Patent ID: 8228293

Claim:
A method of using a remote control comprising an image sensor disposed on a front end portion thereof, the method comprising: setting a reference point and a reference direction based on a calibration; detecting at the image sensor first and second markers produced by a light source; calculating a first middle point based on the detecting of the first and second markers; calculating a second middle point based on the first middle point and an angle between the reference direction and a direction from the first detected marker to the second detected marker; calculating a position pointed to by the remote control based on a difference vector between the reference point and the second middle point; and generating an image signal for an image based at least in part on the pointed-to position, wherein the calibration comprises detecting at the image sensor the first and second markers when the remote control points to a calibration pointing position and the reference point is a middle point calculated based on the detecting of the first and second markers during the calibration.