DEVICE, SYSTEM AND METHOD FOR PROCESSING IMAGE AND STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide an image processor capable of more accurately extracting an irradiation area by taking the pixel value of an irradiation area end into consideration. SOLUTION: A primary difference value calculation means 113d calculates a primary difference value from a one-dimensional column pixel value within an image and a secondary difference value calculation means 113e calculates a secondary difference value from the primary difference value. A judgment means 113f performs judgment as one end point of the irradiation area when the pixel value of a coordinate for which the secondary difference value indicates a minimum value in an area where the primary difference value is positive or negative is equal to or more than a threshold decided by a maximum pixel value within the image.