To provide an image processing system for detecting an image a frame which causes large blinking of light among realistic images with a high dynamic range and for correcting the image and a method of image processing. The image processing system includes a histogram conversion portion for calculating a histogram in accordance with an image of an nth frame, an image of an (n+1)th frame, and image data which are stored in an image data storage portion; a histogram comparator portion for calculating a difference between the histogram of the nth frame and the histogram of the (n+1)th frame to form a histogram curve and for comparing the histogram curve with a threshold curve; an image correction circuit portion for performing correction for narrowing the dynamic range of the image data of the image of the (n+1)th frame, which is read from the image data storage portion; and an output switching switch portion for switching and outputting the image data corrected in the image correction circuit portion and the image data from the image data storage portion, which is not corrected, in accordance with output from the histogram comparator portion.