DTCWT based high capacity steganography using coefficient replacement and adaptive scaling
N. Sathisha, R. Vishnu Priya, K. Suresh Babu, K. Bommanna Raja, K R Venugopal, Lalit Mohan Patnaik · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2013
The steganography is used for secure communication. In this paper we propose Dual Tree Complex Wavelet Transform (DTCWT) based high capacity steganography using coefficient replacement and adaptive scaling. The DTCWT is applied on cover image and Lifting Wavelet Transform2 (LWT2) is applied on payload to convert spatial domain into transform domain. The new concept of replacing HH sub band coefficients of DTCWT of cover image by LL sub band coefficients of payload is introduced to generate intermediate stego object. The adaptive scaling factor is used based on entropy of cover image to scale down intermediate stego object coefficient values to generate final stego object. It is observed that the capacity and security are increased in the proposed algorithm compared to existing algorithms.