PROJECTION SYSTEM, IMAGE PROCESSOR, PROGRAM AND INFORMATION STORAGE MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a projection system capable of reducing glare of a presenter while maintaining visibility of a screen by suppressing an occurrence of a mask residue and mask expansion, an image processor, a program and an information storage medium.SOLUTION: A projection system includes a projection part for projecting an image to a screen, an image acquisition part for acquiring a screen image obtained by extracting an area corresponding to the screen from a picked-up image obtained by imaging the projected image, a difference calculation part for calculating a difference between an input image and the screen image, and generating a difference image in which a pixel value of an area having the difference equal to or greater than a prescribed value is made to be a first value and a pixel value of an area having the difference less than the prescribed value is made to be a second value, a mask generation part for performing processing that reduces a mask area in which a pixel value is the first value in the difference image to generate a mask image, and a mask drawing part for outputting an image obtained by drawing the mask image in the input image to the projection part.