1. A video decoding apparatus (50), comprising: a decoding unit (58) configured to obtain an absolute value of a differential quantization parameter and a sign value of the differential quantization parameter from a bit stream, and to decode in an order from the absolute value of the differential quantization parameter to the sign value of the differential quantization parameter, wherein the differential quantization parameter is a difference between a quantization parameter of a current coding unit and a predicted quantization parameter of the current coding unit, and the bit stream is obtained by encoding in syntax in a manner of separating the differential quantization parameter into an absolute value and a sign value and setting as a parameter of the bit stream in an order from the absolute value of the differential quantization parameter to the sign value of the differential quantization parameter; and an inverse quantizing unit (60) configured to set the differential quantization parameter according to the absolute value of the differential quantization parameter and the sign value of the differential quantization parameter obtained by decoding with the decoding section and to inversely quantize quantized data obtained by decoding the bit stream by using the quantization parameter of the current coding unit obtained based on the set differential quantization parameter.

2. The video decoding apparatus according to Claim 1, wherein the inverse quantizing unit is configured to inversely quantize quantized data obtained by decoding the bit stream by using the quantization parameter of the current coding unit obtained by adding the set differential quantization parameter and the predicted quantization parameter.

3. The video decoding apparatus according to Claim 1 or 2, wherein the decoding unit performs binary arithmetic decoding on the absolute value of the differential quantization parameter and the sign value of the differential quantization parameter.

4. The video decoding apparatus according to Claim 3, wherein the differential quantization parameter is set for each of the coding units obtained by dividing a largest coding unit.

5. The video decoding apparatus according to Claim 1 or 2, wherein the decoding unit decodes the absolute value of the differential quantization parameter and the positive and negative signs of the differential quantization parameter in a case where the differential quantization parameter is non-zero.

6. The video decoding apparatus according to Claim 5, further comprising: a determination unit which determines whether the differential quantization parameter is non-zero.

7. The video decoding apparatus according to Claim 6, wherein the determination unit determines whether the differential quantization parameter is non-zero by using a value indicating whether the differential quantization parameter is non-zero.

8. A video decoding method, comprising: a decoding step of obtaining an absolute value of a differential quantization parameter and a sign value of the differential quantization parameter from a bit stream, and decoding in an order from the absolute value of the differential quantization parameter to the sign value of the differential quantization parameter, wherein the differential quantization parameter is a difference between a quantization parameter of a current coding unit and a predicted quantization parameter of the current coding unit, and the bit stream is obtained by encoding in syntax in a manner of separating the differential quantization parameter into an absolute value and a sign value and setting as a parameter of the bit stream in an order from the absolute value of the differential quantization parameter to the sign value of the differential quantization parameter; and an inverse quantizing step of setting the differential quantization parameter according to the absolute value of the differential quantization parameter and the sign value of the differential quantization parameter obtained by decoding in the decoding step and inversely quantizing the quantized data obtained by decoding the bit stream by using the quantization parameter of the current coding unit obtained based on the set differential quantization parameter.

9. The video decoding method according to claim 8, wherein the inverse quantizing step includes inversely quantizing quantized data obtained by decoding the bit stream by using the quantization parameter of the current coding unit obtained by adding the set differential quantization parameter and the predicted quantization parameter.

10. The video decoding method according to Claim 8 or 9, wherein, in the decoding step, binary arithmetic decoding is performed on the absolute value of the differential quantization parameter and the sign value of the differential quantization parameter.

11. The video decoding method according to Claim 10, wherein the differential quantization parameter is set for each of the coding units obtained by dividing a maximum coding unit.

12. The video decoding method according to Claim 8 or 9, wherein, in the decoding step, the absolute value of the differential quantization parameter and the positive and negative signs of the differential quantization parameter are decoded in a case where the differential quantization parameter is non-zero.

13. The video decoding method according to Claim 12, further comprising: a determination step of determining whether the differential quantization parameter is non-zero.

