Switching Between Orthogonal Watermarks for Enhanced Security Against Collusion in Video

Switching between orthogonal watermarks for enhanced security against collusion in video
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The method as recited in claim 8 wherein the correlating step comprises the step of correlating the quadrature watermarked signals with the quadrature spatial synchronization patterns to produce quadrature temporal synchronization signals.

A hybrid approach for image security by combining watermarking with Encryption

The method as recited in claim 9 wherein the watermark decoder generating step comprises the steps of: adding the quadrature temporal synchronization signals to produce the temporal synchronization signal;. The method as recited in claim 10 wherein the synchronizing step comprises the steps of: counting a frame clock at the frame rate in a modulo N frame counter; and.

The method as recited in claim 1 wherein the watermark decoder generating step comprises the steps of: calculating a matrix product of a circular shift pseudo-noise sequence matrix and the temporal synchronization signal, the temporal synchronization signal being a matrix having a value for each frame of the block of signal frames; and. The method as recited in claim 1 wherein the synchronizing step comprises the steps of: counting a frame clock at the frame rate in a modulo N frame counter; and.

The method as recited in claim 11 further comprising the steps of: regenerating the PN sequence at the watermark decoder in synchronization with the watermark encoder;. The method as recited in claim 14 further comprising the step of shifting the quadrature spatial synchronization patterns according to the horizontal shift prior to the correlating step. The method as recited in claim 14 wherein the regenerating step comprises the step of accessing a lookup table using the frame count from the modulo N frame counter as an address, the output from the lookup table being the PN sequence in synchronization with the watermark encoder.

The method as recited in claim 14 wherein the determining step comprises the steps of: differencing the quadrature spatial synchronization signals to produce a difference signal; and.

Digital Forensics and Watermarking

The method as recited in claim 17 wherein the shifting step comprises the step of horizontally shifting the quadrature spatial synchronization patterns in response to the horizontal control signal. The method as recited in claim 11 further comprising the steps of: correlating one of the quadrature watermarked signals with a pair of spatial synchronization patterns derived from the corresponding quadrature spatial synchronization pattern, one of the pair being the quadrature spatial synchronization pattern shifted upward by H lines and the other being the quadrature spatial synchronization pattern shifted downward by L lines, to produce a pair of temporal synchronization signals; and determining from the pair of temporal synchronization signals a vertical shift of the watermarked signal.

The method as recited in claim 19 wherein the determining step comprises the steps of: differencing the pair of temporal synchronization signals to produce a difference signal; and. The method as recited in claim 20 further comprising the step of shifting the quadrature spatial synchronization patterns prior to the correlating step according to the vertical shift. The method as recited in claim 21 wherein the shifting step comprises the step of vertically shifting the quadrature spatial synchronization patterns in response to the vertical control signal.

The method as recited in claim 1 further comprising the steps of: obtaining a phase signal for the watermarked signal and a corresponding phase signal for the spatial synchronization pattern;.

The method as recited in claim 23 further comprising the step of applying the x,y position shift to the spatial synchronization pattern prior to the correlating step. The method as recited in claim 23 wherein the obtaining step comprises the steps of: performing a transform from the spatial to the frequency domain for the watermarked signal to produce as an output the phase signal; and.

The method as recited in claim 25 wherein the second performing step comprises the step of reading the corresponding phase signal from a lookup table. The method as recited in claim 23 wherein the determining step comprises the steps of: obtaining the difference between the respective phase signals to produce a phase differential signal; and. The method as recited in claim 1 further comprising the steps of: adding to the watermark pattern in the watermark encoder an additional data pattern modulated by a truncated Walsh code as a Walsh pattern to add additional bits to the block of signal frames as a robust, low data rate channel where the data pattern represents a high data rate channel providing multiple bits per frame; and.

The method as recited in claim 1 wherein the data pattern comprises: a data portion; and. The method as recited in claim 29 wherein the error correction code comprises a Reed-Solomon code. The method as recited in claim 1 wherein the block of signal frames is subdivided into sub-blocks having a duration of S frames comprising the steps of: encoding each sub-block at the watermark encoder with a repeating PN sequence of length S, where S is an integer divisor of N;.

The method as recited in claim I wherein the block of signal frames is subdivided into sub-blocks having a duration of S frames comprising the steps of: encoding each sub-block at the watermark encoder with a repeating PN sequence of length S, where S is an integer divisor of N;. The method as recited in claim 10 further comprising the step of obtaining a watermark pattern signal level from the matrix product.

The method as recited in claim 33 wherein the obtaining step comprises the step determining the watermark pattern signal level as a function of a largest value of the matrix product and a second largest value of the matrix product. The method as recited in claim 34 wherein the determining step comprises the step of solving the following formula for the watermark pattern signal level:. The method as recited in claims 35 or 36 wherein SecondLargest X is replaced with the average of all the remaining values of the matrix product except Largest X.

The method as recited in claim 28 comprising the step of obtaining a watermark pattern signal level from the Walsh pattern. The method as recited in claim 38 wherein the obtaining step comprises the step of solving the following formula:. The method as recited in claim 37 further comprising the step of displaying the watermark pattern signal level with an icon.

The method as recited in claim 37 further comprising the step of displaying the watermark pattern signal level as a bar graph. The method as recited in claim 37 further comprising the step of comparing SigLev with a constant near zero to determine a loss-of-signal condition to indicate that the signal either is not watermarked or the watermark pattern is insufficient for reliable decoding.

