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US 11,909,974 B2Granted
Chroma quantization parameter adjustment in video encoding and decoding
AssigneeInterDigital VC Holdings, Inc.
InventorsFabrice Leleannec, Franck Galpin, Tangi Poirier, Edouard Francois
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Abstract
A video coding system uses a value of a chroma quantization parameter table to quantize or de-quantize chroma values of a block of the video, the chroma quantization parameter table being directly coded in a set of parameters at the picture level or at the sequence level of the coded video stream. A corresponding encoding method, encoding device, decoding method, decoding device, and non-transitory readable medium are proposed.
Claims20
A method comprising:
- selecting, for a block of an image, a chroma quantization parameters table from amongst a plurality of pre-determined chroma quantization parameters tables based on an encoding performance level;
- encoding said block based on the selected chroma quantization parameters table, wherein the encoding comprises quantizing chroma values of said block according to said at least one value of the selected chroma quantization parameters table;
- and
- generating a bitstream comprising at least said encoded block and high-level syntax information comprising a flag representative of the encoding performance level.
1 more element
A method comprising:
- accessing metadata for a block of an image or video, said metadata comprising a high-level syntax flag representative of an encoding performance level;
- selecting a chroma quantization parameters table from amongst a plurality of pre-determined chroma quantization parameters tables based on the high-level syntax flag representative of the encoding performance level;
- and
- de-quantizing chroma values of the block using at least one value of the selected chroma quantization parameters table.
1 more element
A device comprising:
- a non-transitory computer readable medium storing a plurality of pre-determined chroma quantization parameters tables;
- and
- one or more processors configured to:
- select, for a block of an image, a chroma quantization parameters table from amongst the plurality of pre-determined chroma quantization parameters tables based on an encoding performance level;
- encode said block based on the selected chroma quantization parameters table, wherein the encoding comprises quantizing chroma values of said block according to said at least one value of the selected chroma quantization parameters table;
- and
- generate a bitstream comprising at least said encoded block and high-level syntax information comprising a flag representative of the encoding performance level.
4 more elements
A device comprising:
- a non-transitory computer readable medium storing a plurality of pre-determined chroma quantization parameters tables;
- and
- one or more processors configured to:
- access metadata for a block of an image or video, said metadata comprising a high-level syntax flag representative of an encoding performance level;
- select a chroma quantization parameters table from amongst the plurality of pre-determined chroma quantization parameters tables based on the high-level syntax flag representative of the encoding performance level;
- de-quantize chroma values of the block using at least one value of the selected chroma quantization parameters table;
- and
- produce a reconstructed image based on the de-quantized chroma values of a plurality of blocks of the image.
5 more elements
Dependencies are inferred from the claim text.