KR970057980A - Method and apparatus for allocating bit rate of variable rate video encoder - Google Patents

Method and apparatus for allocating bit rate of variable rate video encoder Download PDF

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Publication number
KR970057980A
KR970057980A KR1019950058738A KR19950058738A KR970057980A KR 970057980 A KR970057980 A KR 970057980A KR 1019950058738 A KR1019950058738 A KR 1019950058738A KR 19950058738 A KR19950058738 A KR 19950058738A KR 970057980 A KR970057980 A KR 970057980A
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bit
bit rate
rate
amount
unit time
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KR1019950058738A
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Korean (ko)
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KR100214584B1 (en
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서강수
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구자홍
Lg 전자 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
    • H04N19/152—Data rate or code amount at the encoder output by measuring the fullness of the transmission buffer
    • 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
    • H04N19/134—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
    • H04N19/136—Incoming video signal characteristics or properties
    • H04N19/14—Coding unit complexity, e.g. amount of activity or edge presence estimation
    • 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

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

본 발명은 가변율 동영상 부호화 기법에서 화질을 기반으로 하여 비트율을 할당하는 기술에 관한 것으로, 종래의 가변율 부호화 방식에 있어서는 고정된 양자화기를 사용한 후 발생된 비트량을 기준으로 실제 가변율 부호화기에 사용될 비트량을 예측하여 할당하게 되므로 균등한 화질을 제공할 수 없는 결함이 있었는 바, 본 발명은 이를 해결하기 위하여, 입력영상에 대해 단위시간당 발생하는 비트량이 소정치로 고정되게 부호화를 수행하는 제1단계와, 고정율 부호화가 수행되는 동안 발생되는 입력 프레임에 대해 복원된 프레임의 화질을 평가하여 저장하는 제2단계와, 전체 영상에 대한 고정율 부호화가 종료되는 것을 확인하여 저장된 화질 평가치를 기준으로 하여 단위 시간별의 목표 비트량을 계산하여 저장하는 제3단계와, 출력 버퍼에서 저장된 단위시간별 목표비트량을 기준으로 하여 비트율오차를 계산하고, 비트율 조정기에서 비트율오차와 영상내 복잡도를 기준으로 양자화 단계의 크기를 조정하여 단위시간당 발생되는 비트량이 목표치와 일치하게 하는 제4단계를 통해 비트량을 할당하도록 하였다.The present invention relates to a technique for allocating a bit rate based on image quality in a variable rate video encoding technique. In the conventional variable rate coding scheme, a variable quantizer is used for an actual variable rate encoder based on a bit amount generated after using a fixed quantizer. Since the bit amount is predicted and allocated, there is a defect that cannot provide an even picture quality. According to the present invention, in order to solve the problem, the present invention provides a first method of encoding a fixed amount of bits generated per unit time with respect to an input image at a predetermined value. And a second step of evaluating and storing the image quality of the reconstructed frame with respect to the input frame generated during the fixed rate encoding, and confirming that the fixed rate encoding for the entire image is finished based on the stored image quality evaluation value. A third step of calculating and storing a target bit amount for each unit time, and storing it in an output buffer Through the fourth step, the bit rate error is calculated based on the target bit amount per unit time, and the bit rate controller adjusts the size of the quantization step based on the bit rate error and the complexity in the image to make the bit amount generated per unit time match the target value. Bit amount is allocated.

Description

가변율 동영상 부호화기의 비트량 할당방법 및 장치Method and apparatus for allocating bit rate of variable rate video encoder

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

제2도는 본 발명의 비트량 할당방법이 적용되는 가변율 동영상 부호화기의 블럭도,2 is a block diagram of a variable rate video encoder to which the bit rate allocation method of the present invention is applied;

제3도는 본 발명에 따른 비트율 할당방법을 보인 그래프.3 is a graph showing a bit rate allocation method according to the present invention.

