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Mathematical Problems in Engineering
Volume 2015 (2015), Article ID 684824, 11 pages
http://dx.doi.org/10.1155/2015/684824
Research Article

An Image Steganography Method Hiding Secret Data into Coefficients of Integer Wavelet Transform Using Pixel Value Differencing Approach

1Government College of Engineering, Aurangabad, Maharashtra 431 005, India
2Jawaharlal Nehru College of Engineering, Aurangabad, Maharashtra 431 005, India

Received 12 November 2014; Accepted 23 December 2014

Academic Editor: Gen Qi Xu

Copyright © 2015 Avinash K. Gulve and Madhuri S. Joshi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The image steganography systems use either the spatial domain or the frequency domain to hide the secret information. The proposed technique uses spatial domain technique to hide secret information in the frequency domain. The cover image is transformed using integer wavelet transform to obtain four subbands: LL, LH, HL, and HH. Then, the PVD approach is used to hide the secret information in the wavelet coefficients of all the four subbands. For improving the security of the hidden information, the proposed method first modifies the difference between two wavelet coefficients of a pair and then uses the modified difference to hide the information. This makes extraction of secret data from the stego image difficult even if the steganography method fails. The result shows that the proposed technique outperforms other PVD based techniques in terms of security of secret information and hiding capacity of cover image.