US PATENT SUBCLASS 348 / 356
.~.~.~.~.~ Detection of peak or slope of image signal

Current as of: June, 1999
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207  DF  CAMERA, SYSTEM AND DETAIL {19}
335  DF  .~ Optics {12}
345  DF  .~.~ Focus control {5}
349  DF  .~.~.~ Using image signal {5}
354  DF  .~.~.~.~ By analyzing high frequency component {2}
356.~.~.~.~.~ Detection of peak or slope of image signal

DEFINITION

Classification: 348/356

Detection of peak or slope of image signal:

(under subclass 354) Subject matter including a device to detect upper amplitudes or rate of change of the high frequency component for determining the focus condition.