期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2014
卷号：60
期号：3
出版社：Journal of Theoretical and Applied
摘要：Image Watermarking is a technique by which a person can attach hidden data into the image by use of embedding and extraction process. In reversible watermarking, after the extraction of the watermark, the cover image can be restored completely. Reversible image watermarking algorithm is proposed in this paper. Initially, the image is resized and applied bi-orthogonal discrete wavelet transform to decompose into bands. The best band suitable for embedding is found with the help of entropy. The best locations in the selected band are found using the importance measure model. Subsequently, the proposed embedding process is carried out to embed the image with a watermark image which is binary. The proposed extraction procedure is carried out after finding out best band and location. The evaluation metric used to evaluate the proposed watermarking technique is carried out with the use of PSNR and NC. The proposed technique obtained good results having an average PSNR value of 31.3 and NC value of 1. The robustness of the proposed watermarking technique is evaluated with the aid of different filtering techniques and good results were achieved in all cases. Comparison is also made with existing technique and from the results; we can see that our technique outperforms other technique by having better PSNR and NC values.
