Patent ID: 6641269
Filing Date: 2003-11-04
Classification: G06F,H04N

Abstract:
A method of detecting an indicated position on a display screen that is indicated by a user, comprising the steps of:(a) capturing an image of the display screen that includes the indicated position, the captured image including a plurality of high resolution pixels; (b) producing a low resolution image with lower resolution than the captured image based on the captured image, the low resolution image including a plurality of low resolution pixels, each of the low resolution pixels being associated with respective unit areas within the captured image, the each unit area including a predetermined number of high resolution pixels; (c) finding a low resolution pixel corresponding to the indicated position within the low resolution image; and (d) finding the indicated position within the captured image based on a unit area that is associated with the low resolution pixel corresponding to the indicated position, wherein the number of high resolution pixels in the each unit is selected so that a summation of the number of the high resolution pixels in the each unit and a number of the units in the captured image has a minimum value, the number of the units in the captured image being defined as a function of the number of high resolution pixels in the each unit and the total number of the high resolution pixels in the captured image.