Method and apparatus for decoding a video signal
The present invention includes obtaining block type identification information on a partition of the current macroblock when the current macroblock is intra-mixed, specifying a block type of the current macroblock based on the block type identification information, obtaining an intra prediction mode of the current macroblock according to the block type of the partition of the current macroblock, and predicting the current macroblock using the intra prediction mode and a pixel value of a neighboring block.
1. A method of processing a video signal by a decoding apparatus, the method comprising:
obtaining, by the decoding apparatus based on a current block being coded in intra mode, intra mode reference information of the current block from the video signal, the intra mode reference information indicating whether or not intra prediction mode information of the current block is derived from a neighboring block adjacent to the current block;
deriving, by the decoding apparatus based on the intra mode reference information, the intra prediction mode information of the current block by selecting one of intra prediction mode candidates, the intra prediction mode candidates including intra prediction mode information of at least one of a top neighboring block or a left neighboring block adjacent to the current block; and
decoding, by the decoding apparatus, pixel values of the current block using the intra prediction mode information, wherein decoding the pixel values of the current block comprises:
splitting, by the decoding apparatus, the current block into a plurality of partitions by a transform block unit for transform coding, and
predicting, by the decoding apparatus, each partition within the current block by using the intra prediction mode information and reconstructed pixel values adjacent to the each partition,
wherein the intra prediction mode information of the current block is commonly used for predicting each of the plurality of partitions within the current block.
2. The method of claim 1 , wherein the deriving the intra prediction mode information of the current block is performed when the intra mode reference information indicates that the intra prediction mode information of the current block is derived from the neighboring block.
3. The method of claim 1 , further comprising:
when the intra mode reference information indicates that the intra prediction mode information of the current block is not derived from the neighboring block, obtaining, by the decoding apparatus, the intra prediction mode information of the current block from the video signal.
4. The method of claim 1 , further comprising:
obtaining, by the decoding apparatus, block type information of the current block from the video signal,
wherein the block type information specifies whether the current block is coded in intra mode or inter mode.
5. The method of claim 1 , wherein the intra prediction mode information of the current block is one of a vertical prediction mode, a horizontal prediction mode, average prediction mode, or a planar prediction mode.
6. The method of claim 1 , wherein the transform block unit corresponds to one of 16×16 block, 8×8 block, or 4×4 block.
7. The method of claim 1 , further comprising:
obtaining, by the decoding apparatus, skip mode indication information of the current block from the video signal, the skip mode indication information specifying whether or not the current block is coded in skip mode,
wherein the block type information of the current block is obtained when the skip mode indication information specifies that the current block is not coded in skip mode.
8. An apparatus for processing a video signal, comprising:
a decoding apparatus configured to:
obtain, based on a current block being coded in intra mode, intra mode reference information of the current block from the video signal, the intra mode reference information indicating whether or not intra prediction mode information of the current block is derived from a neighboring block adjacent to the current block;
derive, based on the intra mode reference information, the intra prediction mode information of the current block by selecting one of intra prediction mode candidates when the intra mode reference information indicates that the intra prediction mode information of the current block is derived from the neighboring block, the intra prediction mode candidates including intra prediction mode information of at least one of a top neighboring block or a left neighboring block adjacent to the current block;
decode pixel values of the current block using the intra prediction mode information, wherein decoding the pixel values of the current block comprises:
splitting the current block into a plurality of partitions by a transform block unit for transform coding, and
predicting each partition within the current block by using the intra prediction mode information and reconstructed pixel values adjacent to the each partition,
wherein the intra prediction mode information of the current block is commonly used for predicting each of the plurality of partitions within the current block.
9. The apparatus of claim 8 , wherein the deriving the intra prediction mode information of the current block is performed when the intra mode reference information indicates that the intra prediction mode information of the current block is derived from the neighboring block.
10. The apparatus of claim 8 , wherein the decoding apparatus is further configured to:
when the intra mode reference information indicates that the intra prediction mode information of the current block is not derived from the neighboring block, obtain the intra prediction mode information of the current block from the video signal.
11. The apparatus of claim 8 , wherein the decoding apparatus is further configured to:
obtain block type information of the current block from the video signal,
wherein the block type information specifies whether the current block is coded in intra mode or inter mode.
12. The apparatus of claim 8 , wherein the intra prediction mode information of the current block corresponds to one of a vertical prediction mode, a horizontal prediction mode, average prediction mode, or a planar prediction mode.
13. The apparatus of claim 8 , wherein the transform block unit corresponds to one of 16×16 block, 8×8 block, or 4×4 block.
14. The apparatus of claim 8 , wherein the decoding apparatus is further configured to:
obtain skip mode indication information of the current block from the video signal, the skip mode indication information specifying whether or not the current block is coded in skip mode,
wherein the block type information of the current block is obtained when the skip mode indication information specifies that the current block is not coded in skip mode.