Research Cell: An International Journal of Engineering Sciences

Navdeep Goel ¹, Gurwinder Singh ¹

Affiliations
1 ECE Section, Yadavindra College of Engineering, Talwandi Sabo, IN

Abstract

The aim of this paper is to examine a set of wavelet functions (wavelets) used in image watermarking system. Several wavelet functions are used to transform the component detail of the image in frequency domain. Discrete wavelet transform (DWT), discrete Fourier transform (DFT) and discrete cosine transform (DCT) are some commonly used transform domain functions out of which discrete wavelet transform is widely used due to its inherent properties. In this paper, discrete wavelet transform is studied and the salient features of discrete wavelet transform are discussed. Discrete wavelet transform has several wavelet functions associated with it. The properties of various wavelet functions of discrete wavelet transform are discussed and the graphical plots of the wavelet functions are plotted using MATLAB, and a comparative analysis is carried out.

Keywords

Digital Image Watermarking, Discrete Wavelet Transform, Haar, Daubechies, Symlet, Coiflet Wavelet.

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Pulkit Aggarwal ¹, Harpreet Kaur ¹, Navdeep Goel ¹

Affiliations
1 ECE Section, Yadavindra College of Engineering, Talwandi Sabo, IN

Abstract

This paper proposes comparison of different types of non-linear filter like median-type noise detector and edge preserving method, new decision based algorithm (DBA), new algorithm with modified shear sorting method and modified decision based un-symmetric trimmed median(MDBUTM) Filters used for restoration of the image containing high density salt and pepper noise as high as 90%. The results of different algorithms are compared to get the best method to achieve better peak signal-to-noise ratio (PSNR), image enhancement factor (IEF) and less computation time. Different algorithms are studied on different window size to find better results in terms of the qualitative and quantitative measures of the image.

Keywords

Impulse Noise, Shear Sort, Decision-Based Filter, Trimmed Filter, Nonlinear Filter.

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