Abstract—In this paper, a comparative study of steganography in the transform domain for the grayscale images is presented. The embedding technique used is based on the modified LSB Varying mode method. The main goal of Steganography includes hiding information or information file into another information file in an undetectable way both perceptually and statistically. To provide an additional layer of security, Cryptography and source encoding methods are used in conjunction with Steganography. In addition to proposing transform based Steganography, we propose to use Self-Synchronizing variable length codes, called T-codes as source encoder to obtain the secret data from the original embedding data. We demonstrate through the experiments that Contourlet performs better than the CDF9/7 and Slantlet transforms in terms of PSNR, SSIM and KLDiv. Comparing Haar Transform with Contourlet it is found that though Haar Wavelet based LSB varying mode method provides better PSNR, SSIM and KLDiv values than Contourlet, the Contourlet lowers detectability and provides more embedding capacity.

Index Terms—DWT, SLT, CTT, PSNR, SSIM, KLDiv.

Department of Mathematics, Rajdhani College, University of Delhi, New Delhi, India.

Cite:Sushil Kumar, "A Comparative Study of Transform Based on Secure Image Steganography," International Journal of Computer and Communication Engineering vol. 4, no. 2, pp. 107-116, 2015.