US PATENT SUBCLASS 348 / 590
.~.~.~ Specified details of key signal generation or processing

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}
590.~.~.~ Specified details of key signal generation or processing {3}
591  DF  .~.~.~.~> Self keyers (e.g., key generated from video being mixed {1}
593  DF  .~.~.~.~> Artificial key generation {3}
597  DF  .~.~.~.~> For generation of soft edge (e.g., blending)

DEFINITION

Classification: 348/590

Specified details of key signal generation or processing:

(under subclass 584) Subject matter including a circuitry for producing a signal which controls combining two or more image signals.