Video-to-binary conversion apparatus having moire suppression ch

Details Video-to-binary conversion apparatus having moire suppression ch Video-to-binary conversion apparatus having moire suppression ch

1975-03-21

1976-06-22

Britton, Howard W.

Telegraphy

Systems

Simplex-reversing periodic

178DIG3, H04N 140

Patent

active

039652904

ABSTRACT:
Video-to-binary conversion apparatus for use in image reproduction systems and the like to convert an input video signal to an output binary signal and comprising an output data normalizer for normalizing the binary output data signal relative to the input binary signal, an integrator for integrating the difference between the input video signal and the normalized output data signal and for developing an adaptable, data state determining threshold signal commensurate therewith, and a comparator for comparing the input video signal to the adaptive threshold signal to develop a binary output data signal which corresponds to the input video signal. The circuit electronically compensates for small signal errors which would otherwise occur in the transformation of the scan data from analog-to-binary form and which would give rise to a moire degradation in the reproduced image.

REFERENCES:
patent: 3649751 (1972-03-01), So
patent: 3715722 (1973-02-01), Hall
patent: 3868477 (1975-02-01), Katzman
patent: 3882270 (1975-05-01), Ogawa

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