KR920702157A - Video Phone System - Google Patents

Video Phone System

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Publication number
KR920702157A
KR920702157A KR1019910700999A KR910700999A KR920702157A KR 920702157 A KR920702157 A KR 920702157A KR 1019910700999 A KR1019910700999 A KR 1019910700999A KR 910700999 A KR910700999 A KR 910700999A KR 920702157 A KR920702157 A KR 920702157A
Authority
KR
South Korea
Prior art keywords
image
difference signal
pixel
signal
luminance difference
Prior art date
Application number
KR1019910700999A
Other languages
Korean (ko)
Inventor
엘 하베이 로버트
알 허슐러 마첸도 패트릭
제이 시폴 데이빗
씨 큐믈러 키프톤
Original Assignee
원본미기재
매사츄세츠 인스티튜트 오브 테크놀로지
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Application filed by 원본미기재, 매사츄세츠 인스티튜트 오브 테크놀로지 filed Critical 원본미기재
Publication of KR920702157A publication Critical patent/KR920702157A/en

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/15—Conference systems
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/25—Management operations performed by the server for facilitating the content distribution or administrating data related to end-users or client devices, e.g. end-user or client device authentication, learning user preferences for recommending movies
    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/2662—Controlling the complexity of the video stream, e.g. by scaling the resolution or bitrate of the video stream based on the client capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
    • H04N21/6137—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a telephone network, e.g. POTS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/61—Network physical structure; Signal processing
    • H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
    • H04N21/6187—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a telephone network, e.g. POTS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/04—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier
    • H04N7/045—Systems for the transmission of one television signal, i.e. both picture and sound, by a single carrier the carrier being frequency modulated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal

Abstract

내용 없음No content

Description

비데오전화시스템Video Phone System

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

제1도는 본 발명에 따른 흑백 비데오전화시스템의 블럭다이아그램, 제2도는 본 발명에 따른 칼라비데오전화시스템의 블럭다이아그램, 제3도는 제1도의 송신부에 사용되는 영상처리모듈의 보다 상세한 개략 다이아그램.1 is a block diagram of a black and white video telephone system according to the present invention, FIG. 2 is a block diagram of a color video telephone system according to the present invention, and FIG. 3 is a more detailed schematic diagram of an image processing module used in the transmitter of FIG. gram.

Claims (23)

