Encryption systems for initiating, encrypting, decrypting, storing and transporting undetectable secure electronic data communications over public and private networks, including the Internet or the like.

A method of providing robust and secure fingerprints including, at an enrollment stage, the steps of providing a content x for which a fingerprint is to be provided, assigning an ID number to the content x, providing a secret key k, generating a fingerprint b.sub.x based on content x and secret key k, storing the generated fingerprint b.sub.x together with the assigned ID in a database, as well as, at an identification stage, the steps of extracting, for a given query content y which might result either from the enrolled content x or an unrelated content x′, an estimate fingerprint b.sub.y based on content y, and secret key k, producing an estimated I{hacek over (D)} number based on the estimate fingerprint b.sub.y for identifying the content x using said ID number stored in the database, or else rejecting the query.

The disclosed systems, structures, and methods are directed to a digital watermarking system comprising: a data separator configured to receive a digital data file and segregate the digital data file into a message component and a data component, in which the message component includes a message, and the data component includes a data file; a message pipeline configured to process the message; a data pipeline configured to process the data file; a watermark pipeline configured to embed the processed message file onto the processed data file; and an inverse process pipeline configured to inverse the process applied by the data pipeline while processing the data file and generate a watermarked data file.

Provided are a template-based watermarking method for a DIBR 3D image and an apparatus thereof. The method includes: determining a template watermark inserting area and a message watermark inserting area in spatial domain of an image; transforming the determined template watermark inserting area into a frequency domain to insert at least one preset template watermark and transforming the determined message watermark inserting area into a frequency domain to insert a preset message watermark; and transforming the template watermark inserting area, into which the template watermark is inserted, into a spatial domain and transforming the message watermark inserting area, into which the message watermark is inserted, into a spatial domain.

Differential modulation schemes encode a data channel within host signal or noisy environment in a manner that is robust, flexible to achieve perceptual quality constraints, and provides improved data capacity. Differential arrangements enable a decoder to suppress host signal or other background signal interference when detecting, synchronizing and extracting an encoded data channel. They also enable the incorporation of implicit or explicit synchronization components, which are either formed from the data signal or are complementary to it.

Systems and methods provide guidance for selection of projection perspectives to utilize to obtain complementary combinations of projection images of an object. The systems and methods provide a first two-dimensional image of the object which has been obtained from a first perspective having a first spatial orientation with reference to a coordinate system. The systems and methods define a first parameter indicative of a degree to which candidate perspectives complement the first perspective, define at least one scale of values between first and second limits, the first and second limits are associated with first and second candidate perspectives having complementary and non-complementary relations to the first perspective. The systems and methods associate the values to the first parameter for the candidate perspectives and display indicia indicative of the values of the first parameter with reference to the coordinate system as guidance for selecting candidate perspectives.

In an embodiment, a method of decoding a watermarked video includes receiving a video including a watermark and three or more pilot signals. The method includes attempting to detect the watermark and retrieve a corresponding message in the video based on one or more decoding starting points of the video. The method includes outputting the message if the attempt is successful. If the attempt fails, the method includes detecting the pilot signals in the video; based on the detected pilot signals, estimating a geometric distortion of the video; inverting the geometric distortion for the video to generate a warped video; and attempting to detect the watermark and retrieve the corresponding message in the warped video based on one or more decoding starting points of the warped video.

Advanced signal processing technology including steganographic embedding and digital watermarking is described. For an encoded image, detectability measures can be generated including a first detectability measure associated with a synchronization component strength and a second detectability measure associated with a message component strength. Such measures can be used to help determine a likelihood that the encoded image, once printed on a physical substrate, will be detectable from optical scan data representing such. Of course, other features and combinations are described as well.

A device comprises an image handling module for protecting an image of a scene captured by a camera. The image handling module is configured detect, in association with the image, a watermark signal having been embedded in light illuminating the scene at a respective geographic location. Further, the image handling module is configured to lookup the detected watermark signal in a privacy database, and based thereon to selectively inhibit use of the image.

Digital Cameras configured to verify authenticity of digital photos taken with the digital camera and related methods and computer program products are provided. GPS information associated with a photograph taken with the digital camera is obtained. A checksum of pixels that make up the photograph and the obtained GPS information is generated. The generated checksum is encrypted using a private key associated with the digital camera so as to allow verification that the photograph has not been modified.