Method of and apparatus for processing image signal

Details Method of and apparatus for processing image signal Method of and apparatus for processing image signal

1991-04-19

1991-11-12

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358443, 358448, H04N 140

Patent

active

050652567

ABSTRACT:
An image signal is processed to grain digital image data by comparing digital random number data generated on the M-sequence coding theory and the digital image data with a binarizing digital comparator, and employing a signal produced by the comparison as grained binarized image data. The digital random number data are produced by a digital random number data generator comprising a random number generating circuit based on the M-sequences coding theory and an initial value presetting circuit for setting an initial value in said random number generating circuit.

REFERENCES:
patent: 3916096 (1975-10-01), Everett et al.
patent: 4340912 (1982-07-01), Troxel
patent: 4394662 (1983-07-01), Yoshida et al.
patent: 4450485 (1984-05-01), Oshikoshi et al.
patent: 4550431 (1985-10-01), Werth et al.
Halftone Image Produced by Pseudo-Random Bit Generator; G. L. Smith; IBM Tech Bull; vol. 17; #7; pp. 1858-1859; 12/74.
"Generalized Feedback Shift Register Pseudorandom Number Algorithm", Lewis and Payne, Jour. Assoc. for Computing Machinery, vol. 20, No. 8, Jul. 1973, pp. 456-468.

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