New patent applications are published on Thursdays. Both of today's Spotlight Applications concern aspects of digital fingerprinting. Assigned to Optimark, the first application discloses techniques for applying a digital fingerprint to a digital signal. Assigned to Yahoo!, the second application discloses techniques for extracting video fingerprints and identification of multimedia using video fingerprinting.
20150128290, "Digital communications," assigned to Optimark, LLC
A device to apply a digital fingerprint to a digital signal comprises a means of intercepting or acquiring a signal, a storage element and a processor for executing computer implemented programme code components in the storage element to effect the methods. The methods include transforming a plurality of signal samples onto a discrete orthonormal basis and ranking the transformed samples according to their magnitude. The n largest principal components of the ranked transformed samples are optionally permuted to generate a re-ordered set of principal components, which are then altered by a marking angle. The marked principal components and unmarked non-principal components are converted and combined and applying an inverse of the transform function to the combined principal and non-principal components to generate a fingerprinted digital signal. Methods to prepare the signal for marking, recover the digital fingerprint and verify the distributor and/or recipients of the signal are also disclosed.
20150125036, "Extraction of video fingerprints and identification of multimedia using video fingerprinting," assigned to Yahoo!
A video fingerprinting algorithm extracts characteristic features from regions of interest in a media object, such as a video signal. The regions of interest contain the perceptually important parts of the video signal. A fingerprint may be extracted from a target media object, and the fingerprint the target media content may then be matched against multiple regions of interest of known reference fingerprints. This matching may allow identification of complex scenes, inserts, and different versions of the same content presented in, for example, different formats of the media object.