System for detecting difference between image on primary sheet a

Details System for detecting difference between image on primary sheet a System for detecting difference between image on primary sheet a

1985-05-06

1988-05-24

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

340715, 382 8, G06H 900

Patent

active

047471468

ABSTRACT:
There is disclosed a system for detecting a difference between an image on a primary sheet and an image on a secondary sheet. A microprocessor unit determines whether corresponding ones of first and second image elements representative respectively of the images on the primary and secondary films differ in optical density from each other below a predetermined level. The two corresponding first and second image elements different above the predetermined level are emphasized in optical density difference and alternately displayed on a display screen at a short time interval, so that the dot of the display screen which alternately display these image elements is caused to flicker.

REFERENCES:
patent: 4495491 (1985-01-01), Postl
patent: 4521774 (1985-06-01), Murphy
patent: 4578770 (1986-03-01), Mitani
patent: 4626101 (1986-12-01), Ogawa et al.
patent: 4641353 (1987-02-01), Kobayashi
patent: 4646252 (1987-02-01), Terashita
patent: 4651341 (1987-03-01), Nakashima et al.

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