Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-03-05
1987-12-01
Goldberg, E. A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, 358138, 375122, H04N 712, H04B 166
Patent
active
047108100
ABSTRACT:
A video signal compression circuit for encoding a video signal to reduce the quantity of video information that is transmitted without loss of information and a video signal decompressing circuit for recovering the video signal from its compressed coded form. The encoding circuit includes means for detecting the motion contained in the video signal to generate motion vectors which are representative of this motion. Each picture frame produced from the transmitted video signal is divided into many block units. The motion vectors are generated according to the order of the block units rather than according to the order in which the video signal is transmitted. Thereafter, the vectors are reconverted to the order of the input video signal. The input video signal and the converted motion vectors are used for generating a prediction error signal which indicates motion in the video signal. The prediction error signal is encoded using a variable length coding scheme. On the receiving end, a decoding circuit is used for reproducing the original video signal. The decoding circuit includes means for decoding the output of the coding means on the transmitter side to reproduce the prediction error signal. The reproduced prediction error signal is converted into an appropriate time sequence which matches that of the input video signal and then the input video signal is reproduced in response to the reconverted prediction error signal and the motion vectors which are received from the transmitter.
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patent: 4371895 (1983-02-01), Koga
patent: 4460923 (1984-07-01), Hirano et al.
patent: 4533957 (1985-08-01), Iinuma
Foster Patrick W.
Goldberg E. A.
NEC Corporation
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