Patent Document ID: 20010055060
Application ID: 09810619
Patent Status: 0

Claim One:
1. 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 low resolution pixel being associated with a unit area within the captured image, the 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 a resolution of the low resolution image is determined by finding integers A and B so that a value f given by Equation (1) is at a minimum: 12 f = X × Y A × B + A × B ( 1 ) where X denotes a number of high resolution pixels of the captured image in a horizontal direction, Y denotes a number of high resolution pixels of the captured image in a vertical direction, and A denotes a number of high resolution pixels of the unit area in the horizontal direction, A being a divisor of X, and B denotes a number of high resolution pixels of the unit area in the vertical direction, B being a divisor of Y.