Patent ID: 6766066
Filing Date: 2004-07-20
Classification: G06F

Abstract:
A pointing position detection apparatus that detects a pointing position, which is pointed with a pointing device having a light emitter, in a display image, the pointing position detection apparatus comprising:a photographic image capture section that captures a photographic image by shooting the display image including a pointing image generated by light emitted from the light emitter of the pointing device; and a detection processing section that detects the pointing position in the display image according to a luminance property of the captured photographic image, the detection processing section comprising: a threshold value determination section that determines a threshold value, which is used to binarize the photographic image, according to the luminance property of the photographic image; a binarization processing section that binarizes the photographic image using the determined threshold value, so as to generate a binary image; and a gravity center position computation section that computes a position of a center of gravity in one pixel area having relatively high luminance values, out of two types of pixel areas constituting the binary image, so as to detect the pointing position.