WIDE DYNAMIC RANGE IMAGE PROCESSING METHOD AND IMAGE SIGNAL PROCESSOR USING THE SAME

An image processing method according to an embodiment of the present invention includes the following steps: (a) receiving source data of an NxN sub pixel array which includes multiple first exposed pixels and multiple second exposed pixels which have different exposure times; (b) calculating a difference value between values of normalizing an interpolated value of the first exposed pixels and an interpolated value of the second exposed pixels by channels in the NxN sub pixel array based on the source data, and setting the maximum value of the difference values of each channel as a discrepancy value; (c) setting a correction value of a central pixel of the NxN sub pixel array based on a value of comparing the discrepancy value with a preset threshold value; (d) setting a correction value of each pixel according to the (a), (b), and (c) steps by setting the NxN sub pixel array around each pixel about each of remaining pixels except a central pixel; and (e) updating pixel values of total pixels to correction values and outputting the correction values as correction data.