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US 11,057,627 B2Granted
In-loop filtering method according to adaptive pixel classification standard
AssigneeIndustry-University Cooperation Foundation Hanyang University
InventorsKi Baek Kim, Je Chang Jeong
Life of this patent
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Abstract
The in-loop filtering method performed by a video decoding apparatus includes: classifying reconstructed samples according to an absolute classification standard or relative classification standard; acquiring offset data on the basis of results of classifying the reconstructed samples; adding an offset value to the reconstructed samples by referencing the acquired offset data; and outputting the offset value-added reconstructed samples. Accordingly, errors in the reconstructed image can be corrected.
Claims6
A method of performing in-loop filtering according to a sample classification standard, wherein the method is performed in an image decoding apparatus, the method comprising:
- dividing, based on division information signaled through a bitstream, a picture including a current block into tiles, one of the tiles being divided into tile segments by at least one division boundary line in only one of a vertical direction or a horizontal direction independently of other tiles, and each of the tile segments being composed of an integer number of consecutive complete coding tree unit rows and having a rectangular shape;
- reconstructing the current block, the current block resulting from partitioning a coding block based on at least one of a quad-tree partition or a binary-tree partition;
- classifying a reconstructed sample in the current block based on the sample classification standard, the sample classification standard being an absolute classification standard or a relative classification standard;
- obtaining offset information based on a result of classifying the reconstructed sample;
- adding an offset value to the reconstructed sample based on the obtained offset information;
- and
- outputting the reconstructed sample to which the offset value is added,
- wherein, when a size of the coding block is greater than or equal to a pre-defined threshold size, only the quad-tree partition is performed for the partitioning of the coding block,
- wherein the pre-defined threshold size is 128×128,
- wherein the binary-tree partition is performed based on a binary-tree partition flag indicating whether to perform the binary-tree partition and a binary-tree partition direction flag indicating horizontal partition or vertical partition, and
- wherein the binary-tree partition is performed only when the quad-tree partition is no longer performed.
8 more elements
A method of performing in-loop filtering according to a sample classification standard, wherein the method is performed in an image encoding apparatus, the method comprising:
- dividing a picture including a current block into tiles, one of the tiles being divided into tile segments by at least one division boundary line in only one of a vertical direction or a horizontal direction independently of other tiles, and each of the tile segments being composed of an integer number of consecutive complete coding tree unit rows and having a rectangular shape;
- reconstructing the current block, the current block resulting from partitioning a coding block based on at least one of a quad-tree partition or a binary-tree partition;
- classifying a reconstructed sample in the current block based on the sample classification standard, the sample classification standard being an absolute classification standard or a relative classification standard;
- obtaining offset information based on a result of classifying the reconstructed sample;
- adding an offset value to the reconstructed sample based on the obtained offset information;
- and
- outputting the reconstructed sample to which the offset value is added,
- wherein division information on the dividing of the picture is encoded in a bitstream,
- wherein, when a size of the coding block is greater than or equal to a pre-defined threshold size, only the quad-tree partition is performed for the partitioning of the coding block,
- wherein the pre-defined threshold size is 128×128,
- wherein the binary-tree partition is performed only when the quad-tree partition is no longer performed, and
- wherein, when the binary-tree partition is performed, a binary-tree partition flag indicating whether to perform the binary-tree partition and a binary-tree partition direction flag indicating horizontal partition or vertical partition are encoded in the bitstream.
9 more elements
A non-transitory computer readable medium having stored thereon instructions that when executed by a processor perform a decoding method, including:
- dividing, based on division information signaled through a bitstream, a picture including a current block into tiles, one of the tiles being divided into tile segments by at least one division boundary line in only one of a vertical direction or a horizontal direction independently of other tiles, and each of the tile segments being composed of an integer number of consecutive complete coding tree unit rows and having a rectangular shape;
- reconstructing the current block, the current block resulting from partitioning a coding block based on at least one of a quad-tree partition or a binary-tree partition;
- classifying a reconstructed sample in the current block based on a sample classification standard, the sample classification standard being an absolute classification standard or a relative classification standard,
- obtaining offset information based on a result of classifying the reconstructed sample;
- adding an offset value to the reconstructed sample based on the obtained offset information;
- and
- outputting the reconstructed sample to which the offset value is added,
- wherein, when a size of the coding block is greater than or equal to a pre-defined threshold size, only the quad-tree partition is performed for the partitioning the coding block,
- wherein the pre-defined threshold size is 128×128,
- wherein the binary-tree partition is performed based on a binary-tree partition flag indicating whether to perform the binary-tree partition and a binary-tree partition direction flag indicating horizontal partition or vertical partition, and
- wherein the binary-tree partition is performed only when the quad-tree partition is no longer performed.
8 more elements
Dependencies are inferred from the claim text.