Controlling a device based upon steganographically encoded data

摘要

A method includes receiving, at a first device, data representing a graphic. The graphic includes non-uniformly toned regions with information steganographically encoded therein. The steganographically encoded information is decoded from the received data. The method also includes communicating with a second device and receiving data from the second device. An aspect of operation of the first device is controlled in accordance with the data received from the second device. The data received from the second device is a function of the decoded information.