METHOD AND APPARATUS FOR LENS SHADING CORRECTION

摘要

PURPOSE: A lens shadow distortion compensating method and a device thereof are provided to reduce the capacity of required memory by switching orthogonal coordinates to polar coordinates and applying a section linear model. CONSTITUTION: A lens shadow distortion compensating device receives coordinates of a pixel in a pixel array and calculates a middle value(S100,S120). The device determines a section including the middle value and applies the middle value to a linear approximation(S140,S160). The device reads a correction gain value corresponding to a calculated distance from a correction gain value LUT(LookUp Table) and compensates an input signal outputted from the pixel as the correction gain value(S180,S200). [Reference numerals] (S100) Receive the coordinate(x,y) of a pixel; (S120) Calculate a middle value; (S140) Determine a section(n) containing the middle value(S); (S160) Calculate a distance(r) by applying the middle value(S) to a linear approximation; (S180) Read a correction gain value corresponding to the distance(r) from LUT; (S200) Compensate an input signal outputted form the pixel with the correction gain value; (S220) Output the compensated input signal as an output signal