An ImageSteganography Scheme by Gray Scale Grid Analysis

Abstract

Image steganography differs from cryptography that directly encrypts the data transmitted, embeds important messages into a digital image that appears usual before transmission to improve the concealment of communication. It proposes a novel and secure steganographic method for embedding secret data into a gray scale image. It first partitions the cover image into blocks of the same size and calculates the mean of all pixels in each blocks. And then embed different amount of data bits into different pixels in a block according to the range of the difference value between each pixels and the block mean. In this way, the proposed method different amount of data into blocks of different degree of smoothness. Experimental results show that the quality of both the extracted important image and the stego-image are acceptable. And have the successful way of embedding secret data into an image without noticeable distortion.