Block transformed with distinctly coded multiple image bit watermarking for secure mobile communication (BTDCMIBWSMC)

Abstract

The paper highlights a novel transformation based differently coded separate image bit watermarking concept with various series of secret bit sequencing for the multiple hidden images achieving stronger robustness and authentication scenarios. First three pixel bytes of the 2×2 non-overlapping sub blocks of the cover image is mutually transformed followed by the distinct encoding of the resultant integer values whereas the fourth pixel byte is spatially coded for single bit hiding on each of them. Randomized position and range driven bit insertions are adopted on these integer bytes for tackling the secure coding cum robustness issues against attacks. Reverse transformation on the bit embedded first three pixel bytes would actually ensure spatial watermarked values while the receiver exercises the same forward block transformation and respective decoding mechanism to extract the hidden bits. Experimental results have confirmed better watermark imperceptibility and robustness against attacks suiting the scheme for public mobile applications.