Coding parameter adaptive transform artifact reduction process

Television – Image signal processing circuitry specific to television – Combined noise reduction and transition sharpening

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348607, 382269, H04N 521

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active

059203560

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. A coding parameter from a decoder is used in a coding parameter adaptive filter unit within an artifact unit to further enhance the perceived quality of the displayed image. The coding parameter for a particular macroblock is selected using a characteristic of that macroblock. 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 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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Okada, et al.: "An Adaptive Image Quality Improvement Method for DCT Coding Schemes" Mar. 17 1993, PCS'93 1993 Picture Coding Symposium Proceedings, Swiss Federal Institute of Technology, Lausanne (CH) XP000346472.

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