Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-11-13
1993-04-27
Kostak, Victor R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358426, H04N 712
Patent
active
052067254
ABSTRACT:
On the coding side of the apparatus, an image signal is divided into an upper signal for coarsely designating a level of the image signal and a lower signal for finely designating the level of the image signal. The upper signal is then coded. A reference signal for coding the lower signal is selected. The lower signal is coded by referring to the selected reference signal. The coded upper and the lower signals are synthesized, and the synthesized code is output as a code corresponding to the image signal. On the decoding side of the apparatus, the synthesized code is decoded into a code corresponding to the upper signal and a code corresponding to the lower signal. The code corresponding to the upper signal is decoded into an upper signal. A reference signal for decoding the code corresponding to the lower signal is selected. The code corresponding to the lower signal is decoded into a lower signal by referring to the selected signal. The decoded upper and lower signals are synthesized to obtain the image signal.
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Peter Pirsch et al., "Statistical analysis and coding of color video signals", ACTA Electronica, 19, 4, 1976, pp. 277-287.
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Shigeo Kato et al., "An Efficient Coding For Multi-Level Facsimile Images with Arithmetic Coding", The Journal of The Institute of Image Electronics Engineers of Japan, vol. 12 No. 3, 1983, pp. 219-226.
Kostak Victor R.
NEC Corporation
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