Adaptive spatial-temporal postprocessing for low bit-rate coded

Details Adaptive spatial-temporal postprocessing for low bit-rate coded Adaptive spatial-temporal postprocessing for low bit-rate coded

1994-02-04

1996-04-30

Groody, James J.

Television

Image signal processing circuitry specific to television

Combined noise reduction and transition sharpening

348620, 348627, 348413, 348421, H04N 5213

Patent

active

055129560

ABSTRACT:
A 3D nonlinear postprocessing system and method are utilized to reduce coding artifacts produced by block-based motion-compensated transform coding. In the system and method, a separable 3D filtering structure is used: space-variant FIR-Median Hybrid filtering is used in spatial domain, followed by a motion-compensated nonlinear filtering in the temporal domain. By using this structure and method, the coding artifacts in a reconstructed image sequence can be effectively reduced without blurring edges or moving objects in the image sequence. Significant improvement in the picture quality of low bit-rate coded video sequences is thereby achieved.

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