A Study of High Embedding Rate Steganography Algorithm for Color Images using Complex Wavelet Transforms

The basic requisites for any steganography algorithm include imperceptibility, embedding capacity and robustness to communication attacks. To measure the quality of gray-scale or color image, the metric such as PSNR is widely used by researchers in steganography. However, for digital color image, there are many other options such as WPSNR, PSNRE, PSNRY, PSNR-HSR, CQM etc. In this paper, we have presented a comparative study of transforms such DD DWT and DD DT DWT based high rate steganography algorithm using the Fusion method. The analysis of algorithm is done using different imperceptibility metrics, such as PSNRY, and CQM rather than PSNR, structural similarity metric, SSIM, provable security metric, KLDiv and histogram Through experimental results, it is observed that DD DT DWT outperforms than the other transform in terms of imperceptibility, structural similarity and provable security. Keywords— DWT; CWT;DD DWT; DD DT DWT; PSNR; PSNRY; CQM; SSIM; KLDiv