Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1987-07-10
1988-08-23
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358260, 358261, 358282, H04N 141, H04N 1415, H04N 1417
Patent
active
047664991
ABSTRACT:
On the transmitting side of a facsimile system, a predictive picture signal x.sub.ij of a pel (i, j) is obtained, taking account of predictive picture signals of pels prior to the pel (i, j), which have been previously obtained. A two-level transposition signal d.sub.ij is determined in accordance with the predetermined on the basis of an actual picture signal x.sub.ij, the predictive picture signal x.sub.ij and a dither threshold t.sub.ij. The thus obtained transposition signal d.sub.ij is encoded by use of the MH or MR coding method and transmitted to a receiving side of the facsimile system. Compared with the conventional case, in which a dither signal z.sub.ij itself is encoded and transmitted, the transposition signal d.sub.ij can be considerably compressed, when it is encoded for transmission by use of the MH or MR coding method.
REFERENCES:
patent: 4084196 (1978-04-01), Tisue
patent: 4559563 (1985-12-01), Joiner
patent: 4677571 (1987-06-01), Riseman
Omachi et al., "Modified Huffman Coding for Half-Tone Pictures," IEEE International Conference on Communications, Chicago, Jun. 23-26, 1985, Conference Record ICC85, pp. 1410-1414.
Britton Howard W.
Hitachi , Ltd.
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