Method for signaling image information, and method for decoding image information using same
The present invention relates to a method of for signaling information on a prediction mode and to a method of for decoding image information using same. A According to the present invention, the method of for signaling prediction mode information, serving according to the present invention, as a method of for signaling image information, includes performing prediction on a current block and signaling the prediction-type information applied to the current block. The signaling of the information includes joint-coding and components of signaling information components constituting the prediction-type information. According to the present invention, overhead may be reduced when information on a prediction is signaled.
1. A picture decoding method, by a decoding apparatus, the method comprising:
receiving prediction information, wherein the prediction information includes a skip flag, a merge flag, and partition mode information;
decoding the skip flag indicating whether a skip mode is applied to the current block;
decoding the partition mode information for the current block, when a value of the skip flag is set equal to 0; and
decoding the merge flag indicating whether a merge mode is applied to a partition of the current block, when the value of the skip flag is set equal to 0,
wherein decoding of the partition mode information is performed between decoding of the skip flag and decoding of the merge flag, and
wherein the partition mode information indicates one of partition types including 2N×2N partition type, 2N×N partition type, and N×2N partition type.
2. The method of claim 1 , wherein when the merge mode is applied to the partition, a motion vector of a neighboring block to the partition is used as a motion vector of the partition.
3. The method of claim 1 , wherein when a value of the merge flag is set equal to 0, a motion vector of the partition is derived based on (i) a motion vector of a neighboring block to the partition, and (ii) an additional motion vector value,
wherein the derived motion vector is obtained by adding the motion vector of the neighboring block and the additional motion vector value, wherein the additional motion vector value is obtained from the prediction information.
4. The method of claim 1 , wherein the prediction information includes prediction mode information indicating whether inter prediction or intra prediction is applied to the current block,
wherein decoding of the prediction mode information is performed between decoding of the skip flag and decoding of the merge flag.
5. The method of claim 1 , wherein a binary code for the 2N×2N partition type is “1”, a binary code for the 2N×N partition type is “01”, and a binary code for the N×2N partition type is “001”.
6. The method of claim 1 , further comprising:
receiving a split flag with respect to a coding unit; and
deriving a current coding unit based on the split flag before the checking the skip flag.
7. The method of claim 6 , wherein the current block is the current coding unit.
8. The method of claim 6 , wherein N×N partition type is available only when a size of the current coding unit is same as a size of a minimum coding unit.
9. The method of claim 8 , wherein a binary code for the N×N partition type consists of multiple 0 without 1.
10. A decoding apparatus for decoding a picture, the apparatus comprising:
a decoder configured to receive prediction information, wherein the prediction information includes a skip flag, a merge flag and partition mode information, to decode the skip flag indicating whether a skip mode is applied to the current block, to decode the partition mode information for the current block when a value of the skip flag is set equal to 0, and to decode the merge flag indicating whether a merge mode is applied to a partition of the current block when the value of the skip flag is set equal to 0,
wherein decoding of the partition mode information is performed between decoding of the skip flag and decoding of the merge flag,
wherein the partition mode information indicates one of partition types including 2N×2N partition type, 2N×N partition type, and N×2N partition type.
11. The apparatus of claim 10 , wherein when the merge mode is applied to the partition, a motion vector of a neighboring block to the partition is used as a motion vector of the partition.
12. The apparatus of claim 10 , wherein when a value of the merge flag is set equal to 0, a motion vector of the partition is derived based on (i) a motion vector of a neighboring block to the partition, and (ii) an additional motion vector value,
wherein the derived motion vector is obtained by adding the motion vector of the neighboring block and the additional motion vector value, wherein the additional motion vector value is obtained from the prediction information.
13. The apparatus of claim 10 , wherein the prediction information includes prediction mode information indicating whether inter prediction or intra prediction is applied to the current block,
wherein decoding of the prediction mode information is performed between decoding of the skip flag and decoding of the merge flag.
14. The apparatus of claim 10 , wherein a binary code for the 2N×2N partition type is “1”, a binary code for the 2N×N partition type is “01”, and a binary code for the N×2N partition type is “001”.
15. The apparatus of claim 10 , further comprising:
receiving a split flag with respect to a coding unit; and
deriving a current coding unit based on the split flag before the checking the skip flag.
16. The apparatus of claim 15 , wherein the current block is the current coding unit.
17. The apparatus of claim 15 , wherein N×N partition type is available only when a size of the current coding unit is same as a size of a minimum coding unit.
18. The apparatus of claim 17 , wherein a binary code for the N×N partition type consists of multiple 0 without 1.