HYBRID WATERMARKING OF COLOR IMAGES USING DCT- WAVELET, DCT AND SVD

This paper presents a technique of digital image watermarking using DCT wavelet transform. Use of Haar wavelet is very common in watermarking. However, here DCT wavelet transform of size 256*256 is generated using existing well known orthogonal transform DCT of dimension 128*128 and 2*2. This DCT Wavelet transform is used in combination with the orthogonal transform DCT and SVD to increase the robustness of watermarking. HL2 sub-band is selected for watermark embedding. Performance of the proposed watermarking scheme is evaluated against various image processing attacks like contrast stretching, image cropping, resizing, histogram equalization and Gaussian noise. DCT wavelet transform performs better than our previously proposed DWT-DCT-SVD based watermarking scheme wherein Haar functions are used as basis functions for wavelet transform.

[1]  H. B. Kekre,et al.  Identification of multi-spectral palmprints using energy compaction by Hybrid wavelet , 2012, 2012 5th IAPR International Conference on Biometrics (ICB).

[2]  Shivaprakash Koliwad,et al.  A robust wavelet-based watermarking scheme for copyright protection of digital images , 2010, 2010 Second International conference on Computing, Communication and Networking Technologies.

[3]  Ben Wang,et al.  An image watermarking algorithm based on DWT DCT and SVD , 2009, 2009 IEEE International Conference on Network Infrastructure and Digital Content.

[4]  N. Krishnan,et al.  A Wavelet Transform Based Digital Image Watermarking and Authentication , 2006, 2006 Annual IEEE India Conference.

[5]  Dr.H. B. Kekre,et al.  Performance Comparison of DCT and Walsh Transforms for Watermarking using DWT-SVD , 2013 .

[6]  M. Raval,et al.  Discrete wavelet transform based multiple watermarking scheme , 2003, TENCON 2003. Conference on Convergent Technologies for Asia-Pacific Region.

[7]  Rawya Rizk,et al.  A robust digital image watermarking technique based on wavelet transform , 2011, 2011 IEEE International Conference on System Engineering and Technology.

[8]  Archana B. Patankar,et al.  Performance Comparison of Simple Orthogonal Transforms and Wavelet Transforms for Image Steganography , 2012 .

[9]  Zhen Li,et al.  A new blind robust image watermarking scheme in SVD-DCT composite domain , 2011, 2011 18th IEEE International Conference on Image Processing.