System and method for lens shading image correction

摘要

A system and method for correcting image data. Embodiments of the present invention provide calibration and image correction to overcome various lens effects including lens shading and lens imperfections. In one embodiment, the correction of image data is performed via utilization of a spline surface (e.g., Bezier surface). The use of spline surfaces facilitates efficient hardware implementation. The image correction may be performed on a per channel and illumination type basis. In another embodiment, the present invention provides a method for determine a spline surface to be used for calibrating an image signal processor to be used in correcting image data.

主权项

1. A method of image signal processing, said method comprising:
receiving, within an electronic system, image data from an optical image sensor and wherein said image data comprises data for one or more color channels; accessing a Bezier patch array, wherein said Bezier patch array comprises control points for each of said one or more color channels, wherein said control points define a surface which is a reciprocal function for correcting a lens shading distortion; and utilizing said Bezier patch array with said image data to produce corrected image data.