Shachi Natu

Work place: MPSTME, NMIMS University, Mumbai, India



Research Interests:


Ms. Shachi Natu has received M.E. (Computer Engineering) degree from Mumbai University in 2010. Currently pursuing Ph.D. from NMIMS University. She has 10 years of experience in teaching. Currently working as Assistant Professor in Department of I.T. at Thadomal Shahani Engineering College, Mumbai. Her areas of interest are Image Processing, Database Management Systems and Operating Systems. She has 27 papers in International Conferences/journal to her credit.

Author Articles
Performance Comparison of Watermarking Using SVD with Orthogonal Transforms and Their Wavelet Transforms

By H. B. Kekre TanujaSarode Shachi Natu

DOI:, Pub. Date: 8 Mar. 2015

A hybrid watermarking technique using Singular value Decomposition with orthogonal transforms like DCT, Haar, Walsh, Real Fourier Transform and Kekre transform is proposed in this paper. Later, SVD is combined with wavelet transforms generated from these orthogonal transforms. Singular values of watermark are embedded in middle frequency band of column/row transform of host image. Before embedding, Singular values are scaled with suitable scaling factor and are sorted. Column/row transform reduces the computational complexity to half and properties of singular value decomposition and transforms add to robustness. Behaviour of proposed method is evaluated against various attacks like compression, cropping, resizing, and noise addition. For majority of attacks wavelet transforms prove to be more robust than corresponding orthogonal transform from which it is generated.

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