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US 11,770,534 B2Granted
Method and device for encoding/decoding images
AssigneesElectronics and Telecommunications Research Institute, University-Industry Cooperation Group of Kyung Hee University
InventorsHui Yong Kim, Sung Chang Lim, Jin Ho Lee, Jin Soo Choi, Jin Woong Kim, Gwang Hoon Park, Kyung Yong Kim
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Abstract
A method and a device for encoding/decoding images are disclosed. The method for encoding images comprises the steps of: deriving a scan type of a residual signal for a current block according to whether or not the current block is a transform skip block; and applying the scan type to the residual signal for the current block, wherein the transform skip block is a block to which transform for the current block is not applied and is specified on the basis of information indicating whether or not transform for the current block is to be applied.
Claims3
A video decoding method comprising:
- obtaining first information indicating whether a residual signal is present in a current block, the current block including one or more transform coefficient levels other than 0 when the first information indicates that the residual signal is present in the current block;
- when the first information indicates that the residual signal is present in the current block, obtaining the residual signal of the current block;
- obtaining second information indicating whether an inverse-transform is performed on the residual signal of the current block;
- determining a transform type of the current block when the second information indicates that the inverse-transform is performed on the current block;
- obtaining residual samples of the current block by performing the inverse-transform on the residual signal of the current block based on the determined transform type;
- and
- obtaining prediction samples of the current block based on an intra prediction mode of the current block;
- reconstructing the current block based on the residual samples and the prediction samples;
- and
- applying a filter to the reconstructed samples of the current block,
- wherein the transform type is determined to be a DCT (Discrete Cosine Transform) or a DST (Discrete Sine Transform),
- wherein the transform type is determined independently to the intra prediction mode of the current block, and
- wherein the transform type is determined based on a size of the current block.
10 more elements
A video encoding method comprising:
- obtaining first information indicating whether a residual signal is present in a current block, the current block including one or more transform coefficient levels other than 0 when the first information indicates that the residual signal is present in the current block;
- when the first information indicates that the residual signal is present in the current block, obtaining the residual signal of the current block;
- obtaining second information indicating whether an inverse-transform is performed on the residual signal of the current block;
- determining a transform type of the current block when the second information indicates that the inverse-transform is performed on the current block;
- obtaining residual samples of the current block by performing the inverse-transform on the residual signal of the current block based on the determined transform type;
- and
- obtaining prediction samples of the current block based on an intra prediction mode of the current block;
- reconstructing the current block based on the residual samples and the prediction samples;
- and
- applying a filter to the reconstructed samples of the current block,
- wherein the transform type is determined to be a DCT (Discrete Cosine Transform) or a DST (Discrete Sine Transform),
- wherein the transform type is determined independently to the intra prediction mode of the current block, and
- wherein the transform type is determined based on a size of the current block.
10 more elements
A non-transitory recording medium storing a bitstream formed by a method of encoding a video, the method comprising:
- obtaining first information indicating whether a residual signal is present in a current block, the current block including one or more transform coefficient levels other than 0 when the first information indicates that the residual signal is present in the current block;
- when the first information indicates that the residual signal is present in the current block, obtaining the residual signal of the current block;
- obtaining second information indicating whether an inverse-transform is performed on the residual signal of the current block;
- determining a transform type of the current block when the second information indicates that the inverse-transform is performed on the current block;
- obtaining residual samples of the current block by performing the inverse-transform on the residual signal of the current block based on the determined transform type;
- and
- obtaining prediction samples of the current block based on an intra prediction mode of the current block;
- reconstructing the current block based on the residual samples and the prediction samples;
- and
- applying a filter to the reconstructed samples of the current block,
- wherein the transform type is determined to be a DCT (Discrete Cosine Transform) or a DST (Discrete Sine Transform),
- wherein the transform type is determined independently to the intra prediction mode of the current block, and
- wherein the transform type is determined based on a size of the current block.
10 more elements
Dependencies are inferred from the claim text.