Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-09-21
1988-12-20
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, H04N 7133, H04N 7137
Patent
active
047928514
ABSTRACT:
An encoder in an encoder/decoder system includes a circuit for orthogonally transforming an input image signal, a circuit for receiving the input image signal, judging which orthogonal transformation coefficient is to be omitted and which orthogonal transformation coefficient is to be interframe-coded, and outputting a judgement result as mode information, and a circuit for receiving an output signal from the orthogonal transformation circuit, omitting the orthogonal transformation coefficient according the mode information, and outputting a coded image signal. In a decoder in the encoder/decoder system, the orthogonal transformation coefficient is omitted on the basis of the mode information sent from the encoder, thereby decoding the image signal.
REFERENCES:
patent: 4704628 (1987-11-01), Chen
patent: 4707738 (1987-11-01), Ferre
IEEE Transactions on Communications, vol. COM-33, pp. 1291-1302, Dec. 1985.
2nd International Technical Symposium on Optical and Electro Optical Applied Science and Engineering, SPLE Conf. B594, Image Coding, Dec. 1985.
IEEE Transaction on Communications, vol. COM-25, pp. 1329-1339, Nov. 1977.
Britton Howard W.
NEC Corporation
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