Image processing apparatus and method
AssigneeSony Corporation
InventorKazushi SATO
Life of this patent
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Abstract
An image processing apparatus and a method for improving the coding efficiency for a quantization parameter are provided. The method includes steps of setting a predicted quantization parameter for a current coding unit by using multiple quantization parameters which are set for multiple surrounding coding units located around the current coding unit which is target of coding processing, and setting a difference quantization parameter indicating a difference value between the quantization parameter which is set for the current coding unit and the predicted quantization parameter.
Claims14
An image processing apparatus for encoding image data, the image processing apparatus comprising:
- a predicted quantization parameter setting unit for, with a variable-sized coding unit as a processing unit, according to a position of a current coding unit within a current maximum coding unit, when it is determined that all adjacent coding units adjacent to the current coding unit are located outside the current maximum coding unit and are not in available state, setting, as a predicted quantization parameter, a quantization parameter which is set for a surrounding coding unit located around but not adjacent to the current coding unit, wherein the variable-sized coding unit is obtained by recursively dividing a fixed-sized maximum coding unit according to a quad tree structure in a sequencing unit;
- a difference quantization parameter setting unit for setting a difference quantization parameter indicating a difference value between the current quantization parameter which is set for the current coding unit and the predicted quantization parameter which is set by the predicted quantization parameter setting unit;
- and
- an encoding unit for generating a bit stream comprising the difference quantization parameter set by the difference quantization parameter setting unit, by encoding the image data with the coding unit as the processing unit.
An image processing method for an image processing apparatus for encoding image data, the image processing method comprising:
- enabling a predicted quantization parameter setting unit, with a variable-sized coding unit as a processing unit, according to a position of a current coding unit within a current maximum coding unit, when it is determined that all adjacent coding units adjacent to the current coding unit are located outside the current maximum coding unit and are not in available state, to set, as a predicted quantization parameter, a quantization parameter which is set for a surrounding coding unit located around but not adjacent to the current coding unit, wherein the variable-sized coding unit is obtained by recursively dividing a fixed-sized maximum coding unit according to a quad tree structure in a sequencing unit;
- enable a difference quantization parameter setting unit to set a difference quantization parameter indicating a difference value between the current quantization parameter which is set for the current coding unit and the predicted quantization parameter which is set by the predicted quantization parameter setting unit;
- and
- enable an encoding unit to generate a bit stream comprising the difference quantization parameter set by the difference quantization parameter setting unit, by encoding the image data with the coding unit as the processing unit.
Dependencies are inferred from the claim text.