Lens shading correction method and image signal processor for performing the same
AssigneeHimax Imaging Limited
InventorsPo-Chang Chen, Yuan-Chih Peng, Kuan-Hua Chen
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Abstract
A lens shading correction method for pixels of an image is provided. The method includes the steps of: inputting coordinates of the pixels and setting a threshold range on the image; providing a first gain function and a second gain function, each relating the coordinates of the pixels to brightness gains; performing the first gain function on the pixels located at the interior of the threshold range for calculating the brightness gains; and performing a blended gain function on the pixels located at the exterior of the threshold range for calculating the brightness gains, wherein the blended gain function is the combination of the first gain function and the second gain function.
Claims15
A lens shading correction method for pixels of an image, comprising the steps of:
- receiving a coordinate of a current pixel;
- setting a threshold range on the image;
- providing a first gain function and a second gain function, each relating the coordinates of the pixels to brightness gains;
- performing a first gain function on the current pixel located at the interior of the threshold range for calculating the brightness gain;
- and
- performing a blended gain function on the current pixel located at the exterior of the threshold range for calculating the brightness gains, wherein the blended gain function is the combination of the first gain function and the second gain function.
An image signal processor for performing lens shading correction on pixels of an image, comprising:
- a setting unit, for inputting coordinates of the pixels and setting a threshold range on the image;
- a gain function generating unit, for generating a first gain function and a second gain function, each relating the coordinates of the pixels to brightness gains;
- a calculation unit, coupled to the gain function generating unit and the setting unit, for performing the first gain function on the pixels located at the interior of the threshold range for calculating the brightness gains, and performing a blended gain function on the pixels located at the exterior of the threshold range for calculating the brightness gains, wherein the blended gain function is the combination of the first gain function and the second gain function.
Dependencies are inferred from the claim text.