KR960036698A - Coded bit rate control method and control device - Google Patents

Coded bit rate control method and control device Download PDF

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KR960036698A
KR960036698A KR1019950005848A KR19950005848A KR960036698A KR 960036698 A KR960036698 A KR 960036698A KR 1019950005848 A KR1019950005848 A KR 1019950005848A KR 19950005848 A KR19950005848 A KR 19950005848A KR 960036698 A KR960036698 A KR 960036698A
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proportional constant
macroblock
quantization parameter
calculated
bit rate
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KR1019950005848A
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KR100207417B1 (en
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황덕동
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배순훈
대우전자 주식회사
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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
    • H04N19/146—Data rate or code amount at the encoder output
    • 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
    • H04N19/102—Methods 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
    • H04N19/124—Quantisation
    • 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
    • H04N19/102—Methods 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
    • H04N19/13—Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • 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
    • H04N19/172—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 picture, frame or field
    • 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
    • H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

본 발명은 송신측의 부호화 시스템에서 채널의 요구에 양자화 스텝사이즈를 적응적으로 제어함으로서 전송 비트 레이트에 강하게 부응할 수 있는 비트발생을 제어기법에 관한 것으로, 이를 위하여 본 발명은, 양자화 파라메터의 산출된 비트발생율에 의거해 구해진 i번째 매크로블럭의 비례상수값과 지연된 이전 매크로블럭에서 구해진 다른 비례상수값에 의거하여 비트발생율 함수의 최종 비례상수를 계산하며, 양자화 파라미터 연산수단이 상기 최종 비례상수를 참조하여 양자화 파라메터를 연산하도록 함으로서, 영상의 사이즈에 관계없이 채널에서 요구하는 목표에 상응하는 비트레이트로 비트발생율을 적응적으로 제어하여 수신측의 복호화 시스템에서 복원되는 영상의 화질열화를 방지할 수 있는 것이다.The present invention relates to a method of controlling a bit generation that can strongly comply with a transmission bit rate by adaptively controlling a quantization step size in response to a channel request in a transmission system on the transmitting side. To this end, the present invention provides a method for calculating a quantization parameter. The final proportional constant of the bit rate function is calculated based on the proportional constant value of the i-th macroblock obtained based on the calculated bit rate and the other proportional constant value obtained from the delayed previous macroblock, and the quantization parameter calculating means calculates the final proportional constant. By calculating the quantization parameter by reference, it is possible to adaptively control the bit rate at a bit rate corresponding to the target required by the channel regardless of the size of the image, thereby preventing deterioration of image quality of the image reconstructed in the decoding system at the receiving side. It is.

Description

부호화 비트발생율 제어방법 및 그 제어장치Coded bit rate control method and control device

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

제2도는 본 발명의 바람직한 실시예에 따른 부호화 비트발생율 제어장치의 개념적인 블럭구성도.2 is a conceptual block diagram of a coding bit rate control apparatus according to a preferred embodiment of the present invention.

Claims (5)

