Method for signaling image information, and method for decoding image information using same
The present invention relates to a method offor 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 offor signaling prediction mode information, serving according to the present invention, as a method offor signaling image information, includes performing 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 picture information, wherein the picture 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;
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; and
performing inter prediction on the partition of the current block based on the merge flag,
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, and
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”.
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 picture information.
4. 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.
5. The method of claim 4 , wherein the current block is the current coding unit.
6. The method of claim 4 , 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.
7. The method of claim 6 , wherein a binary code for the N×N partition type consists of multiple 0 without 1.
8. A picture encoding method, by an encoding apparatus, the method comprising:
generating a skip flag indicating whether a skip mode is applied to the current block;
generating partition mode information for the current block, when a value of the skip flag is set equal to 0;
generating a 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; and
encoding picture information including the skip flag, the partition mode information, and the merge flag,
wherein in the encoded picture information, the partition mode information is configured to be decoded 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, and
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”.
9. The method of claim 8 , 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.
10. The method of claim 8 , 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 included in the picture information.
11. A non-transitory computer-readable storage medium storing encoded picture information generated by performing: generating a skip flag indicating whether a skip mode is applied to the current block; generating partition mode information for the current block, when a value of the skip flag is set equal to 0; generating a 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; and encoding picture information including the skip flag, the partition mode information, and the merge flag, wherein in the encoded picture information, the partition mode information is configured to be decoded 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, and 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”.