1979-11-13
1981-08-25
Hix, L. T.
354 31, 354 51, G03B 7093
Patent
active
042855837
ABSTRACT:
A photometric device for determining the exposure interval for a scene to be photographed includes a photometric array having a plurality of individual photocells that are each adapted to receive light reflected from a selected portion of the scene. Each photocell provides a signal output that is proportional to the light from the scene incident upon the cell. The outputs are each time integrated from the initiation of the exposure interval with the integrated results compared to a predetermined value representative of the desired exposure parameters for the film. A logic array terminates the exposure interval when a majority or median number of the time-integrated results indicate that the film exposure parameters for the respective portions of the scene have been met. The exposure interval is advantageously determined as a function of the median value of the light reflected from the scene rather than the average value and the exposure interval is thereby less affected by extreme variations in brightness.
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"The Theory of the Multicell Exposure Meter", Photographic Science and Engineering, vol. 6, No. 3, May-Jun. 1962.
Hix L. T,.
Perkey William B.
Polaroid Corporation
Roman Edward S.
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