현재 처리되는 픽쳐의 목표 비트수와 현재까지 양자화 및 가변길이 부호화된 매크로블럭의 비트발생량에 의거하여 양자화 파라메터를 연산하고, 이 연산된 해당 매크로블럭의 프레임내에서의 활성도에 따라 산출되는 재스캐일된 값에 의거하여 양자화하고자 하는 매크로블럭에 대한 양자화 스텝사이즈를 결정하는 부호화 비트발생율 제어방법에 있어서, 상기 양자화 및 가변길이 부호화된 i번째 매크로블럭의 비트발생량에 의거하여 각 매크로블럭의 비트발생량에 대한 양자화 파라메터 비트발생율 함수의 비례상수를 구하고, 상기 양자화 파라메터와 상기 산출된 비트발생율 함수에 의거해 구해진 상기 i번째 매크로블럭의 비례상수값과 지연된 이전 매크로블럭에서 구해진 다른 비례상수값에 의거하여 상기 비트발생율 함수의 최종 비례상수를 계산하며, 상기 최종 비례상수를 참조하여 상기 양자화 파라메터를 연산하는 것을 특징으로 하는 부호화 비트발생율 제어방법.The quantization parameter is calculated based on the target number of bits of the currently processed picture and the bit generation amount of the quantized and variable length coded macroblocks up to now, and is rescaled calculated according to the activity in the frame of the calculated macroblock. A coding bit generation rate control method for determining a quantization step size for a macroblock to be quantized based on a value, the method comprising: generating a bit generation amount of each macroblock based on a bit generation amount of an i-th macroblock A proportional constant of a quantization parameter bit rate function is obtained, and the bit is based on the proportional constant value of the i-th macroblock obtained based on the quantization parameter and the calculated bit rate function and the other proportional constant value obtained from a delayed previous macroblock. Calculate the final proportional constant of the incidence function And encoding bit rate control method, characterized in that for computing the quantization parameter with reference to the final proportional constant. 제1항에 있어서, 상기 양자화 파라메터에 대한 발생율 함수는, 다음과 같이 계산되고,The method of claim 1, wherein the occurrence rate function for the quantization parameter is calculated as follows. 여기에서, a=(B-T`(N+i+1)/N으로 치환하면, 상기 양자화 파라메터는 다음과 같이 계산되며, Q=F-1() 상기 발생율 함수의 비례상수는, 다음과 같이, 계산되고, K=F(Q) ㆍ Q 상기 식에서 B는 현재까지 발생된 비트량이고, T`는 매크로블럭의 목표 비트수이며, N은 제어장치의 컨버젼스 속도인 부호화 비트발생율 제어방법.Here, if a = (BT` (N + i + 1) / N), the quantization parameter is calculated as follows, and Q = F -1 ( The proportionality constant of the incidence function is calculated as follows, where K = F (Q) Q where B is the amount of bits generated so far, T 'is the number of target bits in the macroblock, and N is the control. A coding bit rate control method, which is a convergence speed of a device. 현재 처리되는 픽쳐의 목표 비트수와 현재까지 양자화 및 가변길이 부호화된 매크로블럭의 비트발생량에 의거하여 양자화 파라메터를 연산하는 수단과, 이 연산된 해당 매크로블럭의 프레임내에서의 활성도의 따라 산출되는 재스캐일된 값에 의거하여 양자화하고자 하는 캐크로블럭에 대한 양자화 스텝사이즈를 결정하는 부호화 비트발생율 제어장치에 있어서, 상기 제어장치는, i번째 매크로블럭의 양자화 파라메터값과 이 양자화 파라메터에 의해 발생하는 i번째 매크로블럭까지의 비트발생량을 승산하여 상기 양자화 파라메터 발생율 함수의 비례상수를 생성하는 수단; 상기 비례상수를 매크로블럭의 처리시간 동안 지연시켜 이전 캐크로블럭에 대한 비례상수를 출력하는 수단; 및 상기 승산수단에서 제공되는 상기 발생율 함수의 비례상수와 상기 지연수단에서 제공되는 이전 매크로블럭의 비례상수에 의거하여 하나의 새로운 비례상수를 생성하는 수단을 더 포함하며, 상기 양자화 파라메터 연산수단은, 상기 새로운 비례상수를 참조하여 양자화하고자 하는 해당 매크로블럭에 대한 양자화 파라메터를 연산하는 것을 특징으로 하는 부호화 비트발생율 제어장치.Means for calculating a quantization parameter based on the target number of bits of the currently processed picture and the bit generation amount of the quantized and variable length coded macroblocks up to now, and the recalculation calculated according to the activity in the frame of the calculated macroblock. A coding bit rate control device for determining a quantization step size for a block to be quantized based on a scaled value, the control device comprising: a quantization parameter value of an i-th macroblock and i generated by the quantization parameter; Means for generating a proportional constant of the quantization parameter incidence function by multiplying the bit generation amount up to a first macroblock; Means for delaying the proportional constant for the processing time of the macro block and outputting a proportional constant for the previous macro block; And means for generating one new proportional constant based on the proportional constant of the occurrence rate function provided by the multiplication means and the proportional constant of the previous macroblock provided by the delay means, wherein the quantization parameter calculating means comprises: And a quantization parameter for a corresponding macroblock to be quantized by referring to the new proportional constant. 제3항에 있어서, 상기 이전 매크로블럭의 비례상수를 출력하는 지연수단은 버퍼인 것을 특징으로 하는 부호화 비트발생율 제어장치.4. The apparatus according to claim 3, wherein the delay means for outputting the proportional constant of the previous macroblock is a buffer. 제3항에 있어서, 상기 새로운 비례상수는, 다음과 같이 계산되며, K=＼βK1′′+(1-β)K2′(0＜β＜1) 상기 식에서 K1`는 현재 매크로블럭의 비례상수이고, K2`는 이전 매크로블럭의 비례상수이며,는 K1`와 K2`의 가중치를 조절하는 값인 것을 특징으로 하는 부호화 비트발생율 제어장치.The method of claim 3, wherein the new proportional constant is calculated as follows: K = ＼βK 1 ' ' + (1-β) K 2 '(0 <β <1) where K 1 `is the current macroblock Is the proportional constant of, K 2 `is the proportional constant of the previous macroblock, The encoding bit rate control apparatus, characterized in that a value for adjusting the weights of K 1 'and K 2'. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950005848A 1995-03-20 1995-03-20 Method and apparatus for controlling generation of bit rate in video encoding KR100207417B1 (en)

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