Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-01-10
1987-03-17
Broome, Harold
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358105, 358167, H04N 712
Patent
active
046512063
ABSTRACT:
An inter-frame coding circuit for encoding a television video signal to reduce the quantity of data to be transmitted. The coding circuit includes a motion detection circuit which produces a motion vector representative of motion contained in the television signal and an inter-frame prediction coder which is responsive to the motion vector and to the input television signal to produce a prediction error signal which indicates frame-to-frame variations in the television signal. Also included is a refresh circuit for spatially correlating the input signal on an intra-frame basis. To reduce or eliminate the possibility that an error in the signal is magnified, the motion vector is set to zero for a predetermined period in relation to an area or a portion of the video signal for which a refresh operation has just been completed. A transmission circuit transmits the motion vector signal, the prediction error signal, and a refresh execution signal which are used for reproducing the original video signal. A counterpart decoding circuit for receiving the transmitted signals and reproducing from them the original video signal is provided.
REFERENCES:
patent: 4232338 (1980-11-01), Netravali et al.
patent: 4255763 (1981-03-01), Maxemchuk et al.
patent: 4270143 (1981-05-01), Morris
patent: 4307420 (1981-12-01), Ninomiya et al.
Broome Harold
Foster Patrick W.
NEC Corporation
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