Patent ID: 7233707

Claim:
An image processing system, comprising: projection section which projects a first calibration image or planar light and a second calibration image or planar light onto a projection target; sensing section which generates first sensing information by sensing the projection target onto which the first calibration image or the planar light is projected, and generating second sensing information by sensing the projection target onto which the second calibration image or the planar light is projected; differential image generation section which generates a first differential image which is a difference between a first sensed image indicated by the first sensing information and a second sensed image indicated by the second sensing information; external light effect removal section which performs, when a pixel area having a brightness index value equal to or greater than a predetermined value exists in the first or second sensing information, processing of replacing the brightness index value of the pixel area in the first differential image with a brightness index value in a vicinity of the pixel area in the first differential image, or processing of setting a special value as the brightness index value of the pixel area in the first differential image so that edge detection processing is not performed; and projection target area detection section which generates projection target area information on a position of a projection target area corresponding to the projection target in a sensing area of the sensing section by performing the edge detection processing based on the first differential image subjected to the processing by the external light effect removal section.