4LSB BASED DATA HIDING IN COMPLEX REGION OF DIGITAL IMAGES AND ITS EFFECTS ON EDGES AND HISTOGRAM
Sahib Khan1, Muhammad Naeem2, Tawab Khan3, Nasir Ahmad4*
Data hiding in the complex regions of cover image make the use of edges for hiding and communicating secret
information. The complex region in a digital image is the least sensitive to human visual system (HVS) in term of
changes than smooth region. The data hiding in the complex regions affect the edges and the histogram of the image.
These two may cause the existence of hidden information to be detected. In this paper, the effect on image edges
and histogram is investigated when subjected to true edge based 4 least significant bits (4LSB) steganography. The
true edge based 4LSB steganography technique has been found very efficient, creating no significant effect on edges
and undetectable histogram differences. Which prove this technique immune to histogram difference steganalysis. The
quality of the edges is preserved and a PNSR of greater than 74dB has been observed for different cover images
for the true edge based 4LSB steganography. The quality of stego images, edges can been observed qualitatively
and it be seen clearly that no significant changes are introduced due to hiding information in edges using the true
edge based steganography.