US Patent No. 9,363,509

METHOD FOR DETERMINING COLOR DIFFERENCE COMPONENT QUANTIZATION PARAMETER AND DEVICE USING THE METHOD


Patent No. 9,363,509
Issue Date June 07, 2016
Title Method For Determining Color Difference Component Quantization Parameter And Device Using The Method
Inventorship Sung Chang Lim, Daejeon (KR)
Hui Yong Kim, Daejeon-si (KR)
Se Yoon Jeong, Daejeon-si (KR)
Jong Ho Kim, Daejeon-si (KR)
Ha Hyun Lee, Seoul (KR)
Jin Ho Lee, Daejeon-si (KR)
Jin Soo Choi, Daejeon-si (KR)
Jin Woong Kim, Daejeon-si (KR)
Assignee ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, Daejeon (KR)

Claim of US Patent No. 9,363,509

1. A video decoding apparatus comprising:
an inverse-quantizer configured to determine a size of a quantization group, the quantization group being a group of a plurality
of transform blocks to which a same chrominance component quantization parameter is applied, configured to calculate the chrominance
component quantization parameter applied to the determined quantization group, and configured to inverse-quantize transform
coefficients of a transform block included in the determined quantization group by using the calculated chrominance component
quantization parameter; and

an inverse-transformer configured to generate a residual block by inverse-transforming the inverse-quantized transform coefficients,
wherein the inverse-quantizer comprises:
a chrominance component quantization parameter index calculator configured to calculate a chrominance component quantization
parameter index by using both a first chrominance component quantization parameter offset of a picture level and a second
chrominance component quantization parameter offset of a slice level, the first chrominance component quantization parameter
offset being extracted from a picture parameter set of a bitstream, and the second chrominance component quantization parameter
offset being extracted from a slice header of the bitstream; and

a chrominance component quantization parameter calculator configured to calculate the chrominance component quantization parameter
based on the chrominance component quantization parameter index.