An analysis of edge based image steganography techniques in spatial domain

Steganography is a branch of information security. Steganography aims at hiding the existence of the actual communication. This aim is achieved by hiding the actual information into other information in such a way that intruder cannot detect it. A variety of carrier file formats can be used to carry out steganography e.g. images, text, videos, audio, radio waves etc. But mainly images are used for this purpose because of their high frequency on internet. Number of image steganography techniques has been introduced having some drawbacks and advantages. These techniques are evaluated on the basis of three parameters imperceptibility, robustness and capacity. In this paper we will review various edge based image steganography techniques. Main idea behind these techniques is that edges can bear more variation than smooth areas without being detected.