Automatic reference background monitoring network for a film...

Details Automatic reference background monitoring network for a film... Automatic reference background monitoring network for a film...

G - Physics

03

D

178/3

G03D 13/00 (2006.01) G03D 3/13 (2006.01)

Patent

CA 1163566

ABSTRACT OF THE DISCLOSURE A film processor having film transport rollers driven by a drive motor, a sensor for generating a signal representative of roller transport speed and a film density detector arrangement that includes a photodetector responsive to the intensity of a light source for generating a reference background level signal against which processed film is compared is characterized by a monitoring arrangement which periodically samples the photodetector output signal and adjusts a reference background level signal in accordance with fluctuations in the output of the scanner arrangement. To prevent the system from reacting to momentary perturbations in background level a moving weighted averaging technique is employed. The rate at which the reference background level signal is sampled is determined by the transport roller speed.

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