Encoding method and decoding method, and device using same
AssigneesElectronics and Telecommunications Research Institute, University-Industry Cooperation Group of Kyung Hee University
InventorsHui Yong Kim, Gwang Hoon Park, Kyung Yong Kim, Sung Chang Lim, Jin Ho Lee, Jin Soo Choi, Jin Woong Kim
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Abstract
The present invention relates to an encoding method and decoding method, and a device using the same. The encoding method according to the present invention comprises the steps of: specifying an intra prediction mode for a current block; and scanning a residual signal by intra prediction of the current block, wherein the step of scanning the residual signal can determine a scanning type for a luminance signal and a chroma signal of the current block according to an intra prediction mode for a luminance sample of the current block.
Claims5
A method for decoding a video signal, comprising:
- deriving an intra prediction mode of a current block;
- determining a scan type of the current block to be an up-right diagonal scan, a horizontal scan, or a vertical scan based on the intra prediction mode of the current block;
- obtaining transform coefficients of the current block based on the scan type of the current block;
- determining a transform type of the current block to be DCT (Discrete Cosine Transform) or a DST (Discrete Sine Transform);
- performing an inverse-transform on the transform coefficients based on the transform type of the current block to generate residual samples;
- and
- reconstructing the current block by using the residual samples,
- wherein when a size of the current block corresponds to 4×4 and a color component of the current block is a luma component, the inverse-transform is performed by using DST in horizontal and vertical transform directions, for all intra prediction mode and a planar mode of the current block.
Dependencies are inferred from the claim text.