Method and apparatus for controlling loop filtering or post filtering in block based motion compensationed video coding
First Claim
Patent Images
1. A method for encoding an image, comprising:
- identifying spatially adjacent blocks in a same frame of the image;
identifying transform coefficients for the spatially adjacent blocks in the same frame of the image;
comparing the transform coefficients between the spatially adjacent blocks in the same frame of the image;
skipping deblock filtering for removing image residuals caused by encoding the image when the comparison indicates that the spatially adjacent blocks in the same frame of the image have same or similar transform coefficients; and
deblock filtering to remove image residuals between the identified spatially adjacent blocks when the comparison between the transform coefficients for the identified spatially adjacent blocks in the same frame of the image indicate that the spatially adjacent blocks do not have the same or similar transform coefficients.
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Abstract
Adjacent blocks are identified in an image. Coding parameters for the adjacent blocks are identified. Deblock filtering between the identified adjacent blocks is skipped if the coding parameters for the identified adjacent blocks are similar and not skipped if the coding parameters for the identified adjacent blocks are substantially different.
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Citations
19 Claims
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1. A method for encoding an image, comprising:
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identifying spatially adjacent blocks in a same frame of the image; identifying transform coefficients for the spatially adjacent blocks in the same frame of the image; comparing the transform coefficients between the spatially adjacent blocks in the same frame of the image; skipping deblock filtering for removing image residuals caused by encoding the image when the comparison indicates that the spatially adjacent blocks in the same frame of the image have same or similar transform coefficients; and deblock filtering to remove image residuals between the identified spatially adjacent blocks when the comparison between the transform coefficients for the identified spatially adjacent blocks in the same frame of the image indicate that the spatially adjacent blocks do not have the same or similar transform coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An encoder for encoding an image, comprising:
- a processor adapted to;
compare blocks in a same image frame with reference frames; transform a result of the comparison between the reference frames and the blocks in the image frame into transformed blocks having transform coefficients; compare are the similarities between the transform coefficients for spatially adjacent transformed blocks within the same image frame; and skipping deblock filtering between spatially adjacent transformed blocks in the image that have the same or similar transform coefficients. - View Dependent Claims (9, 10, 11)
- a processor adapted to;
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12. A decoder for decoding an encoded image, comprising:
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a processor adapted to identify spatially adjacent blocks in the encoded image; identify coding parameters including D.C. coefficients for the spatially adjacent blocks within a same encoded image frame; compare the identified D.C. coefficients between the identified spatially adjacent blocks; and enable or disable filtering of blocking artifacts between the spatially adjacent blocks according to the comparison of the D.C. coefficients between the spatially adjacent blocks within the same encoded image frame. - View Dependent Claims (13, 14, 15, 16, 17)
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18. An image encoding apparatus, comprising one or more processors configured to:
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store reference images for an image to be encoded, the stored reference images being for motion compensation prediction of the image to be encoded; obtain a reference block from the stored reference images according to a motion vector; encode a difference between the reference block obtained from the stored reference images and a block in the image to be encoded; generate a reconstructed image based on the difference; and judge whether or not to execute deblock filtering for each boundary between adjacent blocks in the reconstructed image with respect to each of a luminance channel and a chrominance channel for the adjacent blocks, wherein the judging includes determining, with respect to one of the luminance channel or the chrominance channel for the adjacent blocks, whether or not motion vectors of the adjacent blocks are equal to each other as well as whether or not the motion vectors of the adjacent blocks point to the same reference image, and in response to determining that the motion vectors of the adjacent blocks are equal to each other and point to the same reference image, deblock filtering is not executed for a boundary of the adjacent blocks in the reconstructed image corresponding to the luminance channel and a boundary of the adjacent blocks in the reconstructed image corresponding to the chrominance channel.
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19. An image encoding method, comprising:
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storing reference images for an image to be encoded, the stored reference images being for motion compensation prediction of the image to be encoded; obtaining a reference block from the stored reference images according to a motion vector; encoding a difference between the reference block obtained from the stored reference images and a block in the image to be encoded; generating a reconstructed image based on the difference; and judging whether or not to execute deblock filtering for each boundary between adjacent blocks in the reconstructed image with respect to each of a luminance channel and a chrominance channel for the adjacent blocks, wherein the judging includes determining, with respect to one of the luminance channel or the chrominance channel for the adjacent blocks, whether or not motion vectors of the adjacent blocks are equal to each other as well as whether or not the motion vectors of the adjacent blocks point to the same reference image, and in response to determining that the motion vectors of the adjacent blocks are equal to each other and point to the same reference image, deblock filtering is not executed for a boundary of the adjacent blocks in the reconstructed image corresponding to the luminance channel and a boundary of the adjacent blocks in the reconstructed image corresponding to the chrominance channel.
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Specification