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Comparative Analysis of Watermarking Techniques for Improved Compression of Images

S. Sudha

Abstract


Digital Watermarking is a technique which provides embedded copyright information in images. This paper focuses on the capability of visible and invisible watermarking schemes based on DWT and Integer wavelet Transform to hide the original image. There are many techniques available in watermarking the digital image based on spatial and frequency domain. The spatial domain techniques carry less computations and it is not robust against attacks too because in that no transforms are used. In frequency domain techniques, DCT and DWT transforms are used and they provide good robust against attacks such as salt and pepper noise, degradations, histogram modifications, compression and filtering etc., Wavelet based watermarking techniques exploit the frequency  and spatial information of the transformed data in multiple resolutions to improve the compression  rate.  The above cited watermarking techniques are performed by using MATLAB tool which provides better peak signal to noise ratio for digital images.


Keywords


Image, Watermarking, Wavelet Transform, Compression, PSNR.

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References


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