Patent ID: 7266240

Claim:
An image processing system comprising: image projection means for projecting at least two difference colored calibration images at different points of time; sensing means for sensing each of the projected calibration images to output sensed information; ratio information generating means for computing a ratio of image signal values or luminance values for each pixel in a sensing area obtained by sensing the calibration images, based on the sensed information to generate ratio information; edge point detecting means for searching the ratio information to find a first value which represents a ratio of image signal values or luminance values among pixel regions each having a predetermined number of pixels in the sensing area, and for detecting edge points of a sensed projected image, based on part of the pixel regions each having the first value equal to or larger than a first predetermined value; pixel block image information generating means for converting sensed information of an area defined by the detected edge points into pixel block image information representing a ratio of image signal values or luminance values for each pixel block including one or more pixels, based on the sensed information and the detected edge points; and correction means for correcting an image signal based on the pixel block image information, wherein the correction means includes: distortion correction means for correcting an image signal to correct distortion in an image based on the pixel block image information; and color non-uniformity correction means for correcting an image signal to correct color non-uniformity based on the pixel block image information; and wherein the image projection means projects an image based on an image signal with corrected distortion and corrected color non-uniformity.