Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-02-02
1983-06-21
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358133, 358240, H04N 712
Patent
active
043896723
ABSTRACT:
A pseudo-gray scale signal obtained by comparing the intensity values of elements of a picture with a series of spatially dependent threshold values is processed for display on a multilevel device. Generally, an estimate of the intensity value of each pel is formed as a joint function of the display words which make up the pseudo-gray scale signal and an indication of the threshold value associated with the pel. In one embodiment, the display words and threshold values are used to select appropriate stored intensity values obtained from representative pictures. Alternatively, the estimates are derived recursively using display words and threshold values for a neighborhood near the pel being processed.
REFERENCES:
patent: 3953668 (1976-04-01), Judice
patent: 3976826 (1976-08-01), Fulton, Jr.
patent: 3997719 (1976-12-01), Judice
patent: 4124870 (1978-11-01), Schatz
patent: 4255763 (1981-03-01), Maxemchuk et al.
patent: 4266249 (1981-05-01), Chai et al.
Techniques for Coding Dithered Two-Level Pictures, by Netravali, The Bell System Technical Journal, vol. 56, No. 5, May-Jun. 1977, pp. 809-819.
Bowen Edward G.
Netravali Arun N.
Bell Telephone Laboratories Incorporated
Chin Tommy P.
Freedman Barry H.
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