Adaptive watermark mechanism for rightful ownership protection
Journal of Systems and Software
A Chaos Based Robust Spatial Domain Watermarking Algorithm
ISNN '07 Proceedings of the 4th international symposium on Neural Networks: Part II--Advances in Neural Networks
A Recoverable Semi-fragile Watermarking Scheme Using Cosine Transform and Adaptive Median Filter
ATC '08 Proceedings of the 5th international conference on Autonomic and Trusted Computing
Improving the robustness of DCT-based image watermarking against JPEG compression
Computer Standards & Interfaces
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In this paper, we shall propose an approach toprotect the copyright of image data. There have beenmany watermarking techniques proposed to guard thecopyright of image data, most of which need to embed thewatermark in the cover image. Unfortunately, theembedding always results in the reduction of imagequality. To achieve the goal of copyright protectionwithout reducing the image quality, we incorporate theconcept of digital signature into our approach. At thebeginning, we produce a signature in correspondence withthe cover image and the watermark. We send thissignature to a certification authority or a trusted third party.If someone pirates our image someday, we can stillretrieve the watermark image with the signature that wasstored at the certification authority and prove that theimage is ours. Notice that the watermark image that weuse in this work is a gray-level image.