Method and apparatus for automatically recognizing photographic

Details Method and apparatus for automatically recognizing photographic Method and apparatus for automatically recognizing photographic

1978-11-29

1980-12-16

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, 250559, 356444, G03B 2752, G01N 2159

Patent

active

042393841

ABSTRACT:
A negative whose printability is to be automatically ascertained is subdivided into a central zone, a foreground zone, and a background zone. Whole-zone density signals are produced for the foreground and background zones, and the central zone is scanned to generate a maximum-density signal indicating the density of the maximum-density point within the central zone. The negative is rejected for being underexposed when both of two conditions are met: first, the larger of the foreground and background whole-zone density signals fails to exceed a first limit value; and second, the difference between the central-zone maximum-density signal, on the one hand, and the smaller of the foregound and background whole-zone density signals, on the other hand, fails to exceed a second limit value. The negative is rejected as overexposed when the average of the foreground and background whole-zone density signals fails to exceed a third limit value, irrespective of the density of the central zone. The negative is rejected as containing a meaningless motif, e.g., an adhesive sticker applied to the negative, when the central-zone maximum-density signal exceeds a fourth limit value, the density corresponding to the fourth limit value being higher than the density corresponding to the third limit value.

REFERENCES:
patent: 3690765 (1972-09-01), Rickard et al.
patent: 3734611 (1973-05-01), Knapp et al.
patent: 3790275 (1974-02-01), Huboi et al.
patent: 3981579 (1976-09-01), Weinert et al.
patent: 3984184 (1976-10-01), Pflugbeil
patent: 4099064 (1978-07-01), Grossman

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