍼가 오버플로우위험영역에 있을 경우 변환계수의 DC성분만을 필터링시키는 것을 특징으로 하는 동영상부호화장치.The video encoding apparatus of claim 2, wherein the low pass filter filters only the DC component of the conversion coefficient when the frame type to be encoded is an I frame and the buffer is in the overflow risk region. 제2항에 있어서, 상기 로우패스필터는 부호화하는 프레임타입이 P프레임 및 B프레임이고, 상기 버퍼가 오버플로우위험영역에 있을 경우 변환계수를 필터링시키지 않는 것을 특징으로 하는 동영상부호화장치.The video encoding apparatus of claim 2, wherein the low-pass filter encodes P-frames and B-frames, and does not filter conversion coefficients when the buffer is in an overflow risk region. 제4항에 있어서, 상기 변환계수 필터링 대신에 동벡터를 전송하는 것을 특징으로 하는 동영상부호화장치.The video encoding apparatus of claim 4, wherein a motion vector is transmitted instead of the transform coefficient filtering. 연속되는 동화상에 대해 I 프레임, P프레임, B프레임의 일정한 배열로 부호화시 전송신호의 비트비를 일정하게 유지하기 위한 버퍼의 상태에 따라 부호화하는 방법에 있어서, 상기 버퍼의 충만정도에 따라 버퍼를 언더플로우위험영역, 정상동작영역, 오버플로우위험영역으로 나누는 단계; 상기 버퍼가 오버플로우위험영역에 있을 경우 필터링대역을 제한하여 소정블럭의 변환계수를 필터링시키는 단계; 소정블럭의 변환계수 또는 상기 필터링된 변환계수를 양자화하는 단계; 및 상기 버퍼가 오버플로우위험영역에 있을 경우 스캔갯수를 제한하여 상기 양자화된 계수를 사전 설정된 스캔-패턴에서 제한된 갯수만큼 스캔하여 부호화하는 단계를 포함하는 버퍼상태에 따른 동영상부호화방법.A method of encoding a buffer according to a buffer state in order to maintain a constant bit rate of a transmission signal when encoding a continuous array of I frames, P frames, and B frames. Dividing into an underflow hazard zone, a normal operating zone, and an overflow hazard zone; Filtering the conversion coefficient of a predetermined block by limiting a filtering band when the buffer is in an overflow risk area; Quantizing a transform coefficient of the block or the filtered transform coefficient; And limiting the number of scans when the buffer is in the overflow risk area, and scanning and encoding the quantized coefficients by a limited number in a preset scan-pattern. 제6항에 있어서, 상기 필터링단계는 I프레임의 영상부호화시 변환계수의 DC성분이 필터링되는 것을 특징으로 하는 버퍼상태에 따른 동영상부호화방법.7. The video encoding method according to claim 6, wherein the filtering step includes filtering the DC component of the transform coefficient during video encoding of an I frame. 제6항에 있어서, 상기 필터링단계는 P프레임 및 B프레임의 영상부호화시 변환계수를 필터링하지 않는 대신 동벡터가 전송되는 것을 특징으로 하는 버퍼상태에 따른 동영상부호화방법.The video encoding method according to claim 6, wherein in the filtering step, a motion vector is transmitted instead of filtering a transform coefficient when encoding P frames and B frames. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930031625A 1993-12-30 1993-12-30 Moving image encoding method and device KR0157467B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100522121B1 (en) * 1997-12-17 2006-01-12 삼성전자주식회사 MPEG encoder to limit DCT coefficient according to buffer status

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100522121B1 (en) * 1997-12-17 2006-01-12 삼성전자주식회사 MPEG encoder to limit DCT coefficient according to buffer status

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