Adaptive filtering based upon boundary strength
First Claim
Patent Images
1. A method of decoding an image to be used as a reference frame, comprising:
- inverse quantizing a block of transformed and quantized coefficients;
inverse transforming the inverse quantized block of coefficients;
reconstructing an image using the inverse transformed block;
deblock filtering the reconstructed image; and
storing the deblock filtered image to be used as a reference frame;
wherein the deblock filtering comprises determining whether or not to conduct filtering a boundary between two adjacent blocks in the reconstructed image, where;
(1) filtering is conducted when at least one of the two adjacent blocks is intra-coded, and(2) filtering is not conducted when both of the two adjacent blocks are not intra-coded, a nonzero transformation coefficient is not coded in both of the two adjacent blocks, the two adjacent blocks are predicted by a same reference frame, and an absolute value of a difference between motion vectors of the two adjacent blocks is smaller than a specified threshold value.
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Abstract
Adjacent regions are identified in an image. Coding parameters for the adjacent regions are identified. Selective filtering is performed at the region between the identified adjacent regions.
32 Citations
1 Claim
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1. A method of decoding an image to be used as a reference frame, comprising:
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inverse quantizing a block of transformed and quantized coefficients; inverse transforming the inverse quantized block of coefficients; reconstructing an image using the inverse transformed block; deblock filtering the reconstructed image; and storing the deblock filtered image to be used as a reference frame; wherein the deblock filtering comprises determining whether or not to conduct filtering a boundary between two adjacent blocks in the reconstructed image, where; (1) filtering is conducted when at least one of the two adjacent blocks is intra-coded, and (2) filtering is not conducted when both of the two adjacent blocks are not intra-coded, a nonzero transformation coefficient is not coded in both of the two adjacent blocks, the two adjacent blocks are predicted by a same reference frame, and an absolute value of a difference between motion vectors of the two adjacent blocks is smaller than a specified threshold value.
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Specification