Post-filtering for decoded video signals

Details Post-filtering for decoded video signals Post-filtering for decoded video signals

1994-10-26

1996-12-31

Envall, Jr., Roy N.

Boots, shoes, and leggings

382268, 348413, G06F 700, G06F 1500, G06K 940, H04N 1102

Patent

active

055900640

ABSTRACT:
Encoded video signals comprise sets of transform coefficients (e.g., DCT coefficients) corresponding to different regions of a video frame. An inverse transform is applied to sets of transform coefficients to generate decoded regions of a decoded video frame. The discontinuities for boundaries between adjacent regions are used to adjust one or more of the transform coefficients. The adjusted sets of transform coefficients are then used to generate filtered regions of a filtered video frame corresponding to the decoded video frame. In a preferred embodiment, the transform coefficients are DCT coefficients and the DC and first two AC DCT coefficients are sequentially adjusted to correct for quantization errors in the encoding process.

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