Image Recovery of Geometric Distortion Using Multi-bitatermarking
Date Issued
2009
Date
2009
Author(s)
Chiu, Yu-Hsiang
Abstract
A novel watermarking scheme which recovers an image from geometric distortionnd carries multi-bit binary message is proposed in this thesis. In our watermarkingcheme, several templates are inserted into the discrete wavelet transform domain anderves as the registration references. We provide a blind watermarking extractionlgorithm to extract the hidden message and locate the templates. The locations ofemplates and binary message are represented probabilistically in the Bayesian network.he displacement parameters of each template can further be obtained once theocations of the templates are estimated. The distorted image is recovered based on theisplacements of each pixel which is estimated by interpolation. Experimentsemonstrate that proposed watermarking scheme are robust to local geometric distortionnd is capable of recovering distorted images well.
Subjects
Local geometric distortion
blind detection
digital watermarking
data hidden
geometric distortion correction
Type
thesis
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