期刊名称：International Journal of Computer Science & Technology
印刷版ISSN：2229-4333
电子版ISSN：0976-8491
出版年度：2013
卷号：4
期号：1
页码：133-140
语种：English
出版社：Ayushmaan Technologies
摘要：In recent years the study of watermarking using CDMA technique in transform domain is a widely popular method. We incorporated modification in existing algorithm with improved imperceptibility of embedded image while making it capable to extract the hidden image by using correlation technique. The original cover image is decomposed in two stages, firstly into appropriate mid-frequency sub-band and secondly into three hierarchical levels of DWT. The logo image is scrambled by PN sequence and then it is embedded in the decomposed cover image. The wavelet coefficients are chosen experimentally for better imperceptibility and robustness against intentional attacks. The result shows a remarkable improvement over the existing methods using similar technique.
