Method and apparatus for entropy-encoding and entropy-decoding video signal
AssigneeLG Electronics Inc.
InventorJaeho Lee
Life of this patent
Estimating the term…
Abstract
The present invention relates to a method for performing entropy decoding on a video signal including a current block. The method comprises the steps of: deriving affine coding information and/or affine prediction mode information of a left block and/or an upper block which are adjacent to the current block; determining a context index of a syntax element associated with an affine prediction of the current block on the basis of at least one of the affine coding information and/or the affine prediction mode information of the left block and/or the upper block; and entropy decoding the syntax element associated with the affine prediction of the current block on the basis of the context index.
Claims10
A method of performing entropy decoding on a video signal including a current block, the method comprising:
- checking whether a left block and top block neighboring the current block are available;
- deriving affine coding information and/or affine prediction mode information of the left block and/or the top block based on at least one of the left block and/or the top block being available;
- determining a context index of an affine prediction-related syntax element of the current block based on at least one of the affine coding information and/or affine prediction mode information of the left block and/or the top block;
- and
- entropy-decoding an affine prediction-related syntax element of the current block based on the context index,
- wherein the affine coding information includes information indicating whether an affine motion prediction has been performed,
- wherein the affine prediction mode information includes information indicating whether the affine motion prediction is performed based on a 4-parameter affine mode or 6-parameter affine mode,
- wherein the 4-parameter affine mode indicates that an affine motion prediction is performed by four parameters,
- wherein the 6-parameter affine mode indicates that an affine motion prediction is performed by six parameters,
- wherein, based on the affine prediction-related syntax element including an affine flag, a context index of the affine flag is determined based on a sum of the affine coding information of the left block and the affine coding information of the top block, and
- wherein the affine flag indicates whether an affine motion prediction has been performed.
An apparatus performing entropy decoding on a video signal including a current block, the apparatus comprising:
- a processor configured to check whether a left block and top block neighboring the current block are available, derive affine coding information and/or affine prediction mode information of the left block and/or the top block based on at least one of the left block and/or the top block is available, determine a context index of an affine prediction-related syntax element of the current block based on at least one of the affine coding information and/or affine prediction mode information of the left block and/or the top block, and
- entropy-decode an affine prediction-related syntax element of the current block based on the context index,
- wherein the affine coding information includes information indicating whether an affine motion prediction has been performed,
- wherein the affine prediction mode information includes information indicating whether the affine motion prediction is performed based on a 4-parameter affine mode or a 6-parameter affine mode,
- wherein the 4-parameter affine mode indicates that an affine motion prediction is performed by four parameters,
- wherein the 6-parameter affine mode indicates that an affine motion prediction is performed by six parameters,
- wherein, based on the affine prediction-related syntax element including an affine flag, a context index of the affine flag is determined based on a sum of the affine coding information of the left block and the affine coding information of the top block, and
- wherein the affine flag indicates whether an affine motion prediction has been performed.
Dependencies are inferred from the claim text.