International Journal of Computer Applications |
Foundation of Computer Science (FCS), NY, USA |
Volume 68 - Number 1 |
Year of Publication: 2013 |
Authors: Gulve Avinash K, Joshi M. S. |
10.5120/11543-6805 |
Gulve Avinash K, Joshi M. S. . A Image Steganography Method with Five Pixel Pair Differencing and Modulus Function. International Journal of Computer Applications. 68, 1 ( April 2013), 20-26. DOI=10.5120/11543-6805
In this paper, a new image steganography algorithm is proposed which provides better stego-image quality. For hiding the secret data, PVD approach is used. The hiding capacity depends on the difference in pixel values. If the pixels in the pair belong to smooth area, difference is less and if the pixels belong to an edge, difference is very large. If the difference value is large, more data can be hidden. But hiding more data can cause distortion in the stego-image. The algorithm uses modulus function to revise the difference so that it will always be in the range 0 ? difference ? 15. This enables us to hide maximum 3 bits in a pixel pair causing less distortion in the stego image. The difference value is revised before being used for estimating number of bits that can be hidden in each pair. This makes detection of exact secret message harder for the steganalyst. Thus an extra layer of security is introduced.