R
Ravi K. Sharma
Publications - 64
Citations - 2445
Ravi K. Sharma is an academic researcher. The author has contributed to research in topics: Signal & Digital watermarking. The author has an hindex of 26, co-authored 64 publications receiving 2445 citations.
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Patent
Wavelet domain watermarks
TL;DR: A wavelet domain watermark encoder and decoder embed and detect auxiliary signals in a media signal, such as a still image, video or audio signal as mentioned in this paper, using techniques that take advantage of processing plural levels of resolution of the signal.
Patent
Methods for object recognition and related arrangements
Geoffrey B. Rhoads,Yang Bai,Tony F. Rodriguez,Eliot Rogers,Ravi K. Sharma,John D. Lord,Scott M. Long,Brian T. Macintosh,John Stach,Robert G. Lyons,Kurt M. Eaton +10 more
TL;DR: In this paper, the authors describe a range of object registration and registration arrangements that enable users and other entities to register or enroll physical objects into one or more object registries on which an object recognition process can be performed.
Patent
Digital watermark screening and detection strategies
TL;DR: In this paper, a signal is screened to compute detection values evincing presence and strength of the embedded signal, such as rejecting un-marked signals, improving synchronization of a reader used to extract hidden messages in suspect signals, determining authenticity of signals, and controlling use of the signals.
Patent
Automated methods for distinguishing copies from original printed objects
Tony F. Rodriguez,Alastair M. Reed,Ravi K. Sharma,Osama M. Alattar,Brett T. Hannigan,Kenneth L. Levy,Hugh L. Brunk,Geoffrey B. Rhoads,Ammon E. Gustafson +8 more
TL;DR: In this paper, the authors describe methods for using embedded auxiliary signals in documents for copy detection and other applications, where the auxiliary signal is formed as an array of elements selected from a set of print structures with properties that change differently in response to copy operations.
Patent
Authenticating Identification and Security Documents
TL;DR: In this article, an application discloses identification and security documents and methods and system for authenticating such identification and Security documents. But the application is restricted to a single document and it cannot be used to authenticate financial documents.