Image processing apparatus

Details Image processing apparatus Image processing apparatus

1990-06-27

1991-11-12

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

346108, 358296, 358447, G06K 900, G01D 942

Patent

active

050654411

ABSTRACT:
An image processing apparatus for processing an image signal, comprising a clock for generating a periodical clock signal, a pattern signal generator for generating 2N (where N is a positive integer) pattern signals, each of the pattern signals having a constant wave-form, a wave length of 2N times longer than that of the periodical clock signal and a phase difference 360/2N relative to another one of the pattern signals, a comparator for comparing the pattern signals with the image signal and for generating 2N of comparison signals, and a composition generator for combining said 2N comparison signals and for generating a pulse-duration modulated signal from the combined 2N comparison signals.

REFERENCES:
patent: 4763199 (1988-08-01), Suzuki
patent: 4811037 (1989-03-01), Arai
patent: 4864326 (1989-09-01), Kawamura et al.
patent: 4864419 (1989-09-01), Saito et al.

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