Method for coding transform coefficient and device therefor
AssigneeLG Electronics Inc.
InventorsJungah Choi, Sunmi Yoo, Seunghwan Kim, Jangwon Choi, Jin Heo
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Abstract
A method by which a decoding device decodes an image, according to the present invention, comprises the steps of: receiving a bitstream including residual information; deriving a quantized transform coefficient for a current block on the basis of the residual information included in the bitstream; deriving a residual sample for the current block on the basis of the quantized transform coefficient; and generating a restored picture on the basis of the residual sample for the current block.
Claims14
An image decoding method performed by a decoding apparatus, the method comprising:
- receiving a bitstream including residual information;
- deriving a quantized transform coefficient for a current block based on the residual information included in the bitstream;
- deriving a residual sample for the current block based on the quantized transform coefficient;
- and
- generating a reconstructed picture based on the residual sample for the current block,
- wherein the residual information includes a context-based coded context syntax element,
- wherein the context syntax element is decoded based on a maximum value of context-coded bins for the current block, and
- wherein the maximum value is determined by a unit of a transform block.
An image encoding method performed by an encoding apparatus, the method comprising:
- deriving a residual sample for a current block;
- deriving a quantized transform coefficient based on the residual sample for the current block;
- and
- encoding residual information including information on the quantized transform coefficient,
- wherein the residual information includes a context-based coded context syntax element,
- wherein the context syntax element is decoded based on a maximum value of context-coded bin for the current block, and
- wherein the maximum value is determined by a unit of a transform block.
-15. (canceled)
Non-transitory computer-readable storage medium storing encoded information causing a decoding apparatus to perform a video encoding method, the method comprising:
- receiving a bitstream including residual information;
- deriving a quantized transform coefficient for a current block based on the residual information included in the bitstream;
- deriving a residual sample for the current block based on the quantized transform coefficient;
- and
- generating a reconstructed picture based on the residual sample for the current block,
- wherein the residual information includes a context-based coded context syntax element,
- wherein the context syntax elements are decoded based on a maximum value of context-coded bins for the current block, and
- wherein the maximum value is determined by a unit of a transform block.
Dependencies are inferred from the claim text.