Conversion to a two-valued video signal

Details Conversion to a two-valued video signal Conversion to a two-valued video signal

1983-03-17

1986-03-11

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, H04N 140

Patent

active

045757682

ABSTRACT:
A system for converting an analog video signal obtained by scanning an original image to be processed into a two-valued video signal such as an input portion of a facsimile machine includes a peak/valley extracting circuit for extracting peaks and valleys in the analog video signal before thresholding the analog video signal so as to determine an optimal threshold level to be used in thresholding. The peak/valley extracting circuit includes peak and valley thresholds in addition to the threshold to be used in thresholding the analog video signal to produce a two-valued video signal. The peak/valley extracting circuit is so structured to supply a peak/valley extraction signal if an extracted peak or valley also satisfies the condition that it is equal to or higher or lower in level than the peak or valley threshold.

REFERENCES:
patent: 3534334 (1970-10-01), Bartz et al.
patent: 3723649 (1973-03-01), Pitegoff et al.
patent: 3763357 (1973-10-01), Morton
patent: 4251837 (1981-02-01), Janeway

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