The method as recited in claim 1 further comprising the step of forming a second watermark pattern for adding to the signal where the first spatial synchronization pattern is associated with a first set of data patterns and a second spatial synchronization pattern is associated with a second set of data patterns so that the watermark decoder checks for more than one spatial synchronization pattern at the same time. The method as recited in claim 43 further comprising the step at the watermark decoder of: determining where there is more than one synchronization pattern in the watermarked signal a hierarchy between the synchronization patterns; and.

A method of generating a watermark pattern for watermarking a signal comprising the steps of: multiplying quadrature components of a spatial synchronization pattern with a pseudo-noise sequence to produce quadrature spatio-temporal synchronization patterns;. The method as recited in claim 45 further comprising the step of modulating the quadrature watermark patterns with quadrature components of a carrier frequency to produce quadrature modulated watermark patterns; and adding the quadrature modulated watermark patterns to produce the watermark pattern.

USB2 en. EPA1 en. Method and device for embedding watermark information and method and device for extracting embedded watermark information. Method and system for analyzing signal-vector data for pattern recognition from first order sensors. Providing a watermarked decoded audio or video signal derived from a watermarked audio or video signal that was low bit rate encoded and decoded. Methods and apparatus for performing variable block length watermarking of media. Method for achieving volume data robust watermark based on three-dimensional DCT perceptual Hash.

Methods and apparatus to perform audio watermarking and watermark detection and extraction. USB1 en. Apparatus and method for embedding and extracting digital water mark using blind mode based on wavelet.

USA1 - Temporal synchronization of video watermark decoding - Google Patents

EPA3 en. USA1 en. System reactions to the detection of embedded watermarks in a digital host content. Methods and apparatus for enhancing the robustness of watermark extraction from digital host content.

checkout.midtrans.com/conocer-mujeres-solteras-lupin.php Digital watermark anti fake method in anti-digital-to-analog conversion process. Electronic watermark embedding device and electronic watermark detection device. Method and apparatus for rapid synchronization of shift register related symbol sequences. Three-dimensional discrete cosine transform DCT -based geometric attack resistant volume data watermark realization method. Extraction of embedded watermarks from a host content based on extrapolation techniques.

Extraction of embedded watermarks from a host content using a plurality of tentative watermarks. Efficient extraction of embedded watermarks in the presence of host content distortions. WOA1 en.

Concise analysis of current text automation and watermarking approaches

Systems, methods and apparatuses for the secure transmission and restricted use of media content. EPA4 en. Spread spectrum arrangement for de multiplexing speech signals and nonspeech signals. Adaptive scaling for decoding spatially periodic self-clocking glyph shape codes.

Method and apparatus for encoding trellis coded direct sequence spread spectrum communication signals. USA en. Orchestrated encoding and decoding multimedia content having plural digital watermarks. Hernandez et al. DCT-domain watermarking techniques for still images: Detector performance analysis and a new structure. Bender et al. Deguillaume et al. Digital watermarking method robust against local and global geometric distortions and projective transforms. Barni et al.

Rechercher

Watermarking systems engineering: enabling digital assets security and other applications. System and methodology for tracing to a source of unauthorized copying of prerecorded proprietary material, such as movies. Performance analysis of a 2-D-multipulse amplitude modulation scheme for data hiding and watermarking of still images. Digital watermarking for ROI medical images by using compressed signature image. Adsumilli et al.

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A robust error concealment technique using data hiding for image and video transmission over lossy channels. EPA2 en. Noda et al. Application of bit-plane decomposition steganography to JPEG encoded images. Swanson et al. Moreover, the watermark should be embedded into a video with sufficient motion.

In conclusion, the proposed technique enables copyright-owners to identify pirates when they illegally distribute visibly-watermarked videos, even when the watermarked area is removed. Traditional spread spectrum-based audio watermarking methods usually use randomly generated pseudonoise sequences for watermark embedding and extraction. In this paper, we use Hadamard sequences, which are rows of Hadamard matrices, to embed and extract watermarks instead of pseudonoise sequences.

By exploiting the orthogonality of Hadamard sequences and a technique of sign change, we propose a new spread spectrum-based audio watermarking method. Experimental results show that, compared to the newly high embedding capacity spread spectrum-based audio watermarking method, our method achieves a better perceptual quality and a higher embedding capacity while maintaining almost equal strong robustness. We also provide a theoretical analysis of the security of our method.

Digital Forensics and Watermarking

This paper presents a digital rights protection scheme for every type of document presented as an image, by using steps that use cryptography and watermarking. The entities involved in this process are two: the owner of the document that owns its digital rights and a generic user who can download or view a watermarked version of the original document. The watermarked version contains a QR code that is repeatedly inserted, and scrambled, by the document rights owner, into the frequency components of the image, thus producing the watermarked image.

The QR code contains a signed ID that uniquely identifies every users using the system. The schema, a non-blind type, achieves good perceptive quality and fair robustness using the third level of the Discrete Wavelet Transform. The experimental results show that by inserting several occurrences of a scrambled QR code we get an approach that is quite resistant to JPEG compression, rotation, cropping, and salt and pepper noise.

Keywords/Phrases

In this paper, we propose a dynamic database crypto-watermarking scheme that enables a cloud service provider CSP to verify the integrity of encrypted databases outsourced by different users. The incorrect detection of the watermark, not only informs the CSP the database has been illegally modified but also indicates which data have been altered. In addition, the proposed scheme is dynamic in the sense the watermarking and integrity verification processes can be conducted along the database lifecycle, i.