DCT Difference Modulation(DCTDM) Image Steganography

Abstract

Many different carrier file formats can be used to pursue steganography, but digital images are the most popular because of their frequency over the Internet. In this work a new transform domain image steganography method has been proposed which embeds secret message by modulating adjacent DCT coefficient differences. This approach works for both Gray Scale and RGB images in both uncompressed and lossless compressed domain , yielding a high performance in terms of embedding capacity,imperceptibility and resistivity against some of the well-known steganalysis methods.Experimental results demonstrate the effectiveness and accuracy of the proposed technique in terms of security of hidden data and various image similarity metrics.