Patent ID: 7517089
Filing Date: 2009-04-14
Classification: H04N

Abstract:
1. An image processing system comprising: image projection means for projecting a first calibration image and a second calibration image at different timings; sensing means for sensing the projected first and second calibration images and generating first and second sensing information; and projection area detection means for generating projection area information relating to a position of a projection area in a sensing area of the sensing means, based on the first and second sensing information, wherein a difference image between the first calibration image and the second calibration image is configured of a center block area positioned around the center of the difference image, a peripheral block area positioned on a periphery of the center block area, and a background area which is an area other than the center block area and the peripheral block area, wherein each pixel in the center block area and the peripheral block area has a different index value from each pixel in the background area, and wherein the projection area detection means comprises: difference image generation means for generating the difference image, based on the first and second sensing information; center reference position detection means for detecting a plurality of center reference positions of the center block area in the sensing area, based on the difference image; peripheral reference position detection means for detecting a plurality of peripheral reference positions of the peripheral block area in the sensing area, based on the center reference positions; and projection area information generation means for generating the projection area information, based on the center reference positions and the peripheral reference positions.