Video signal processing method and device
The present invention relates to a video signal processing method and device and is capable of acquiring differential depth index information on the basis of a predetermined binarization method, acquiring a differential depth value by using the differential depth index information, acquiring the depth value of a current depth block by using the differential depth value, and decoding the current depth block by using the depth value of the current depth block. The present invention can increase encoding efficiency.
1. A method for processing video signals by a video decoder, comprising:
acquiring differential depth index information by transforming binary codes into the differential depth index information using a lookup table, wherein the look up table defines each of the differential depth index information corresponding to a respective binary code;
acquiring a differential depth value using the differential depth index information;
acquiring a depth value of a current depth block using the differential depth value; and
decoding the current depth block using the depth value of the current depth block,
wherein a part of binary codes in the lookup table are comprised just a prefix part, and a rest of binary codes in the lookup table are comprised the prefix part and a suffix part,
wherein a number of the binary codes which are comprised just the prefix part is larger than a number of the binary codes which are comprised the prefix part and the suffix part, and
wherein the prefix part is binarized using a unary binarization and the suffix part is binarized using fixed length binarization.
2. The method according to claim 1 , further comprising acquiring a predicted depth value of the current depth block, wherein the depth value of the current depth block is acquired further using the predicted depth value.
3. The method according to claim 1 , further comprising acquiring maximum differential depth index information, wherein the predetermined binarization method uses the maximum differential depth index information.
4. The method according to claim 1 , wherein the lookup table is configured as follows:
Depth index information
Prefix part
Suffix part
1
0
2
10
3
110
4
1110
5
11110
6
111110
7
1111110
8
11111110
9
111111110
10
111111111
00
11
111111111
01
12
111111111
10
wherein the number of the binary codes which are comprised just the prefix part is ¾ of a total number of the depth index information included in the lookup table, and
wherein the number of the binary codes which are comprised the prefix part and the suffix part is ¼ of the total number of the depth index information included in the lookup table.
5. A method for processing video signals by a video decoder, comprising:
acquiring a depth value and a predicted depth value of a current depth block;
acquiring depth index information and predicted depth index information using the depth value and the predicted depth value;
acquiring differential depth index information using the depth index information and the predicted depth information; and
acquiring binary codes by transforming the differential depth index information into the binary codes using a lookup table, wherein the look up table defines each of the differential depth index information corresponding to a respective binary code,
wherein a part of binary codes in the lookup table are comprised just a prefix part, and a rest of binary codes in the lookup table are comprised the prefix part and a suffix part,
wherein a number of the binary codes which are comprised just the prefix part is larger than a number of the binary codes which are comprised the prefix part and a suffix part, and
wherein the prefix part is binarized using a unary binarization and the suffix part is binarized using fixed length binarization.
6. The method according to claim 5 , wherein the lookup table is configured as follows:
Depth index information
Prefix part
Suffix part
1
0
2
10
3
110
4
1110
5
11110
6
111110
7
1111110
8
11111110
9
111111110
10
111111111
00
11
111111111
01
12
111111111
10
wherein the number of the binary codes which are comprised just the prefix part is ¾ of a total number of the depth index information included in the lookup table, and
wherein the number of the binary codes which are comprised the prefix part and the suffix part is ¼ of the total number of the depth index information included in the lookup table.
7. A video decoder, comprising:
an entropy decoding unit for acquiring differential depth index information by transforming binary codes into the differential depth index information using a lookup table, wherein the look up table defines each of the differential depth index information corresponding to a respective binary code; and
an intra-prediction unit for acquiring a depth value of a current depth block using the differential depth value,
wherein the predetermined binarization method refers to a coding method using a combination of unary binarization and fixed length binarization,
wherein a part of binary codes in the lookup table are comprised just a prefix part, and a rest of binary codes in the lookup table are comprised the prefix part and a suffix part,
wherein a number of the binary codes which are comprised just the prefix part is larger than a number of the binary codes which are comprised the prefix part and a suffix part, and
wherein the prefix part is binarized using a unary binarization and the suffix part is binarized using fixed length binarization.
8. The video decoder according to claim 7 , wherein the intra-prediction unit acquires a predicted depth value of the current depth block.
9. The video decoder according to claim 7 , wherein the entropy decoding unit acquires maximum differential depth index information, wherein the predetermined binarization method uses the maximum differential depth index information.
10. The video decoder according to claim 7 , wherein the lookup table is configured as follows:
Depth index information
Prefix part
Suffix part
1
0
2
10
3
110
4
1110
5
11110
6
111110
7
1111110
8
11111110
9
111111110
10
111111111
00
11
111111111
01
12
111111111
10
wherein the number of the binary codes which are comprised just the prefix part is ¾ of a total number of the depth index information included in the lookup table, and
wherein the number of the binary codes which are comprised the prefix part and the suffix part is ¼ of the total number of the depth index information included in the lookup table.