期刊名称：International Journal of Computer and Information Technology
印刷版ISSN：2279-0764
出版年度：2013
卷号：2
期号：4
页码：688
出版社：International Journal of Computer and Information Technology
摘要：This paper deals with the testing of the robustness of two algorithms for embedding and extraction of digital water- mark into a monochromatic image, based on SVD transfor- mation. The first algorithm was proposed by Liu and Tan [1], and the second, named Technique 1, was proposed by Moham- mad et al. [3]. In the first part of the paper, the influence of the watermark contents on the the image for both algorithms was analyzed. Thus, the optimal scale factor of embedding watermark was determined. Then, the images with the watermark were test- ed under the conditions where various deformations were ap- plied. The robustness was analyzed as well on the basis of objec- tive and subjective parameters. In the second part of paper, im- pulse noise with percentage of 10-50% was added to the water- mark images. Then, an efficient algorithm for impulse noise elim- ination was applied. The watermark was extracted from the re- constructed images and its quality was analyzed on the bas is of subjective and objective parameters. PSNR and correlation coef- ficient rcorr were used as objective parameters. The visibility of the extracted watermark was used as a subjective parameter. On the basis of the results, an estimation of the robustness of the tested algorithms was made
关键词：Image processing; digital watermarking; SVD ; transformation; impulse noise
