Method and apparatus for processing a video signal
The present invention relates to a video signal decoding method for adding an intra prediction mode as a sub-macroblock type to prediction of a macroblock in coding a video signal. Some implementations may include obtaining a macroblock type, when a macroblock includes the intra prediction coded sub-macroblock and the inter prediction coded sub-macroblock based on the macroblock type, obtaining prediction mode flag information indicating whether the sub-macroblock is the intra prediction coded or the inter prediction coded, and obtaining a prediction value of the sub-macroblock. Accordingly, implementations disclosed herein may raise coding efficiency of video signal by adding an intra prediction mode as a sub-macroblock type in predicting a macroblock.
1. A method of decoding a video signal by a decoding apparatus, the method comprising:
receiving, by the decoding apparatus, the video signal including a current block to be partitioned into a plurality of partitions;
parsing, by the decoding apparatus from the video signal, first coded block indication information of the current block, the first coded block indication information specifying whether the current block contains transform coefficient information;
when the first coded block indication information corresponds to a value of 1, parsing, by the decoding apparatus from the video signal, second coded block indication information of a first partition of the plurality of partitions, the second coded block indication information specifying whether the first partition contains transform coefficient information;
when the second coded block indication information corresponds to the value of 1, parsing, by the decoding apparatus from the video signal, transform coefficient information of the first partition;
obtaining, by the decoding apparatus, residual data of the first partition by performing an inverse-transform operation based on the parsed transform coefficient information of the first partition; and
reconstructing, by the decoding apparatus, the first partition using the obtained residual data of the first partition.
2. The method of claim 1 , further comprising:
obtaining, by the decoding apparatus from the video signal, an intra prediction mode of the current block; and
obtaining, by the decoding apparatus, a prediction value of the first partition using the obtained intra prediction mode of the current block and reconstructed sample values adjacent to the first partition,
wherein the first partition is reconstructed using the obtained prediction value and residual data of the first partition.
3. The method of claim 2 , further comprising:
when the first coded block indication information corresponds to the value of 1, parsing, by the decoding apparatus from the video signal, third coded block indication information of a second partition of the plurality of partitions, the third coded block indication information specifying whether the second partition contains transform coefficient information;
when the third coded block indication information corresponds to the value of 1, parsing, by the decoding apparatus from the video signal, transform coefficient information of the second partition;
obtaining, by the decoding apparatus, a prediction value of the second partition using the obtained intra prediction mode of the current block and reconstructed sample values adjacent to the second partition;
obtaining, by the decoding apparatus, residual data of the second partition by performing an inverse-transform operation based on the parsed transform coefficient information of the second partition; and
reconstructing, by the decoding apparatus, the second partition using the obtained prediction value and residual data of the second partition.
4. The method of claim 1 , wherein the current block is partitioned into the plurality of partitions based on a transform block unit for the current block, the transform block unit being a rectangular block on which a transform operation is applied.
5. The method of claim 2 , wherein the obtained intra prediction mode of the current block is applied to each of the plurality of partitions.
6. The method of claim 1 , wherein the current block has a size of 32×32 and each of the plurality of partitions has a size of 16×16.
7. The method of claim 1 , wherein the current block has a size of 16×16 and each of the plurality of partitions has a size of 8×8.
8. The method of claim 1 , wherein the current block has a size of 8×8 and each of the plurality of partitions has a size of 4×4.
9. The method of claim 2 , wherein the intra prediction mode is one of a vertical prediction mode, a horizontal prediction mode, or a planar prediction mode.
10. An apparatus configured to decode a video signal, the apparatus comprising:
an entropy decoding unit configured to:
receive the video signal including a current block to be partitioned into a plurality of partitions,
parse, from the video signal, first coded block indication information of the current block, the first coded block indication information specifying whether the current block contains transform coefficient information,
when the first coded block indication information corresponds to a value of 1, parse, from the video signal, second coded block indication information of a first partition of the plurality of partitions, the second coded block indication information specifying whether the first partition contains transform coefficient information, and
when the second coded block indication information corresponds to the value of 1, parse, from the video signal, transform coefficient information of the first partition; and
an inverse-transform unit configured to:
obtain residual data of the first partition by performing an inverse-transform operation based on the parsed transform coefficient information of the first partition, and
reconstruct the first partition using the obtained residual data of the first partition.
11. The apparatus of claim 10 , wherein the entropy decoding unit is further configured to obtain, from the video signal, an intra prediction mode of the current block,
wherein the apparatus further comprises:
an intra prediction unit configured to obtain a prediction value of the first partition using the obtained intra prediction mode of the current block and reconstructed sample values adjacent to the first partition,
wherein the first partition is reconstructed using the obtained prediction value and residual data of the first partition.
12. The apparatus of claim 11 , wherein the entropy decoding unit is further configured to:
when the first coded block indication information corresponds to the value of 1, parse, from the video signal, third coded block indication information of a second partition of the plurality of partitions, the third coded block indication information specifying whether the second partition contains transform coefficient information, and
when the third coded block indication information corresponds to the value of 1, parse, from the video signal, transform coefficient information of the second partition,
wherein the intra prediction unit is further configured to obtain a prediction value of the second partition using the obtained intra prediction mode of the current block and reconstructed sample values adjacent to the second partition,
wherein the inverse-transform unit is further configured to:
obtain residual data of the second partition by performing an inverse-transform operation based on the parsed transform coefficient information of the second partition, and
reconstruct the second partition using the obtained prediction value and residual data of the second partition.
13. The apparatus of claim 10 , wherein the current block is partitioned into the plurality of partitions based on a transform block unit for the current block, the transform block unit being a rectangular block on which a transform operation is applied.
14. The apparatus of claim 11 , wherein the obtained intra prediction mode of the current block is applied to each of the plurality of partitions.
15. The apparatus of claim 10 , wherein the current block has a size of 32×32 and each of the plurality of partitions has a size of 16×16.
16. The apparatus of claim 10 , wherein the current block has a size of 16×16 and each of the plurality of partitions has a size of 8×8.
17. The apparatus of claim 10 , wherein the current block has a size of 8×8 and each of the plurality of partitions has a size of 4×4.
18. The apparatus of claim 11 , wherein the intra prediction mode is one of a vertical prediction mode, a horizontal prediction mode, or a planar prediction mode.