Digital image processing
Recovery of Watermarks from Distorted Images
IH '99 Proceedings of the Third International Workshop on Information Hiding
Joint wavelet and spatial transformation for digital watermarking
IEEE Transactions on Consumer Electronics
Secure spread spectrum watermarking for multimedia
IEEE Transactions on Image Processing
Robust template matching for affine resistant image watermarks
IEEE Transactions on Image Processing
Rotation, scale, and translation resilient watermarking for images
IEEE Transactions on Image Processing
Embedding image watermarks in dc components
IEEE Transactions on Circuits and Systems for Video Technology
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In this paper, a robust watermarking algorithm in DWT domain against geometric distortion is proposed. We introduce a distance measure between the distorted and undistorted images/video in order to determine the distortion. We can then inverse the geometric distortion to regain synchronization. An efficient algorithm searching for the synchronization parameters has been developed. Using multi-resolution coarse-fine searching to prune the searching space, the computation of algorithm is reduced drastically. The BCH code and 2-D interleaving are exploited to lower detection error probability. Our watermarking algorithm can successfully resist geometrical distortion, including rotation, scaling, translation, shearing, cropping, jitter attack and linear transformations.