KR960033094A - Variable bitrate coding method and apparatus for image information - Google Patents

Variable bitrate coding method and apparatus for image information Download PDF

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Publication number
KR960033094A
KR960033094A KR1019950002784A KR19950002784A KR960033094A KR 960033094 A KR960033094 A KR 960033094A KR 1019950002784 A KR1019950002784 A KR 1019950002784A KR 19950002784 A KR19950002784 A KR 19950002784A KR 960033094 A KR960033094 A KR 960033094A
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South Korea
Prior art keywords
quantization step
activity
coded
quantization
recording
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KR1019950002784A
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Korean (ko)
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KR100214578B1 (en
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김병진
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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
    • H04N19/147—Data rate or code amount at the encoder output according to rate distortion criteria
    • 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
    • H04N19/48—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using compressed domain processing techniques other than decoding, e.g. modification of transform coefficients, variable length coding [VLC] data or run-length data

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

Abstract

본 발명은 비디오디스크플레이어(VDP) 에서 고밀도로 압축된 영상신호를 기록하거나 재생할 때 가변비트레이트 방식으로 코딩하는 기술에 관한 것으로, 일반적인 영상정보의 코딩방법에 있어서는 디스크면적으로 주어지는 저장 가능한 데이타의 총량과 디코딩하고자 하는 화상의 재생시간동안 일정한 화질을 얻기 위해 2스텝코딩방법을 사용하게 되므로 엔코딩을 수행하기 위해서는 두번의 코딩과정을 필요로하게 되고, 이로인하여 실시간으로 코딩을 할 수 없게 되는 결함이 있었는 바, 본 발명은 이를 해결하기 위하여, 발생된 데이타량을 근거로 하여 향후 코딩할 화상의 양자화 스텝 크기를 결정하는 한편, 초과 또는 부족한 데이타에 대해 남은 시간동안 평균적으로 보상할 양자화스텝 크기 세밀도와 액티비티의 기울기를 결정화하도록 하였다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique of coding in a variable bit rate method when recording or playing back a high density compressed video signal in a video disc player (VDP). Since the two-step coding method is used to obtain a constant picture quality during the reproduction time of the picture to be decoded, two coding steps are required to perform encoding, which causes a defect that cannot be coded in real time. In order to solve this problem, the present invention determines the quantization step size of an image to be coded in the future based on the amount of data generated while quantizing step size detail and activity to compensate on average for the remaining time for excess or insufficient data. The slope of was allowed to crystallize.

Description

영상정보의 가변비트레이트 코딩 방법 및 장치Variable bitrate coding method and apparatus for image information

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

제2도는 본 발명 영상정보의 가변비트레이트 코딩장치에 대한 블록도2 is a block diagram of a variable bit rate coding apparatus of video information according to the present invention.

제3도는 본 발명에서 액티비티와 양자화스텝과의 관계를 보인 그래프3 is a graph showing the relationship between an activity and a quantization step in the present invention.

제4도는 본 발명에 적용된 양자화스텝 결정기를 설명하기 위한 파형도4 is a waveform diagram for explaining a quantization step determiner applied to the present invention.

Claims (2)

디지털변환된 영상입력을 디씨티 변환하고, 양자화 처리하 후 가변장 형식으로 코딩하여 출력하는 방법에 있어서, 발생된 데이타량을 근거로 하여 향후 코딩할 화상의 양자화 스텝 크기를 결정하는 제1단계와, 초과 또는 부족한 데이타에 대해 남은 시간동안 평균적으로 보상할 양자화스텝 크기 세밀도와 액티비티의 기울기를 결정하는 제2단계를 포함하여 이루어지는 것을 특징으로 하는 영상정보의 가변비트레이트 코딩 방법.1. A method of outputting a digitally converted video input by DC conversion, quantization processing, and then coding in a variable length format, the method comprising: determining a quantization step size of an image to be coded later based on the amount of data generated; And a second step of determining the quantization step size fineness and the slope of the activity to be compensated on average for the remaining time for the excess or insufficient data. 압축한 영상을 기록하거나 재생하는 영상신호의 기록/재생장치의 코드량계산기로부터 평균 비트레이트값이 입력될 때, 마이크로컴퓨터로부터 디스크의 기록용량과 코딩할 기록시간을 입력받아 평균비트레이트를 결정하는 양자화스텝 결정기(13)와, 상기 양자화스텝 결정기(13)에서 출력되는 평균비트레이트에 대응되는 액티비티와 양자화스텝 크기 세밀도의 관계를 선택하는 양자화스텝 선택기(14)와, 복잡도를 표현하는 액티비티와 양자화스텝의 크기와의 관계를 여러가지로 분류하여 저장하고 있다가 상기 양자화스텝 선택기(14)에서 선택된 액티비티에 대한 양자화스텝 크기의 기울기에 해당되는 테이블값을 출력하는 양자화스텝 저장 테이블(15)과, 상기 양자화스텝 저장테이블(15)로부터 테이블값을 공급받고, 액티비티 검출기(1)로부터 입력되는 액티비티값에 따라 가변적으로 양자화 스텝을 결정하여 가변비트레이트 코딩이 이루어지도록 양자화기(5)에 제어신호를 출력하는 양자화 제어기(16)와, 가변장 코딩기(6)에서 출력되는 코딩된 영상출력(Code Output)을 공급받아 평균비트 레이트를 계산하는 코드량 계산기(17)를 포함하여 구성한 것을 특징으로 하는 영상정보의 가변비트레이트 코딩장치.When the average bitrate value is input from the code amount calculator of the recording / reproducing apparatus for recording or reproducing the compressed image, the average bitrate is determined by receiving the recording capacity of the disc and the recording time to be coded from the microcomputer. A quantization step determiner 13, a quantization step selector 14 for selecting a relationship between an activity corresponding to the average bitrate output from the quantization step determiner 13, and a quantization step size detail, an activity for expressing complexity and A quantization step storage table 15 for storing various kinds of relations with the magnitude of the quantization step, and outputting a table value corresponding to the slope of the quantization step size with respect to the activity selected by the quantization step selector 14; The table value is supplied from the quantization step storage table 15 and input from the activity detector 1. The quantization controller 16 outputs a control signal to the quantizer 5 so that the variable bit rate coding is performed by varying the quantization step according to the titer value, and the coded image output output from the variable length coder 6. And a code amount calculator (17) for calculating an average bit rate by receiving (Code Output). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950002784A 1995-02-15 1995-02-15 Real time variable bit rate encoding method and apparatus of image information KR100214578B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100234247B1 (en) * 1995-05-29 1999-12-15 윤종용 Apparatus for encoding moving picture of variable bit rate
KR100437900B1 (en) * 1996-12-24 2004-09-04 엘지전자 주식회사 Voice data restoring method of voice codec, especially in relation to restoring and feeding back quantized sampling data to original sample data
KR100468726B1 (en) * 2002-04-18 2005-01-29 삼성전자주식회사 Apparatus and method for performing variable bit rate control in real time

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100234247B1 (en) * 1995-05-29 1999-12-15 윤종용 Apparatus for encoding moving picture of variable bit rate
KR100437900B1 (en) * 1996-12-24 2004-09-04 엘지전자 주식회사 Voice data restoring method of voice codec, especially in relation to restoring and feeding back quantized sampling data to original sample data
KR100468726B1 (en) * 2002-04-18 2005-01-29 삼성전자주식회사 Apparatus and method for performing variable bit rate control in real time

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