Patent ID: 7118025

Claim:
A method of enabling a user to instruct a computer system to perform an operation via: an interface surface including an interface, the interface including visible graphical information and substantially invisible coded data; and a sensing device comprising: (a) an image sensor adapted to capture images of at least some of the coded data when the sensing device is placed in an operative position relative to the surface; and (b) a processor adapted to: (i) identify at least some of the coded data from one or more of the captured images; (ii) determine an orientation, within the captured images, of at least some of the coded data; (iii) decode at least some of the coded data; and (iv) generate indicating data indicative of the operation, using at least some of the decoded coded data; the method including the steps of, in the computer system: receiving the indicating data from the sensing device; and performing the operation indicated by the indicating data; wherein the graphical information designated by the user is at least partially indicative, to the user, of the operation.