STEGANOGRAPHIC METHODS IN SPATIAL DOMAIN- OPTIMAL PIXEL PAIR MATCHING AND DIAMOND ENCODING

This paper describes a novel method of data embedding based on Pixel Pair Matching(PPM).In this paper we have implemented two methods for hiding data, firstly is Optimal Pixel Adjustment Process (OPAP,)where pixel x is embedded in k-bits of message m, using Least Significant Bit (LSB) substitution method by adjusting stego pixel at optimal level. Secondly, is Diamond Encoding (DE),the important parameter used for embedding the data in DE is Diamond Characteristic Value(DCV),which conceals secret digit in N-ary notational system when k ≥ 1.Comparison and Experimental results of OPAP and DE not only demonstrates acceptable image quality but also provides significant improvements for different payloads. Diamond shape reveals that it is selective to specific notational system but large amount of data can be embedded in the cover image maintaining imperceptible stego-image quality