US PATENT SUBCLASS 348 / 353
.~.~.~.~ By detecting contrast

Current as of: June, 1999
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348 /   HD   TELEVISION

207  DF  CAMERA, SYSTEM AND DETAIL {19}
335  DF  .~ Optics {12}
345  DF  .~.~ Focus control {5}
349  DF  .~.~.~ Using image signal {5}
353.~.~.~.~ By detecting contrast

DEFINITION

Classification: 348/353

By detecting contrast:

(under subclass 349) Subject matter including a device for detecting brightness differences of video signal components for determining the focus condition.