Method and apparatus for encoding and decoding using selective information sharing between channels between channels
Disclosed herein are a video decoding method and apparatus and a video encoding method and apparatus. Coding decision information of a representative channel of a target block is shared as coding decision information of a target channel of the target block, and decoding of the target block is performed using the coding decision information of the target channel. Since the coding decision information of the representative channel is shared with an additional channel, repeated signaling of identical coding decision information may be prevented. By means of this prevention, the efficiency of encoding and decoding of the target block or the like may be improved.
1. A decoding method, comprising:
performing a determination as to whether to perform decoding on three blocks using coding determination information shared for the three blocks; and
performing the decoding on the three blocks using the coding determination information based on the determination,
wherein the three blocks comprise a luma block and two chroma blocks, and
the coding determination information is applied to the three blocks as a single tree structure is used for the luma block and the two chroma blocks.
2. An encoding method, comprising:
generating information for three blocks by performing encoding for the three blocks;
wherein the three blocks are encoded using coding determination information shared for the three blocks,
the three blocks comprise a luma block and two chroma blocks, and
the coding determination information is applied to the three blocks as a single tree structure is used for the luma block and the two chroma blocks.
3. A non-transitory computer-readable medium storing a bitstream generated by the encoding method of claim 2 .
4. A non-transitory computer-readable medium storing a bitstream, the bitstream comprising:
information for three blocks;
wherein decoding for the three blocks is performed using the information for the three blocks,
a determination as to whether to perform the decoding on the three blocks using a coding determination information shared for the three blocks is performed,
the decoding on the three blocks using the coding determination information is performed based on the determination,
the three blocks comprise a luma block and two chroma blocks, and
the coding determination information is applied to the three blocks as a single tree structure is used for the luma block and the two chroma blocks.
5. The decoding method of claim 1 , wherein the coding determination information is applied to the three blocks as the luma block and the two chroma blocks use an identical partitioning structure.
6. The decoding method of claim 1 , wherein the coding determination information is applied to the luma block and the two chroma blocks having corresponding positions in a case that the luma block and the two chroma blocks have different partition structures, respectively.
7. The decoding method of claim 6 , wherein, when a position of the upper-leftmost pixel, a horizontal width and a vertical width of each chroma block of the two chroma blocks are (xCb, yCb), cbWidth and cbHeight, respectively, the luma block corresponding to the two chroma blocks is a block that occupies a position (xCb+cbWidth/2, yCb+cbHeight/2) within an area of a luma channel.
8. The decoding method of claim 1 , wherein the coding determination information is applied to the luma block and the two chroma blocks having corresponding positions as a dual tree structure is used for the luma block and the two chroma blocks.
9. The decoding method of claim 1 , wherein the coding determination information is information indicating whether a position dependent intra prediction is performed for the three blocks or not.
10. The encoding method of claim 2 , wherein the coding determination information is applied to the luma block and the two chroma blocks having corresponding positions in a case that the luma block and the two chroma blocks have different partition structures, respectively.
11. The encoding method of claim 10 , wherein:
when a position of the upper-leftmost pixel, a horizontal width and a vertical width of each chroma block of the two chroma blocks are (xCb, yCb), cbWidth and cbHeight, respectively, the luma block corresponding to the two chroma blocks is a block that occupies a position (xCb+cbWidth/2, yCb+cbHeight/2) within an area of a luma channel.
12. The encoding method of claim 2 , wherein the coding determination information is applied to the luma block and the two chroma blocks having corresponding positions as a dual tree structure is used for the luma block and the two chroma blocks.
13. The encoding method of claim 2 , wherein the coding determination information is information indicating whether a position dependent intra prediction is performed for the three blocks or not.
14. The non-transitory computer-readable medium of claim 4 , wherein the coding determination information is applied to the luma block and the two chroma blocks having corresponding positions in a case that the luma block and the two chroma blocks have different partition structures, respectively.
15. The non-transitory computer-readable medium of claim 14 , wherein:
when a position of the upper-leftmost pixel, a horizontal width and a vertical width of each chroma block of the two chroma blocks are (xCb, yCb), cbWidth and cbHeight, respectively, the luma block corresponding to the two chroma blocks is a block that occupies a position (xCb+cbWidth/2, yCb+cbHeight/2) within an area of a luma channel.
16. The non-transitory computer-readable medium of claim 4 , wherein the coding determination information is applied to the luma block and the two chroma blocks having corresponding positions as a dual tree structure is used for the luma block and the two chroma blocks.
17. The non-transitory computer-readable medium of claim 4 , wherein the coding determination information is information indicating whether a position dependent intra prediction is performed for the three blocks or not.