Patent ID: 9477884
Filing Date: 2016-10-25
CPC Classification: G06K,G06T,G09C,H04L,H04W

Claim Text:
1. A method comprising the acts: receiving data corresponding to an image of a subject that was earlier encoded with a digital watermark signal to redundantly encode message data, said image having been captured by a camera of a consumer device; processing the received data to yield output data, by: (a) discerning pose information indicating relative positioning of the subject and the camera; and (b) subtracting elements of the received data from each other to determine intra-image gradient information, said processing being performed by a processor in the consumer device configured to perform such act; sending the pose information, and less than half of the determined intra-image gradient information, to a remote system; and receiving response information, the response information being based on information decoded from the gradient information through use of (a) the sent pose information (b) the sent intra-image gradient information, and (c) key information not known to the consumer device; wherein the method further includes: receiving, from the remote system, data identifying N locations within the image; identifying intra-image gradient information for these N locations, said identified information comprising said sent intra-image gradient information; and sending said identified intra-image gradient information for these N locations to the remote system; wherein the remote system is provided intra-image gradient information for only an incomplete subset of locations in the image.