Method and an 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 for decoding a video signal by a decoding apparatus, the video signal including at least one chrominance block to be partitioned into a plurality of sub-blocks, the method comprising:
obtaining, by the decoding apparatus from the video signal, first information for the chrominance block, the first information specifying whether the chrominance block contains transform coefficient information;
obtaining, by the decoding apparatus from the video signal, second information for each of the plurality of sub-blocks based on the first information having a value of 1, the second information of a first sub-block specifying whether the first sub-block contains transform coefficient information;
obtaining, by the decoding apparatus from the video signal, the transform coefficient information of the first sub-block based on the second information of the first sub-block having the value of 1; and
performing, by the decoding apparatus, an inverse-transform operation based on the obtained transform coefficient information.
2. The method according to claim 1 , wherein the video signal does not contain additional information for the chrominance block based on the first information having a value of 0.
3. The method according to claim 1 , wherein the video signal does not contain additional information for the first sub-block based on the second information of the first sub-block having a value of 0.
4. The method according to claim 1 , further comprising:
obtaining, by the decoding apparatus from the video signal, transform coefficient information of a second sub-block based on the second information of the second sub-block having the value of 1; and
performing, by the decoding apparatus, an inverse-transform operation on the obtained transform coefficient information of the second block.
5. The method according to claim 4 , wherein the video signal does not contain additional information for the second sub-block based on the second information of the second sub-block having a value of 0.
6. The method according to claim 1 , wherein the chrominance block is partitioned into the plurality of sub-blocks based on a transform block unit for performing the inverse-transform operation.
7. The method according to claim 1 , wherein the chrominance block contains a Cb or Cr signal.
8. The method according to claim 1 , wherein the chrominance block has a size of 16×16 and each of the plurality of sub-blocks has a size of 8×8.
9. The method according to claim 1 , wherein the chrominance block has a size of 8×8 and each of the plurality of sub-blocks has a size of 4×4.
10. An apparatus configured to decode a video signal including at least one chrominance block to be partitioned into a plurality of sub-blocks, the apparatus comprising:
an entropy decoding unit configured to:
obtain, from the video signal, first information for the chrominance block, the first information specifying whether the chrominance block contains transform coefficient information,
obtain, from the video signal, second information for each of the plurality of sub-blocks based on the first information having a value of 1, the second information of a first sub-block specifying whether the first sub-block contains transform coefficient information, and
obtain, from the video signal, the transform coefficient information of the first sub-block based on the second information of the first sub-block having the value of 1; and
an inverse-transform unit configured to perform an inverse-transform operation based on the obtained transform coefficient information.
11. The apparatus according to claim 10 , wherein the video signal does not contain additional information for the chrominance block based on the first information having a value of 0.
12. The apparatus according to claim 10 , wherein the video signal does not contain additional information for the first sub-block based on the second information of the first sub-block having a value of 0.
13. The apparatus according to claim 10 , wherein the entropy decoding unit is further configured to obtain, from the video signal, transform coefficient information of a second sub-block based on the second information of the second sub-block having the value of 1, and
wherein the inverse-transform unit is further configured to perform an inverse-transform operation on the obtained transform coefficient information of the second block.
14. The apparatus according to claim 13 , wherein the video signal does not contain additional information for the second sub-block based on the second information of the second sub-block having a value of 0.
15. The apparatus according to claim 10 , wherein the chrominance block is partitioned into the plurality of sub-blocks based on a transform block unit for performing the inverse-transform operation.
16. The apparatus according to claim 10 , wherein the chrominance block contains a Cb or Cr signal.
17. The apparatus according to claim 10 , wherein the chrominance block has a size of 16×16 and each of the plurality of sub-blocks has a size of 8×8.
18. The apparatus according to claim 10 , wherein the chrominance block has a size of 8×8 and each of the plurality of sub-blocks has a size of 4×4.