US PATENT SUBCLASS 348 / 615
.~.~ Blackspot or shading correction (e.g., corrects for fixed pattern defects)

Current as of: June, 1999
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348 /   HD   TELEVISION

571  DF  IMAGE SIGNAL PROCESSING CIRCUITRY SPECIFIC TO TELEVISION {34}
607  DF  .~ Noise or undesired signal reduction {6}
615.~.~ Blackspot or shading correction (e.g., corrects for fixed pattern defects)

DEFINITION

Classification: 348/615

Blackspot or shading correction (e.g., corrects for fixed pattern defects):

(under subclass 607) Subject matter including apparatus to compensate for the variations in brightness level over different areas of a given reproduced picture due to unequal characteristics of, or imperfections in, an image signal generator.