Tuesdays new patents are issued by the PTO. This week's Spotlight Patents concern aspects of digital fingerprinting and digital watermarking. Assigned to Google, the first patent addresses techniques for three-dimensional wavelet based video fingerprinting. Assigned to DirecTV, the second patent addresses techniques for remotely inserting watermark into encrypted compressed video bitstream.
8,611,689, "Three-dimensional wavelet based video fingerprinting," assigned to Google.
A method and system generates and compares fingerprints for videos in a video library. The video fingerprints provide a compact representation of the spatial and sequential characteristics of the video that can be used to quickly and efficiently identify video content. Because the fingerprints are based on spatial and sequential characteristics rather than exact bit sequences, visual content of videos can be effectively compared even when there are small differences between the videos in compression factors, source resolutions, start and stop times, frame rates, and so on. Comparison of video fingerprints can be used, for example, to search for and remove copyright protected videos from a video library. Further, duplicate videos can be detected and discarded in order to preserve storage space.
8,611,531, "Method and apparatus for remotely inserting watermark into encrypted compressed video bitstream," assigned to The DirecTV Group, Inc.
A method and apparatus for remote watermarking of a media program is disclosed. The method inserts a pattern of substituted second versions of media program portions that are invisible to the viewer, into reproduced copies of the media program. The method permits the watermarking of encrypted media programs.