KR970057945A - Buffer control device of band division coding system - Google Patents

Buffer control device of band division coding system Download PDF

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KR970057945A
KR970057945A KR1019950055651A KR19950055651A KR970057945A KR 970057945 A KR970057945 A KR 970057945A KR 1019950055651 A KR1019950055651 A KR 1019950055651A KR 19950055651 A KR19950055651 A KR 19950055651A KR 970057945 A KR970057945 A KR 970057945A
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quantization step
quantization
proportional coefficient
current frame
bit generation
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KR1019950055651A
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Korean (ko)
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KR100220677B1 (en
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김종락
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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
    • H04N19/15—Data rate or code amount at the encoder output by monitoring actual compressed data size at the memory before deciding storage at 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
    • H04N19/102—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
    • H04N19/134—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
    • H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
    • 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

Abstract

본 발명은 영상 신호를 일정 주파수 대역별로 분할하여 부호화하는 대역 분할 부호화 시스템에 있어서, 각 대역의 보호화되는 영상 정보를 일시 저장하는 버퍼의 저장율을 제어하는 버퍼 제어장치에 관한 것으로, 일정 대역의 현재 프레임 영상 신호와 움직임 보상된 영상신호와 차이 영상 신호를 양자화하는 양자화부; 이 양자화부로부터 제공되는 양자화된 영상 데이타를 런 길이와 레벨에 대응되는 코드로 가변 길이 부호화하는 가변 길이 부호화부; 가변 길이 부호화된 영상 데이타를 일시 저장한 후 고정 비트율로 전송하는 버퍼; 일정 대역의 현재 프레임 영상 신호와 움직임 보상된 영상 신호와 차이 영상 신호에 대한 에너지를 검출하는 에너지를 검출하는 에너지 검출부; 양자화부로부터 제공되는 현재 프레임의 시간축상의 바로 이전 프레임의 양자화 스텝 크기와 버퍼로부터 제공되는 이전 프레임의 비트 발생량 및 이전 프레임에 대한 목표 비트 발생량의 차이값에 의거하여 1차 양자화 스텝 크기를 연산하는 1차 양자화 스켑연산부; 에너지 검출부로부터 제공되는 차이 영상에 대한 에너지 크기와 1차 연산된 양자화 스켑 크기에 의거하여 비트 발생량에 대한 현재 프레임의 비례 계수를 연산하는 비트 발생 비례 계수 연산부; 비트 발생 비례 계수 연산부로부터 제공되는 현재 프레임의 비례 계수와 기산출된 이전프레임의 비례 계수에 기초하여 새로운 2차 양자화 스텝을 연산하며, 이 연산된 2차 양자화 스텝을 입력 영상 신호의 양자화 스텝으로써 양자화부에 제공하는 2차 양자화 스텝 연산부를포함한다.The present invention relates to a buffer control apparatus for controlling a storage rate of a buffer for temporarily storing video information protected in each band in a band division encoding system for dividing and encoding a video signal by a predetermined frequency band. A quantizer for quantizing a current frame video signal, a motion compensated video signal, and a difference video signal; A variable length encoding unit for variable length encoding the quantized image data provided from the quantization unit into codes corresponding to run lengths and levels; A buffer for temporarily storing the variable length coded image data and transmitting the same at a fixed bit rate; An energy detector configured to detect energy for detecting energy of a current frame image signal of a predetermined band, a motion compensated image signal, and a difference image signal; 1 for calculating the first quantization step size based on the difference between the quantization step size of the immediately preceding frame on the time axis of the current frame provided from the quantization unit, the bit generation amount of the previous frame provided from the buffer, and the target bit generation amount for the previous frame. A difference quantization scoop operation unit; A bit generation proportional coefficient calculating unit configured to calculate a proportional coefficient of the current frame with respect to the bit generation amount based on the energy magnitude of the difference image provided from the energy detector and the first-quantized quantization scan size; A new second quantization step is calculated based on the proportional coefficient of the current frame and the previously calculated proportional coefficient provided from the bit generation proportional coefficient calculating unit, and the calculated second quantization step is quantized as a quantization step of the input video signal. It includes a second quantization step calculation unit provided to the unit.

Description

대역 분할부호화 시스템의 버퍼제어장치Buffer control device of band division coding system

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

제2도는 본 발명의 바람직한 실시예를 나타내는 블럭 구성도.2 is a block diagram showing a preferred embodiment of the present invention.

