Post-filter for removing ringing artifacts of DCT coding

Details Post-filter for removing ringing artifacts of DCT coding Post-filter for removing ringing artifacts of DCT coding

1995-10-20

1998-10-06

Peeso, Thomas

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358465, 382235, 382261, 382268, H04N 1413

Patent

active

058190350

ABSTRACT:
A video signal encoding/decoding system reduces ringing noise by using a post-filter which performs anisotropic diffusion on decoded data. The exemplary system uses an encoding/decoding technique such as that developed by the Moving Picture Experts Group (MPEG). The post-filter processes individual blocks of pixels, assigning an individual edge significance threshold to each block. Noise removal occurs if the edge strength is below the threshold and is inhibited if the edge strength is above the threshold.

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