US PATENT SUBCLASS 250 / 201.7
.~.~.~ Based on contrast

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
201.1  DF  .~ Photocell controls its own optical systems {8}
201.2  DF  .~.~ Automatic focus control {5}
201.7.~.~.~ Based on contrast

DEFINITION

Classification: 250/201.7

Based on contrast:

(under subclass 201.2) Subject matter in which the photo-cell generates signals used to create an image and adjustment of the focus is based on the degree of contrast in all or part of the image, i.e., on the ratio of the darkest and lightest portions of all or part of the image.