Capacity Enlargement Of The PVD Steganography Method Using The GLM Technique

In most steganographic methods, increasing in the capacity leads to decrease in the quality of the stego-image, so in this paper, we propose to combine two existing techniques, Pixelvalue differencing (PVD) and Gray Level Modification (GLM), to come up with a hybrid steganography scheme which can hide more information without having to compromise much on the quality of the stego-image. Experimental results demonstrate that the proposed approach has larger capacity while it’s results are imperceptible. In comparison with original PVD method criterion of the quality (PSNR) is declined by 2%(in decibel scale) averagely while the capacity is increased around 25%. KEYWORDS—STEGANOGRAPHY; SECURITY; DATA HIDING; GLM; PVD