Claims (4)

일정 대역의 현재 프레임 영상 신호와 움직임 보상된 영상 신호와 차이 영상 신호를 양자화하는 양자화부(100); 상기 양자화부로부터 제공되는양자화된 영상 데이타를 런길이와 레벨에 대응되는 코드로 가변 길이 부호화하는 가변 길이 부호화부(110); 상기 가변 길이 부호화된 영상 데이타를 일시 저장한 후 고정 비트율로 전송하는 버퍼(120); 일정 대역의 현재 프레임 영상 신호와 움직임 보상된 영상 신호와 차이 영상 신호에 대한 에너지를 검출하는 에너지 검출부(130); 상기 양자화부(100)로부터 제공되는 상기 현재프레임의 시간축상의 바로 이전 프레임의 양자화 스텝크기 및 상기버퍼(120)로부터 제공되는 상기 이전 프레임의 비트 발생량과 상기 이전 프레임에 대한 목표 비트 발생량과의 차이값에 의거하여 1차 양자화 스텝크기를 연산하는 1차 양자화 스텝 연산부(140); 상기 에너지 검출부(130)로부터 제공되는 상기 차이 영상에 대한 에너지 크기와 상기 1차 연산된 양자화 스텝 크기에 의거하여 비트 발생량에 대한 상기 현재 프레임의 비례계수를 연산하는비트발생 비례 계수 연산부(150); 상기 비트 발생 비례계수 연산부(150)로부터 제공되는 상기 현재 프레임의 비례 계수와 기산출된 상기 이전 프레임의 비례 계수에 기초하여 새로운 2차 양자화 스텝을 연산하며, 이 연산된 2차 양자화 스텝을 상기 입력 영상 신호의 양자화 스텝으로써 상기 양자화부(100)에 제공하는 2차 양자화 스텝 연산부(160)로 이루어진 대역 분할 부호와 시스템의 버퍼 제어 장치.A quantization unit 100 for quantizing a current frame video signal of a predetermined band, a motion compensated video signal, and a difference video signal; A variable length encoding unit 110 for variable length encoding the quantized image data provided from the quantization unit into codes corresponding to run lengths and levels; A buffer (120) for temporarily storing the variable length encoded image data and transmitting the same at a fixed bit rate; An energy detector 130 which detects energy of a current frame image signal of a predetermined band, a motion compensated image signal, and a difference image signal; The difference between the quantization step size of the immediately preceding frame on the time axis of the current frame provided from the quantization unit 100 and the bit generation amount of the previous frame provided from the buffer 120 and the target bit generation amount for the previous frame. A first quantization step calculator 140 for calculating a first quantization step size based on the first quantization step calculator 140; A bit generation proportional coefficient calculation unit 150 that calculates a proportional coefficient of the current frame with respect to a bit generation amount based on an energy magnitude of the difference image provided from the energy detector 130 and the first calculated quantization step size; Calculate a new second quantization step based on the proportional coefficient of the current frame and the previously calculated proportional coefficient of the previous frame provided from the bit generation proportional coefficient calculating unit 150, and input the calculated second quantization step into the input And a band division code consisting of a second quantization step calculating section (160) provided to the quantization section (100) as a quantization step of a video signal. 제1항에 있어서, 상기 1차 양자화 스텝 크기는, 하기의 식에 의해 산출되는것을 특징으로하는 대역분할부호화시스템의버퍼제어 장치.The buffer control apparatus of a band division coding system according to claim 1, wherein the first quantization step size is calculated by the following equation. STT=STO· STT = STO (상기 식에서, STT는 현재 프레임의 1차 양자화 스텝 크기, STO는 이전 프레임의 양자화 스텝 크기, Bg는 이전 프레임에서발생한비트량, Bt는 이전 프레임의 목표비트 발생량을 각각 의미함.)(In the above equation, STT is the first quantization step size of the current frame, STO is the quantization step size of the previous frame, B g is the amount of bits generated in the previous frame, and B t is the target bit generation amount of the previous frame.) 제2항에 있어서, 상기 비트 발생량에 대한 비례 계수는, 하기의 식에 의해 산출되는 것을 특징으로 하는 대역 분할 부호화 시스템의 버퍼 제어 장치.The apparatus of claim 2, wherein the proportional coefficient with respect to the bit generation amount is calculated by the following equation. EQR= EQR = (상기 식에서, EQR는 비례 계수, E는 차이 영상에 대한 에너지 크기를 각각 의미함.)(Equation 2 above, EQR is proportional coefficient and E is energy magnitude for difference image.) 제3항에 있어서,상기 2차 양자화 스텝은, 하기의 식에 의해 산출되는 것을 특징으로 하는 대역 분할 부호화 시스템의 버퍼 제어 장치.The buffer control device of the band division coding system according to claim 3, wherein the second quantization step is calculated by the following equation. ST=STT· ST = STT (상기 식에서, ST는 2차 양자화 스텝 크기, EQR‡W는 현재 프레임 비례,EQRold는 이전 프레임의 비례 계수를 각각 의미함 )Where ST is the second quantization step size, EQR ‡ W is the current frame proportional, and EQR old is the proportional coefficient of the previous frame, respectively. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950055651A 1995-12-23 1995-12-23 Buffer controlling apparatus of subband coding system KR100220677B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100529305B1 (en) * 1999-03-13 2005-11-17 삼성전자주식회사 Bitrate control method and apparatus of image encoder and encoding method therefor
KR100644570B1 (en) * 1999-10-01 2006-11-13 삼성전자주식회사 Bitrate control method and apparatus of image encoder and encoding method therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100529305B1 (en) * 1999-03-13 2005-11-17 삼성전자주식회사 Bitrate control method and apparatus of image encoder and encoding method therefor
KR100644570B1 (en) * 1999-10-01 2006-11-13 삼성전자주식회사 Bitrate control method and apparatus of image encoder and encoding method therefor

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