Patent ID: 6531999
Filing Date: 2003-03-11
Classification: G06F

Abstract:
A method of performing a calibration of a pointing direction for a user in a camera-based system, the method comprising the steps of:directing the user to point separately at each point in a set of two or more points at different positions in the system; detecting for each of the points pointed to by the user a location of a pointing finger of the user in an image generated by each of one or more cameras of the system, such that for each of the points the location of the pointing finger and the corresponding point specify a line; computing pointing direction calibration information for the user based at least in part on the lines associated with the two or more points; and determining a line of symmetry of the user in two or more images generated by cameras of the system, and verifying the calibration information by determining if a relationship between the calibration information and the line of symmetry of the user meets a specified criterion.