US PATENT SUBCLASS 348 / 586
.~.~.~ Foreground/background insertion

Current as of: June, 1999
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348 /   HD   TELEVISION

571  DF  IMAGE SIGNAL PROCESSING CIRCUITRY SPECIFIC TO TELEVISION {34}
578  DF  .~ Special effects {3}
584  DF  .~.~ Combining plural sources {7}
586.~.~.~ Foreground/background insertion {1}
587  DF  .~.~.~.~> Including hue detection (e.g., chroma key)

DEFINITION

Classification: 348/586

Foreground/background insertion:

(under subclass 584) Subject matter including a circuitry for selecting a part of one signal (called the foreground) and placing it in the second or background signal.

(1) Note. The foreground video often is used to generate a key signal which controls selection and insertion.