Patent ID: 7392392
Filing Date: 2008-06-24
Classification: G06T,H04N

Abstract:
1. A method of forensic digital watermarking comprising: receiving a media content signal; selecting an orientation for a forensic digital watermark to be embedded in the content signal, wherein the forensic digital watermark carries a message that identifies a receiver to robustly associate the content signal with the receiver, the orientation specifies a mapping of elements of the message to a pattern of samples in the media content signal, and the receiver selects the orientation from a set of allowed orientations that each map the elements of the message to a different pattern of samples of the content signal; embedding the forensic digital watermark signal at the selected orientation in the content signal; wherein the embedding applies a different orientation for different instances of embedding the message by selecting a different orientation from the set of allowed orientations, different receivers have different forensic digital watermarks, and allowed sets of orientations are assigned to the different receivers to reduce interference between overlapping forensic digital watermarks embedded in the content signal by different receivers; wherein the orientation is randomly selected from the set of allowed orientations for each instance of embedding the digital watermark such that the orientation of the digital watermark varies for content signals processed in the receiver, the receiver embedding the forensic watermark into the content signals to robustly associate the content signals with the receiver; and wherein the orientation specifies a randomly selected pattern of spatial locations of the content signal.