An Improved Method of Pre-Filter Based Image Watermarking in DWT Domain
An Improved Method of Pre-Filter Based Image Watermarking in DWT Domain

Published in: International Journal on Computer Science and Technology (IJCST), Volume IV, Issue I, January – March, 2013
Paper Name: An Improved Method of Pre-Filter Based Image Watermarking in DWT Domain
Authors: Somnath Maiti, Arindam Bose, Chirag Agarwal, Subir Kumar Sarkar, Nurul Islam
Abstract: In recent years the study of watermarking using CDMA technique in transform domain is a widely popular method. We incorporated modification in existing algorithm with improved imperceptibility of embedded image while making it capable to extract the hidden image by using correlation technique. The original cover image is decomposed in two stages, firstly into appropriate mid-frequency sub-band and secondly into three hierarchical levels of DWT. The logo image is scrambled by PN sequence and then it is embedded in the decomposed cover image. The wavelet coefficients are chosen experimentally for better imperceptibility and robustness against intentional attacks. The result shows a remarkable improvement over the existing methods using similar technique.
Keywords: CDMA, Digital Watermarking, DWT, Sub-band Decomposition.

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