14. The video decoding method according to Claim 13, characterized in that, in the determination step, a value indicating whether the differential quantization parameter is nonzero is used to determine whether the differential quantization parameter is non-zero. Dated: 05/02/2020 (RITAM NARAYAN RAWAL) IN/PA No. 2055 OF REMFRY & SAGAR ATTORNEY FOR THE APPLICANT[S] , Description:As enclosed

Claims:We Claim:
1. A video decoding apparatus (50), comprising:
a decoding unit (58) configured to obtain an absolute value of a differential quantization parameter and a sign value of the differential quantization parameter from a bit stream, and to decode in an order from the absolute value of the differential quantization parameter to the sign value of the differential quantization parameter, wherein the differential quantization parameter is a difference between a quantization parameter of a current coding unit and a predicted quantization parameter of the current coding unit, and the bit stream is obtained by encoding in syntax in a manner of separating the differential quantization parameter into an absolute value and a sign value and setting as a parameter of the bit stream in an order from the absolute value of the differential quantization parameter to the sign value of the differential quantization parameter; and
an inverse quantizing unit (60) configured to set the differential quantization parameter according to the absolute value of the differential quantization parameter and the sign value of the differential quantization parameter obtained by decoding with the decoding section and to inversely quantize quantized data obtained by decoding the bit stream by using the quantization parameter of the current coding unit obtained based on the set differential quantization parameter.
2. The video decoding apparatus according to Claim 1, wherein the inverse quantizing unit is configured to inversely quantize quantized data obtained by decoding the bit stream by using the quantization parameter of the current coding unit obtained by adding the set differential quantization parameter and the predicted quantization parameter.
3. The video decoding apparatus according to Claim 1 or 2, wherein the decoding unit performs binary arithmetic decoding on the absolute value of the differential quantization parameter and the sign value of the differential quantization parameter.
4. The video decoding apparatus according to Claim 3, wherein the differential quantization parameter is set for each of the coding units obtained by dividing a largest coding unit.
5. The video decoding apparatus according to Claim 1 or 2, wherein the decoding unit decodes the absolute value of the differential quantization parameter and the positive and negative signs of the differential quantization parameter in a case where the differential quantization parameter is non-zero.
6. The video decoding apparatus according to Claim 5, further comprising: a determination unit which determines whether the differential quantization parameter is non-zero.
7. The video decoding apparatus according to Claim 6, wherein the determination unit determines whether the differential quantization parameter is non-zero by using a value indicating whether the differential quantization parameter is non-zero.
8. A video decoding method, comprising:
a decoding step of obtaining an absolute value of a differential quantization parameter and a sign value of the differential quantization parameter from a bit stream, and decoding in an order from the absolute value of the differential quantization parameter to the sign value of the differential quantization parameter, wherein the differential quantization parameter is a difference between a quantization parameter of a current coding unit and a predicted quantization parameter of the current coding unit, and the bit stream is obtained by encoding in syntax in a manner of separating the differential quantization parameter into an absolute value and a sign value and setting as a parameter of the bit stream in an order from the absolute value of the differential quantization parameter to the sign value of the differential quantization parameter; and
an inverse quantizing step of setting the differential quantization parameter according to the absolute value of the differential quantization parameter and the sign value of the differential quantization parameter obtained by decoding in the decoding step and inversely quantizing the quantized data obtained by decoding the bit stream by using the quantization parameter of the current coding unit obtained based on the set differential quantization parameter.
9. The video decoding method according to claim 8, wherein the inverse quantizing step includes inversely quantizing quantized data obtained by decoding the bit stream by using the quantization parameter of the current coding unit obtained by adding the set differential quantization parameter and the predicted quantization parameter.
10. The video decoding method according to Claim 8 or 9, wherein, in the decoding step, binary arithmetic decoding is performed on the absolute value of the differential quantization parameter and the sign value of the differential quantization parameter.
11. The video decoding method according to Claim 10, wherein the differential quantization parameter is set for each of the coding units obtained by dividing a maximum coding unit.
12. The video decoding method according to Claim 8 or 9, wherein, in the decoding step, the absolute value of the differential quantization parameter and the positive and negative signs of the differential quantization parameter are decoded in a case where the differential quantization parameter is non-zero.
13. The video decoding method according to Claim 12, further comprising:
a determination step of determining whether the differential quantization parameter is non-zero.
14. The video decoding method according to Claim 13, characterized in that, in the determination step, a value indicating whether the differential quantization parameter is nonzero is used to determine whether the differential quantization parameter is non-zero.

Dated: 05/02/2020
(RITAM NARAYAN RAWAL)
IN/PA No. 2055
OF REMFRY & SAGAR
ATTORNEY FOR THE APPLICANT[S]
, Description:As enclosed