Performance Improvement by Sorting the Transform Coefficients of Host and Watermark using Unitary Orthogonal Transforms Haar, Walsh and DCT
DOI:
https://doi.org/10.14738/aivp.24.400Keywords:
Watermarking, column transform, row transform, cropping, binary distributed run length noise, Gaussian distributed run length noise, resizingAbstract
This paper proposes a new watermarking technique in which host and watermark image is converted to frequency domain using orthogonal transforms Haar/Walsh/DCT. These transforms are applied fully, row wise and column wise to host and watermark. Transform coefficients of host image are sorted in descending order of energy and replaced by sorted transform coefficients of watermark. Column and row transforms of Haar, Walsh and DCT prove better over full transform. Further, sorting results in better imperceptibility as it minimizes the energy difference between original host’s transform coefficients and replaced watermark coefficients. Proposed technique gives better performance than unsorted transform coefficients for watermarking. In this paper results of only Haar transform are given due to space limitation.References
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