Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-02-01
1994-10-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
353 26A, G01N 2186
Patent
active
053549945
ABSTRACT:
A method and apparatus for determining the edge of an individual frame of photographic film on a strip of photographic film being moved along a photographic film transport path. A plurality of light sensors are positioned in a substantially linear array substantially perpendicular to and on one side of the path and a light is shined through the film toward the array of light sensors as the strip passes along the path. By sensing the level of illumination incident upon each of the sensors and comparing the level of illumination incident thereon with a predetermined level corresponding to a known degree of opacity associated with the interframe border between individual frames on the film, the presence of a film edge can be determined when the level of illumination associated with a predetermined number of tile sensors corresponds to a degree of opacity at least as great as the predetermined level. Also disclosed is a methodology for measuring the size and optical center of an image in an individual frame of photographic film by measuring the rate of change of sensed density of the film at a plurality of transversely spaced locations as the film is moved incrementally therepast.
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Nelms David C.
Shami K.
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