晕影校正方法及使用该方法之影像讯号处理器;LENS SHADING CORRECTION METHOD AND IMAGE SIGNAL PROCESSOR FOR PERFORMING THE SAME

摘要

一种晕影校正方法，用以校正一影像之像素，包括：接收一既有像素之一座标；于该影像上设定一临界范围；提供一第一增益方程式以及一第二增益方程式，各增益方程式分别将该像素之座标对应至亮度增益；对临界范围以内的既有像素执行第一增益方程式以计算其亮度增益；以及对临界范围以外的既有像素执行一混合增益方程式以计算其亮度增益，其中该混合增益方程式为该第一增益方程式与该第二增益方程式之混合。; 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.