Claims (4)

입력영상에 대해 단위시간당 발생하는 비트량이 소정치로 고정되게 부호화를 수행하는 제1단계와; 고정율 부호화가 수행되는 동안 발생되는 입력 프레임에 대해 복원된 프레임의 화질을 평가하여 저장하는 제2단계와; 전체 영상에 대한 고정율 부호화가 종료되는 것을 확인하여 저장된 화질 평가치를 기준으로 하여 단위 시간별의 목표 비트량을 계산하여 저장하는 제3단계와; 출력 버퍼에서 저장된 단위 시단별 목표비트량을 기준으로 하여 비트율오차를 계산하고, 비트율 조정기에서 비트율오차와 영상내 복잡도를 기준으로 양자화 단계의 크기를 조정하여 단위시간당 발생되는 비트량이 목표치와 일치하게 하는 제4단계로 이루어지는 것을 특징으로 하는 가변율 동영상 부호화기의 비트량 할당방법.A first step of encoding the fixed amount of bits generated per unit time with respect to the input image at a predetermined value; A second step of evaluating and storing the image quality of the reconstructed frame with respect to the input frame generated during the fixed rate encoding; A third step of confirming that the fixed rate encoding for the entire image is finished and calculating and storing a target bit amount for each unit time based on the stored image quality evaluation value; The bit rate error is calculated based on the target bit amount per unit time stored in the output buffer, and the bit rate controller adjusts the size of the quantization step based on the bit rate error and the complexity in the image to make the bit amount generated per unit time match the target value. The bit rate allocation method of a variable rate video encoder, characterized in that the fourth step. 제1항에 있어서, 제3단계는 전체 구간을 비교적 긴 시간단위로 K개 분할한 후 각 시간단위별로 비트평가함수(Bti)를 계산하는 1차 비트율 할당단계와; 1차적으로 할당된 비트량(Cti)을 기준으로 각 구간을 비교적 짧은 시간단위로 재 분할한 후 각 시간단위별로 비트평가함수(Bsi')를 계산하는 2차 비트율 할당단계로 이루어지는 것을 특징으로 하는 가변율 동영상 부호화기의 비트량 할당방법.The method of claim 1, further comprising: a first bit rate allocation step of calculating a bit evaluation function (B ti ) for each time unit after dividing K whole sections into relatively long time units; And a second bit rate allocation step of re-dividing each section into relatively short time units based on the first allocated bit amount C ti and calculating a bit evaluation function B si 'for each time unit. A bit rate allocation method of a variable rate video encoder. 제2항에 있어서, 1차 비트율 할당단계에서의 각 구간별 비트량(Cti)은 다음의 식을 이용하여 비트율을 할당하는 것을 특징으로 하는 가변율 동영상 부호화기의 비트량 할당방법.3. The method according to claim 2, wherein the bit rate (C ti ) for each section in the first bit rate allocation step is assigned a bit rate by using the following equation. Cti= C ti = BT:사전에 결정된 전체 영상에 대한 비트량, Bti: 구간ti에 포함된 각 프레임별 비트 평가함수의 합.B T : Bit amount of the entire image determined in advance, B ti : Sum of bit evaluation functions for each frame included in the interval ti . 제2항에 있어서, 2차 비트율 할당단계에서 각 구간의 비트량(Rsi)은 다음의 식을 이용하여 비트율을 할당하는 것을 특징으로 하는 가변율 동영상 부호화기의 비트량 할당방법.3. The method of claim 2, wherein the bit rate (R si ) of each section in the second bit rate allocation step is assigned a bit rate using the following equation. Rsi=f(Bsi')R si = f (B si ') Bsi': 구간(si)에 포함된 각 프레임별 비트평가함수의 합, f( · ): 비트 평가함수로부터 각 구간의 비트량을 계산하는 함수.B si ': Sum of bit evaluation functions for each frame included in the section si, f (·): A function for calculating the bit amount of each section from the bit evaluation function. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950058738A 1995-12-27 1995-12-27 Method and apparatus for alloting bit quantity of variable rate moving image encoder KR100214584B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010043203A (en) * 1999-03-01 2001-05-25 마츠시타 덴끼 산교 가부시키가이샤 Variable-length frame transmission device, and variable-length frame transmission method
KR100813763B1 (en) * 2000-07-14 2008-03-13 소니 가부시끼 가이샤 Video signal coding method and video signal encoder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100814431B1 (en) * 2001-04-25 2008-03-18 삼성전자주식회사 Apparatus for transmitting broadcast signal, encoding system for encoding broadcast signal adapted variable bit rate and decoding system thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010043203A (en) * 1999-03-01 2001-05-25 마츠시타 덴끼 산교 가부시키가이샤 Variable-length frame transmission device, and variable-length frame transmission method
KR100813763B1 (en) * 2000-07-14 2008-03-13 소니 가부시끼 가이샤 Video signal coding method and video signal encoder

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