Image sensor

Details Image sensor Image sensor

1982-09-17

1986-02-04

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

307516, 307526, 328134, 356 5, G06K 714, G01C 308

Patent

active

045690782

ABSTRACT:
An image sensor for generating multi-bit digital pixel values for analyses in a digital image processor. A phase detector is utilized for detecting the relative phase difference between a modulation reference waveform for modulating a light source and the reflected information waveform from the illuminated target area. A high speed digital counter is driven by a phase locked loop frequency multiplier. The counter is enabled and reset by digital logic levels derived from the reference and signal waveforms. A latch is provided to store the count on the counter output when the counter is reset to thereby provide a multi-bit digital pixel value representative of characteristics of the target being sensed.

REFERENCES:
patent: 3652784 (1972-03-01), Wupper et al.
patent: 3779645 (1973-12-01), Nakazawa et al.
patent: 3852579 (1974-12-01), Sohn et al.
patent: 3941982 (1976-03-01), Knollenberg et al.
patent: 4297030 (1981-10-01), Chaborski
patent: 4400664 (1983-08-01), Moore

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