Television – Image signal processing circuitry specific to television – Combined noise reduction and transition sharpening
Patent
1995-06-06
1998-12-22
Grant, Chris
Television
Image signal processing circuitry specific to television
Combined noise reduction and transition sharpening
348607, 382199, H04N 521
Patent
active
058524754
ABSTRACT:
A post-processor for a decoded video sequence includes a digital noise reduction unit and an artifact reduction unit which significantly reduce blocking artifacts and mosquito noise in a video image. The post-processor uses both temporal and edge characteristics of the video image to enhance the displayed image. The post-processor operates on a current frame of pixel data using information from the immediately preceding post-processed frame that is stored in a frame memory of the post-processor. The post-processor first identifies texture and fine detail areas in the image. The post-processor uses artifact reduction only on portions of the image that are not part of an edge, and are not part of a texture or fine detail area. Since artifact reduction is not utilized on these areas, the post-processed image is not softened in regions where it is easily noticed by the human eye.
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Gupta Smita
Tse Yi Tong
Compression Labs, Inc.
Grant Chris
LandOfFree
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