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Steganography using Coefficient Replacement and Adaptive Scaling based on DTCWT
N Sathisha, K Suresh Babu, K. B. Raja, K R Venugopal
Pages - 41 - 60     |    Revised - 01-03-2015     |    Published - 31-03-2015
Volume - 9   Issue - 2    |    Publication Date - March / April 2015  Table of Contents
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KEYWORDS
Steganography, DTCWT, LWT, Stego Image, Cover Image, Adaptive Scaling, Entropy.
ABSTRACT
Steganography is an authenticated technique for maintaining secrecy of embedded data. Steganography provides hardness of detecting the hidden data and has a potential capacity to hide the existence of confidential data. In this paper, we propose a novel steganography using coefficient replacement and adaptive scaling based on Dual Tree Complex Wavelet Transform (DTCWT) technique. The DTCWT and LWT 2 is applied on cover image and payload respectively to convert spatial domain into transform domain. The HH sub band coefficients of cover image are replaced by the LL sub band coefficients of payload to generate intermediate stego object and the adaptive scaling factor is used to scale down intermediate stego object coefficient values to generate final stego object. The adaptive scaling factor is determined based on entropy of cover image. The security and the capacity of the proposed method are high compared to the existing algorithms.
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Mr. N Sathisha
Government S K S J Technological Institute, Bangalore, India. - India
nsathisha@gmail.com
Dr. K Suresh Babu
Department of Electronics and Communication Engg. UVCE, BANGALORE UNIVERSITY, BANGALORE - India
Dr. K. B. Raja
Department of ECE, University Visvesvaraya College of Engineering, Bangalore, India - India
Dr. K R Venugopal
University Visvesvaraya College of Engineering, Bangalore, India - India