A dual watermarking technique for images
MULTIMEDIA '99 Proceedings of the seventh ACM international conference on Multimedia (Part 2)
Watermarking of Electronic Text Documents
Electronic Commerce Research
A Contrast-Sensitive Visible Watermarking Scheme
IEEE MultiMedia
A visible watermarking algorithm based on the content and contrast aware (COCOA) technique
Journal of Visual Communication and Image Representation
A contrast-sensitive reversible visible image watermarking technique
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Information Forensics and Security
Secure reversible visible image watermarking with authentication
Image Communication
Applications of the naturalness preserving transform to image watermarking and data hiding
Digital Signal Processing
Rubik's cube watermark technology for grayscale images
Expert Systems with Applications: An International Journal
Prediction-based watermarking schemes using ahead/post AC prediction
Signal Processing
Generic lossless visible watermarking: a new approach
IEEE Transactions on Image Processing
Adaptive visible watermarking in Hadamard domain for digital images
International Journal of Information and Computer Security
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Digital watermarks are emerging as a tool to provide copyright protection for high quality images and video. Though a lot of work has been done in the area of invisible watermarks, relatively less earlier work exists for visible watermarks. As a consensus on the various issues for invisible watermarks to be legally admissible eludes us, a visible watermark could serve as a deterrence to theft and also to provide instantaneous recognition of the owner or creator of an image. We propose a technique in which the location and strength of the watermark image to be embedded is varied in accordance with the underlying content of the image to be watermarked. We propose a new algorithm that classifies each block of 8 脳 8 of pixels into one of 8 classes depending on the sensitivity of the block to distortion. We analyze the texture, edge and luminance information in the block for this purpose. The embedding process is automated and the bits are embedded in the DCT transform domain. Since the strength of the watermark in a block depends on the class to which the block belongs, the result is a pleasant and unobtrusively watermarked image irrespective of the type of image.