Image coding method for coding information indicating coding scheme
AssigneePanasonic Intellectual Property Corporation of America
InventorsHISAO SASAI, KENGO TERADA
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Abstract
An image coding method includes a first flag coding step (S501) of coding a first flag that indicates whether a predetermined extension standard of a predetermined image coding standard is used, a second flag coding step (S503) of coding, when the first flag indicates that the extension standard is used (Yes in S502), a second flag that indicates whether a first scheme is used that is a coding scheme included in the extension standard for coding a difference between adjacent-to-each-other samples included in a residual signal of an current block, and an image coding step (S505) of coding, when the second flag indicates that the first scheme is used (Yes in S504), the image by using the first scheme.
Claims12
An image coding method for coding an image on a block-by-block basis, the method comprising:
- a first flag coding step of coding a first flag that indicates whether a predetermined extension standard of a predetermined image coding standard is used;
- a second flag coding step of coding, when the first flag indicates that the extension standard is used, a second flag that indicates whether a first scheme is used for coding a current block to be coded included in the image, the first scheme being a coding scheme included in the extension standard;
- a prediction step of performing prediction on the current block to generate a residual signal, the residual signal indicating a difference between the current block and the predicted current block;
- and
- a coding step of coding, when the second flag indicates that the first scheme is used, the current block by coding a difference between adjacent-to-each-other samples of the current block using the first scheme, the samples being obtained from the residual signal.
An image decoding method for decoding a bitstream obtained through coding of an image on a block-by-block basis, the method comprising:
- a first flag decoding step of decoding, from the bitstream, a first flag that indicates whether a predetermined extension standard of an image coding standard is used;
- a second flag decoding step of decoding, from the bitstream, when the first flag indicates that the extension standard is used, a second flag that indicates whether a first scheme is used for decoding a current block to be decoded included in the image, the first scheme being a coding scheme included in the extension standard;
- a decoding step of (i) decoding a residual signal of the current block that indicates a difference between the current block and a predicted current block and (ii) decoding, from the bitstream, when the second flag indicates that the first scheme is used, the current block by decoding, from the bitstream, a difference between adjacent-to-each-other samples of the current block using the first scheme.
Dependencies are inferred from the claim text.