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US 12,713,065 B2Granted
Image data encoding/decoding method and apparatus
AssigneeB1 Institute of Image Technology, Inc.
InventorKi Baek Kim
Life of this patent
Estimating the term…
Abstract
Disclosed are methods and apparatuses for image data encoding/decoding. A method of decoding an image includes receiving a bitstream in which the image is encoded; obtaining index information for specifying a block division type of a current block in the image; and determining the block division type of the current block from a candidate group pre-defined in the decoding apparatus. The candidate group includes a plurality of candidate division types, including at least one of a non-division, a first quad-division, a second quad-division, a binary-division or a triple-division. The method also includes dividing the current block into a plurality of sub-blocks; and decoding each of the sub-blocks with reference to syntax information obtained from the bitstream.
Claims5
A method of decoding an image with a decoding apparatus, comprising:
- receiving a bitstream in which the image is encoded;
- obtaining, from the bitstream, at least one among a single index for specifying a block division type of a current block in the image, a first flag specifying whether to perform horizontal binary-division and a second flag specifying whether to perform vertical binary-division, the first flag being different from the second flag;
- determining, based on at least one among the single index, the first flag and the second flag, the block division type of the current block from a candidate group pre-defined in the decoding apparatus,
- wherein the single index is used to select one candidate division types among a plurality of candidate division types included in the candidate group,
- wherein, when a size of the current block is within a predetermined range, the plurality of candidate division types includes a first quad-division, a second quad-division, and a binary-division,
- wherein, when the size of the current block is out of the predetermined range, the plurality of candidate division types does not include the second quad-division,
- wherein the first quad-division is representative of dividing, based on one horizontal line and one vertical line, one coding block into four coding blocks, the second quad-division is representative of dividing, based on three horizontal lines or three vertical lines, one coding block into four coding blocks, and the binary-division is representative of dividing one coding block into two coding blocks, and
- wherein the binary-division includes the horizontal binary-division and the vertical binary-division,
- dividing, based on the determined block division type, the current block into a plurality of sub-blocks;
- and
- decoding each of the sub-blocks with reference to syntax information obtained from the bitstream,
- wherein the four coding blocks obtained by the second quad-division have the same size each other, and
- wherein the decoding each of the sub-blocks comprises generating a residual block by decoding information obtained from the bitstream.
10 more elements
A method of encoding an image with an encoding apparatus, comprising:
- determining a block division type of a current block in the image from a candidate group pre-defined in the encoding apparatus;
- and
- encoding each of sub-blocks resulting from dividing the current block based on the determined block division type,
- wherein a single index is used to select one candidate division types among a plurality of candidate division types included in the candidate group,
- wherein, when a size of the current block is within a predetermined range, the plurality of candidate division types includes a first quad-division, a second quad-division, and a binary-division,
- wherein, when the size of the current block is out of the predetermined range, the plurality of candidate division types does not include the second quad-division,
- wherein the first quad-division is representative of dividing, based on one horizontal line and one vertical line, one coding block into four coding blocks, the second quad-division is representative of dividing, based on three horizontal lines or three vertical lines, one coding block into four coding blocks, and the binary-division is representative of dividing one coding block into two coding blocks,
- wherein the binary-division includes a horizontal binary-division and a vertical binary-division,
- wherein the four coding blocks obtained by the second quad-division have the same size each other, and
- wherein the encoding each of the sub-blocks comprises encoding a residual block into the bitstream,
- encoding at least one among the single index for specifying the determined block division type of the current block, a first flag specifying whether to perform the horizontal binary-division and a second flag specifying whether to perform the vertical binary-division, the first flag being different from the second flag.
8 more elements
A method of transmitting a bitstream comprising:
- determining a block division type of a current block in the image from a candidate group pre-defined in the encoding apparatus;
- encoding each of sub-blocks resulting from dividing the current block based on the determined block division type to generate the bitstream;
- and
- transmitting the bitstream,
- wherein a single index is used to select one candidate division types among a plurality of candidate division types included in the candidate group,
- wherein, when a size of the current block is within a predetermined range, the plurality of candidate division types includes a first quad-division, a second quad-division, and a binary-division,
- wherein, when the size of the current block is out of the predetermined range, the plurality of candidate division types does not include the second quad-division,
- wherein the first quad-division is representative of dividing, based on one horizontal line and one vertical line, one coding block into four coding blocks, the second quad-division is representative of dividing, based on three horizontal lines or three vertical lines, one coding block into four coding blocks, and the binary-division is representative of dividing one coding block into two coding blocks,
- wherein the binary-division includes a horizontal binary-division and a vertical binary-division,
- wherein the four coding blocks obtained by the second quad-division have the same size each other, and
- wherein the encoding each of the sub-blocks comprises encoding a residual block into the bitstream,
- encoding at least one among the single index for specifying the determined block division type of the current block, a first flag specifying whether to perform the horizontal binary-division and a second flag specifying whether to perform the vertical binary-division, the first flag being different from the second flag.
9 more elements
Dependencies are inferred from the claim text.