영상데이타압축을 위한 신호처리장치에 있어서, 영상값으로부터 유도된 축소그레이스케일영상을 기억시키기 위한 기억수단, 현재 영상 프레임의 축소그레이스케일영상을 기억시키기 위한 기억수단, 현재 영상 프레임의 축소그레이스케일영상을 상기기억수단으로부터의 기준영상과 비교하고 그레이스케일값이 선행영상프레임과 현재 영상프레임 사이에서 변화된 픽셀위치를 나타내는 휘도차이신호를 발생하기 위한 비교수단과 상기 차이신호를 부호화하는 부호화 수단으로 구성됨을 특징으로 하는 비데오전화시스템.A signal processing apparatus for compressing image data, comprising: memory means for storing a reduced grayscale image derived from an image value, memory means for storing a reduced grayscale image of a current video frame, and a reduced grayscale image of a current video frame Is compared with a reference image from the storage means, and comparison means for generating a luminance difference signal representing a pixel position whose grayscale value has changed between the preceding image frame and the current image frame, and encoding means for encoding the difference signal. Video phone system characterized by. 청구범위 1항에 있어서, 이 시스템에 영상프레임의 각 픽셀을 나타내는데 유용한 그레이레벨의 수를 줄이기 위한 그레이 스케일 축소수단이 구성되어 있음을 특징으로 하는 시스템.The system according to claim 1, wherein the system is configured with gray scale reduction means for reducing the number of gray levels useful for representing each pixel of an image frame. 청구범위 2항에 있어서, 그레이스케일축소수단에 다중 그레이스케일영상을 반명암영상으로 전환시키는 혼합한계수단이 구성되어 있음을 특징으로 하는 시스템.The system according to claim 2, wherein the gray scale reduction means comprises a mixing limit means for converting multiple grayscale images into half-darkness images. 청구범위 3항에 있어서, 혼합한계수단이 각 픽셀에 적용된 한계값이 픽셀값의 토글링을 줄이기 위하여 수정되는 히스테리시스조절로 구성됨을 특징으로 하는 시스템.The system according to claim 3, wherein the mixing limit means consists of hysteresis adjustment in which the limit value applied to each pixel is modified to reduce the toggling of the pixel value. 청구범위 4항에 있어서, 이 시스템에 히스테리시스조절을 변화시키기 위한 수단이 구성됨을 특징으로 하는 시스템.The system of claim 4, wherein the system is configured with means for altering hysteresis control. 청구범위 1항에 있어서, 부호화수단에 부호방식으로 일련의 반복된 차동영상데이타비트를 나타내어 상기 기다란 열의 비트가 소수의 비트로 표시되도록하는 런-렝스부호화 수단이 구성되어 있음을 특징으로 하는 시스템.A system according to claim 1, characterized in that the run-length encoding means is arranged so that the encoding means represents a series of repeated differential image data bits in a coded manner so that the bits of the elongated column are represented by a few bits. 청구범위 1항에 있어서, 이 시스템에 반송신호를 송신을 위한 부호화된 휘도차이신호로 변조하는 변조수단이 구성되어 있음을 특징으로 하는 시스템.A system according to claim 1, characterized in that the system comprises modulation means for modulating the carrier signal into an encoded luminance difference signal for transmission. 청구범위 7항에 있어서, 변조수단에 오디오 신호를 상기 휘도차이신호와 다중화하기 위한 수단이 구성되어 있음을 특징으로 하는 시스템.8. The system according to claim 7, wherein means for multiplexing an audio signal with said luminance difference signal is provided in a modulation means. 청구범위 7항에 있어서, 변조수단에 크러미넌스신호를 상기 휘도차이 신호와 다중화하기 위한 수단이 구성되어 있음을 특징으로 하는 시스템.8. The system according to claim 7, wherein means for multiplexing a luminance signal with said luminance difference signal is provided in a modulation means. 청구범위 1항에 있어서, 이 시스템이 연속영상프레임의 모션정도를 측정하여 이러한 측정에 응답하여 해상도를 수정하기 위한 적응 분해 수단을 포함함을 특징으로 하는 시스템.The system according to claim 1, wherein the system comprises adaptive decomposition means for measuring the degree of motion of the continuous image frame and correcting the resolution in response to this measurement. 압축영상데이타로부터 영상을 복호하여 조립하는 신호처리장치에 있어서, 축소그레이스케일 영상의 변화를 나타내는 차이신호를 복호하기 위한 차동영상복호유니트와, 먼저 기억된 영상에 상기 복호된 차이신호를 부가하므로서 먼저 기억된 영상에 대한 변화를 갱신하기 위한 영상 갱신유니트로 구성됨을 특징으로 하는 시스템.A signal processing apparatus for decoding and assembling an image from compressed image data, comprising: a differential image decoding unit for decoding a difference signal representing a change in a reduced grayscale image, and first adding the decoded difference signal to a stored image first; And an image update unit for updating a change to a stored image. 청구범위 11항에 있어서, 상기 갱신영상의 그레이 레벨수를 증가시키기 위하여 픽셀값의 블럭을 평균하기 위한 영상평균유니트가 구성되어 있음을 특징으로 하는 시스템.12. The system according to claim 11, characterized in that an image average unit is arranged for averaging blocks of pixel values in order to increase the number of gray levels of the updated image. 