Patent ID: 7119788

Claim:
An image processing apparatus comprising: capturing means for capturing a first image partially including a second image projected by a projector, wherein said second image is an image of a screen area; extraction means for extracting the second image from the first image on the basis of image information captured by said capturing means; position determination means for determining a position of a bright point disposed on the second image, wherein said position is in a screen system; and blinking-pattern detection means for detecting a logical product of the blinking pattern of the bright point, wherein the logical product is of a first pixel value in a current field and at least one of the following: (i) a second pixel value in one of an immediately preceding field; or (ii) a third pixel value in an immediately subsequent field is obtained, and wherein the bright point is determined to exist only when said first pixel value and either said second pixel value or said third pixel value are on.