A Novel Genetic Algorithm Based Data Embedding Technique in Frequency Domain Using Z Transform (ANGAFDZT)

In this paper a transformed domain based gray scale image authentication/data hiding technique using Z transform (ZT) termed as ANGAFDZT, has been proposed. Z-Transform is applied on 2 x 2 mask of the source image to transform into corresponding frequency domain. Four bits of the hidden image are embedded in each mask of the source image. Resulting image masks are taken as initial population. New Generation, Crossover and Mutation are applied on the initial population to obtain stego image. Genetic algorithm is used to enhance the security level. During the process of embedding, dimension of the hidden image followed by the content of the message/hidden image are embedded. Reverse process is followed during decoding. High PSNR obtained for various images compared to existing Chin-Chen Chang et al.[1] conform the quality of invisible watermark of ANGAFDZT.

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