청구범위 11항에 있어서, 보간법으로 보다 상세한 영상을 얻기 위한 영상보간유니트가 구성되어 있음을 특징으로 하는 시스템.12. The system according to claim 11, characterized in that an image interpolation unit is configured for obtaining a more detailed image by interpolation. 청상데이타 압축을 위한 신호처리 방법에 있어서, 이 방법이 영상값으로 부터 유도된 축소그레이스케일 영상을 기억시키는 단계, 현재의 영상프레임의 축소그레이스케일영상을 사전에 기어된 기준그레이 스케일영상과 비교하는 단계, 그레이스케일이 선행영상프레임과 현재 영상프레임 사이에서 변화된 픽셀위치를 나타내는 휘도차이신호를 발생하는 단계와, 상기 차이신호를 부호화하는 단계로 구성됨을 특징으로 하는 신호처리방법.A signal processing method for compressing auditory data, the method comprising: storing a reduced grayscale image derived from an image value, comparing a reduced grayscale image of a current image frame with a reference gray scale image previously geared; And generating a luminance difference signal representing a pixel position whose grayscale has changed between the preceding video frame and the current video frame, and encoding the difference signal. 청구범위 14항에 있어서, 기억 및 비교전에 영상프레임의 각 픽셀을 나타내는데 유용한 그레이레벨수를 축소시키는 단계가 구성되어 있음을 특징으로 하는 방법.A method according to claim 14, characterized in that the step of reducing the number of gray levels useful for representing each pixel of the image frame before storing and comparing is configured. 청구범위 15항에 있어서, 그레이레벨수의 축소단계에 다중그레이스케일영상을 반명암영상으로 전환하는 단계가 구성되어 있음을 특징으로 하는 방법.16. The method of claim 15, wherein the step of reducing the number of gray levels comprises converting the multi-grayscale image into a half-dark image. 청구범위 15항에 있어서, 그레이 레벨수의 축소단계에 혼합한계값을 각 픽셀의 휘도값과 비교하는 단계와, 픽셀을 비교값에 기초한 축소그레이스케일 값으로 설정하는 단계가 구성되어 있음을 특징으로 하는 방법.The method according to claim 15, characterized in that the step of reducing the number of gray levels comprises comparing the mixing limit value with the luminance value of each pixel, and setting the pixel to a reduced grayscale value based on the comparison value. How to. 청구범위 17항에 있어서, 혼합한계값을 비교하는 단계가 픽셀값의 토글링을 줄이기 위하여 상기 한계값에 대한 히스테리시스 조절을 적용하는 단계로 구성됨을 특징으로 하는 방법.18. The method of claim 17, wherein comparing the blend limits comprises applying hysteresis adjustment to the limits to reduce toggling of pixel values. 청구범위 18항에 있어서, 비교단계를 지연시키기 위하여 히스테리시스조절을 변화시키는 단계가 구성되어 있음을 특징으로 하는 방법.20. The method of claim 18, wherein the step of varying the hysteresis control is configured to delay the comparison step. 청구범위 14항에 있어서, 휘도차이신호를 부호화하는 단계에 상기 신호의 런-렝스부호화 단계가 구성되어 있는 공통으로 반복된 열의 영상데이타비트가 짧은 부호어로 설정됨을 특징으로 하는 방법.15. The method of claim 14, wherein the encoding of the luminance difference signal comprises setting a short codeword of image data bits of a commonly repeated sequence in which run-length encoding of the signal is configured. 청구범위 14항에 있어서, 반송신호를 송신을 위한 부호화된 휘도차이 신호로 변조하는 단계가 구성되어 있음을 특징으로 하는 방법.A method according to claim 14, characterized in that the step of modulating the carrier signal into an encoded luminance difference signal for transmission. 청구범위 14항에 있어서, 변조단계에 오디오신호를 상기 휘도차이 신호와 다중화하는 단계가 구성되어 있음을 특징으로 하는 방법.15. The method of claim 14, wherein the modulating step comprises multiplexing an audio signal with the luminance difference signal. 청구범위 14항에 있어서, 부호화된 휘도차이 신호의 변화 정도를 측정하는 단계와 그 변화정도에 기초한 차이비교를 수행하는 단계가 구성되어 있음을 특징으로 하는 방법.A method according to claim 14, characterized in that it comprises the steps of measuring the degree of change of the encoded luminance difference signal and performing the difference comparison based on the degree of change. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910700999A 1989-12-28 1990-12-26 Video Phone System KR920702157A (en)

Applications Claiming Priority (3)

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US45828289A 1989-12-28 1989-12-28
PCT/US1990/007649 WO1991010328A1 (en) 1989-12-28 1990-12-26 Video telephone systems
US458282 1999-12-10

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JPH04505537A (en) 1992-09-24
WO1991010328A1 (en) 1991-07-11
AU650256B2 (en) 1994-06-16
EP0462261A1 (en) 1991-12-27
CA2048623A1 (en) 1991-06-29
WO1991010324A1 (en) 1991-07-11
AU7166491A (en) 1991-07-24

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