Tencent has been granted a patent for a method of video decoding in a video decoder. The method involves decoding syntax information from a coded video bitstream, including chroma quantization parameter (QP) offsets in a picture header (PH) level. The chroma QP offsets are used to determine quantization parameters for the coding unit (CU) based on the chroma QP offsets in the PH level and a quantization parameter range offset of the CU. GlobalData’s report on Tencent gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Video decoding method based on chroma quantization parameter offsets
A recently granted patent (Publication Number: US11778185B2) describes a method and apparatus for video encoding. The method involves generating syntax information associated with a coding unit (CU) of a region in a picture. This syntax information includes chroma quantization parameter (QP) offsets in a picture header (PH) level. The chroma QP offsets in the PH level can include Cb, Cr, and CbCr offsets. The quantization parameters for the CU are determined based on joint chroma QP offsets included at multiple levels of the syntax information and a quantization parameter range offset of the CU.
The method further involves obtaining various components of the quantization parameters, such as the Cb and Cr components of the initial quantization parameter of the CU, the Cb and Cr components of the quantization parameter offset in the picture parameter set (PPS) level, and the Cb and Cr components of the coding unit quantization parameter offset. The quantization parameters are then determined by summing the joint chroma QP offsets with the quantization parameter range offset.
The patent also describes a second method where the syntax information is included in a slice header (SH) level instead of the picture header (PH) level. In this case, the quantization parameters are determined based on the joint chroma QP offsets included at multiple syntax levels associated with the CU and the quantization parameter range offset. The second method is triggered by a different offset information value.
The apparatus for video encoding includes processing circuitry that generates the syntax information and determines the quantization parameters based on the joint chroma QP offsets and the quantization parameter range offset.
Overall, this patent presents techniques for video encoding that involve generating syntax information with chroma QP offsets and determining quantization parameters based on joint chroma QP offsets and a quantization parameter range offset. These techniques can improve the efficiency and quality of video encoding processes.
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