Table-driven algorithms for generating space-filling curves
Computer-Aided Design
Watermarking algorithm based on a human visual model
Signal Processing
Content based watermarking of images
MULTIMEDIA '98 Proceedings of the sixth ACM international conference on Multimedia
Adaptive Watermarking in the DCT Domain
ICASSP '97 Proceedings of the 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP '97) -Volume 4 - Volume 4
Invertible Authentication Watermark for JPEG Images
ITCC '01 Proceedings of the International Conference on Information Technology: Coding and Computing
Image-adaptive watermarking using visual models
IEEE Journal on Selected Areas in Communications
On the metric properties of discrete space-filling curves
IEEE Transactions on Image Processing
An image-adaptive semi-fragile watermarking for image authentication and tamper detection
ICCSA'07 Proceedings of the 2007 international conference on Computational science and its applications - Volume Part III
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In this paper, a content based image public watermarking technique which operates in DCT domain is proposed. First, the 8×8 DCT sub-blocks of the host image are rearranged into a Hilbert sequence in Hilbert scanning order, then two neighboring sub-blocks in the Hilbert sequence is pseudo-randomly selected by using chaotic sequences. Then a watermark with visually recognizable pattern is embedded into the original image by changing the polarity of the corresponding middle-frequency coefficients in the two chosen neighboring sub-blocks, and the watermark is adapted to the image by exploiting the masking characteristics of the human visual system (HVS), thus ensuring the watermark invisibility, and the watermark don't need the original image. The experimental results show that the proposed algorithm in this paper is robust to common signal processing techniques and some geometric distortions, such as cropping, scaling and rotation. Especially, it achieves high robustness under signal enhancement operations, such as sharpening, contrast enhancement, edge enhancement and histogram equalization.