01-01-2015 дата публикации
Номер: US20150003518A1
Принадлежит:
Methods of encoding and decoding video in a low-fidelity mode are described. A coding unit level low-fidelity flag is present in the bitstream to signal whether low-fidelity mode is enabled for a particular coding unit or not. If enabled, then, for that coding unit, the chroma quantization parameter is determined using the luma quantization parameter adjusted by a low-fidelity-mode offset. If not enabled, then, for that coding unit, the chroma quantization parameter is determined using the luma quantization parameter without adjustment by the low-fidelity-mode offset. The chroma quantization parameter is then used in the scaling of quantized chroma transform domain coefficients. Use with luma or other video components is also proposed. 1. A method of decoding video from a bitstream of encoded video using a video decoder , the video including a picture partitioned into coding units , the method comprising: reconstructing a low-fidelity flag associated with that coding unit and associated with a video component;', 'if the low-fidelity flag is set, then determining a quantization parameter for the video component based upon a low-fidelity-mode offset;', 'if the low-fidelity flag is not set, then determining the quantization parameter for the video component without using the low-fidelity-mode offset; and', 'dequantizing decoded coefficients in the video component for the coding unit, based upon the quantization parameter, to produce dequantized coefficients., 'for one of the coding units,'}2. The method claimed in claim 1 , wherein the video component includes at least one of a luma component claim 1 , a chroma component claim 1 , an alpha component claim 1 , a red component claim 1 , a green component claim 1 , and a blue component.3. The method claimed in claim 1 , wherein reconstructing the low-fidelity flag comprises decoding the low-fidelity flag from the bitstream.4. The method claimed in claim 3 , wherein decoding the low-fidelity flag comprises decoding the low ...
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