Video signal binary-coding apparatus and method

Details Video signal binary-coding apparatus and method Video signal binary-coding apparatus and method

1988-11-07

1990-01-23

Picard, Leo P.

Image analysis

Histogram processing

For setting a threshold

358464, G06K 940

Patent

active

048963658

ABSTRACT:
A binary-coding which is effected converts a video signal into binary-coded outputs corresponding to white and black. More particularly, the binary-coding method and apparatus produces a black peak signal by following the black peak of a video signal, and makes a determination based on this black peak signal and video signal as to whether or not the video signal is rich in the black components so as to provide a binary slice select reference signal which takes the H level when the video signal is rich in the black components, holds the slice select reference signal for several scans in the vertical direction and for several bits in the horizontal direction, selects a binary-coded waveform obtained by slicing the video signal at a predetermined slice level when at least one among the slice select reference signals held is found at the level H indicating that the video signal is rich in black components, and outputs it as binary-coded output. Accordingly, a binary-coding method and apparatus is provided wherein when any hand-written or printed dark characters or the like are detected as a video signal and are binary-coded into white and black levels, the binary-coded output can be reproduced without being smudged or fuzzed dark.

REFERENCES:
patent: 4674126 (1987-06-01), Kotera
patent: 4675909 (1987-06-01), Egami et al.

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