Ternary radial harmonic Fourier moments based robust stereo image zero-watermarking algorithm

Color medical image lossless watermarking using chaotic system and accurate quaternion polar harmonic transforms

Robust watermarking using orthogonal Fourier-Mellin moments and chaotic map for double images

Geometrically resilient color image zero-watermarking algorithm based on quaternion Exponent moments

Healthcare institutions adapt cloud based archiving of medical images and patient records to share them efficiently. Controlled access to these records and authentication of images must be enforced to mitigate fraudulent activities and medical errors. This paper presents a zero-watermarking scheme implemented in the composite Contourlet Transform (CT)—Singular Value Decomposition (SVD) domain for unambiguous authentication of medical images. Further, a framework is proposed for accessing patient records based on the watermarking scheme. The patient identification details and a link to patient data encoded into a Quick Response (QR) code serves as the watermark. In the proposed scheme, the medical image is not subjected to degradations due to watermarking. Patient authentication and authorized access to patient data are realized on combining a Secret Share with the Master Share constructed from invariant features of the medical image. The Hu's invariant image moments are exploited in creating the Master Share. The proposed system is evaluated with Checkmark software and is found to be robust to both geometric and non geometric attacks.

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A QR Code Based Zero-Watermarking Scheme for Authentication of Medical Images in Teleradiology Cloud

In the existing method of digital watermark,for embedding watermark information,authors modify more or less original image data through various methods to limit its robustness and security.Zero watermark is a new digital watermarking technology without modifying the data of original image.In this paper,we construct zero watermark using high order cumulants.The result of experiment shows that this zero watermark constructed by this method has good performance.

Sun Tan

Papers

Concept and Application of Zero-Watermark