Improved EMD Steganography with Great Embedding Rate and High Embedding Efficiency

EMD steganographic method by exploiting modification direction in the host images to send secret messages was proposed by Zhang et al. Comparing with other steganographic algorithms, its highlight is high embedding efficiency. In this paper, we describe a new novel method of steganography based on bese idea of EMD embedding, which builds up the multilevel for the secret messages and decreases the redundancy of the host image's transparency for better embedding rate. In order to obtain better transparency of images and conveniency of algorithm, embedding modification does not happen on LSB of the pixels but frequency coefficients in new improved EMD method. The results of experiments show that the proposed method has better performances on the embedding efficiency and the embedding rate than the EMD steganography.