Motion-estimation-based registration of geometrically distorted images for watermark recovery

Patrick Loo; Nick G. Kingsbury

doi:10.1117/12.435445

1 August 2001 Motion-estimation-based registration of geometrically distorted images for watermark recovery

Patrick Loo, Nick G. Kingsbury

Proceedings Volume 4314, Security and Watermarking of Multimedia Contents III; (2001) https://doi.org/10.1117/12.435445
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

Image registration is essential in spread spectrum based watermark detection of a distorted image. Traditional registration approaches include the use of templates and feature matching between the distorted image and a reference image. However, neither of these techniques adequately addresses localized transformation. We propose a new registration scheme based on motion estimation between the distorted image and a reference copy. Complex wavelets provide a hierarchical framework for our motion estimation algorithm and radial basis functions provide the means to correct erroneous motion vectors. Experimental results show that our approach can estimate the distortion quite accurately and allow correct watermark detection.

Citation Download Citation

Patrick Loo and Nick G. Kingsbury "Motion-estimation-based registration of geometrically distorted images for watermark recovery", Proc. SPIE 4314, Security and Watermarking of Multimedia Contents III, (1 August 2001); https://doi.org/10.1117/12.435445

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