The PTO issues new patents on Tuesdays. Both of today's Spotlight Patents concern aspects of digital watermarking. Assigned to Disney, the first of today's patents addresses techniques for preventing audio watermark detection. Assigned to Digimarc, the second patent addresses content sharing methods and systems that use watermarking.
8,522,032, "System and method to prevent audio watermark detection," assigned to Disney Enterprises, Inc.
A system to prevent audio watermark detection includes content having a video portion and an audio portion, the audio portion having a watermark, an audio/video separator configured to separate the video portion and the audio portion, and a random number generator configured to generate a random number corresponding to a shifted frequency. The system also includes a frequency shift element configured to apply the shifted frequency to the audio portion to alter a spectrum of the watermark so as to prevent detection of the watermark by a device seeking to recover the watermark. The system also includes an audio resampler configured to resample the audio portion to restore the audio portion to an original length, and an audio/video combiner configured to combine the video portion and the audio portion.
8,521,217, "Content sharing methods and systems," assigned to Digimarc.
A first device (such as a cell phone) is equipped with a micro-projector, and used to present imagery on a display surface. A second device (such as a second cell phone) is equipped with a digital camera, and used to capture some of the projected imagery. The captured imagery allows a user of the second device to access digital content of interest from a user of the first device, or from elsewhere. The content may be visual, or of other form (content examples include audio, games, maps, text documents, video, spreadsheets, etc.). In one particular arrangement, the projected imagery is encoded with digital watermark data. Through such arrangements, one user can readily share content, and also engage in collaborative activities--such as cooperative game play, with one or more other users.