Dead zone parameter selections for rate control in video coding
AssigneeQUALCOMM Incorporated
InventorsPeisong Chen, Phanikumar Bhamidipati
Life of this patent
Estimating the term…
Abstract
Quantization techniques are used in video coding to quantize residual coefficients. So-called “dead zone parameters” are selected in the quantization process of residual coefficients of residual video blocks. The dead zone refers to a region of magnitude for coefficients below which any coefficient will be quantized to zero. A method and apparatus of quantizing coefficient values of video blocks in a video coding scheme is provided. A quantization parameter is selected for a set of video blocks. Dead zone parameters are then selected for different video blocks in the set of video blocks. Next, the quantization parameter and the dead zone parameters are applied to quantize the coefficient values of each of the video blocks.
Claims48
A method of quantizing coefficient values of video blocks in a video coding scheme comprising:
- selecting a quantization parameter for a set of video blocks;
- selecting dead zone parameters for different video blocks in the set of video blocks;
- and
- applying the quantization parameter and the dead zone parameters to quantize the coefficient values of each of the video blocks.
An apparatus comprising a quantization unit that quantizes coefficient values of video blocks in a video coding scheme, the quantization unit including:
- a quantization parameter module that selects a quantization parameter for a set of video blocks;
- a dead zone parameter module that selects dead zone parameters for different video blocks in the set of video blocks;
- and
- a quantization module that applies the quantization parameter and the dead zone parameters to quantize the coefficient values of each of the video blocks.
A computer-readable medium comprising instructions that upon execution in a processor cause the processor to:
- select a quantization parameter for a set of video blocks;
- select dead zone parameters for different video blocks in the set of video blocks;
- and
- apply the quantization parameter and the dead zone parameters to quantize coefficient values of each of the video blocks.
A device that quantizes coefficient values of video blocks in a video coding scheme, the device comprising:
- means for selecting a quantization parameter for a set of video blocks;
- means for selecting dead zone parameters for different video blocks in the set of video blocks;
- and
- means for applying the quantization parameter and the dead zone parameters to quantize the coefficient values of each of the video blocks.
Dependencies are inferred from the claim text.