A dual watermarking technique for images
MULTIMEDIA '99 Proceedings of the seventh ACM international conference on Multimedia (Part 2)
Proceedings of the 27th annual conference on Computer graphics and interactive techniques
A Stochastic Approach to Content Adaptive Digital Image Watermarking
IH '99 Proceedings of the Third International Workshop on Information Hiding
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
A Contrast-Sensitive Visible Watermarking Scheme
IEEE MultiMedia
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IEEE Transactions on Information Forensics and Security
A Novel Image Recovery Algorithm for Visible Watermarked Images
IEEE Transactions on Information Forensics and Security
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IEEE Transactions on Multimedia
Joint wavelet and spatial transformation for digital watermarking
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IEEE Transactions on Image Processing
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
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Expert Systems with Applications: An International Journal
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IEEE Transactions on Image Processing
Multimedia Tools and Applications
Region based QIM digital watermarking scheme for image database in DCT domain
Computers and Electrical Engineering
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In this study, we propose a complete architecture based on digital watermarking techniques to solve the issue of copyright protection and authentication for digital contents. We apply visible and semi-fragile watermarks as dual watermarks where visible watermarking is used to establish the copyright protection and semi-fragile watermarking authenticates and verifies the integrity of the watermarked image. In order to get the best tradeoff between the embedding energy of watermark and the perceptual translucence for visible watermark, the composite coefficients using global and local characteristics of the host and watermark images in the discrete wavelet transform (DWT) domain is considered with Human Vision System (HVS) models. To achieve the optimum noise reduction of the visibility thresholds for HVS in DWT domain, the contrast-sensitive function (CSF) and noise visible function (NVF) of perceptual model is applied which characterizes the global and local image properties and identifies texture and edge regions to determine the optimal watermark locations and strength at the watermark embedding stage. In addition, the perceptual weights according to the basis function amplitudes of DWT coefficients is fine tuned for the best quality of perceptual translucence in the design of the proposed watermarking algorithm. Furthermore, the semi-fragile watermark can detect and localize malicious attack effectively yet tolerate mild modifications such as JPEG compression and channel additive white Gaussian noise (AWGN). From the experimental results, our proposed technique not only improves the PSNR values and visual quality than other algorithms but also preserves the visibility of the watermark visible under various signal processing and advanced image recovery attacks.