期刊名称：Indian Journal of Computer Science and Engineering
印刷版ISSN：2231-3850
电子版ISSN：0976-5166
出版年度：2010
卷号：1
期号：4
页码：295-300
出版社：Engg Journals Publications
摘要：This paper presents digital watermarking methods for authorization against copying or piracy of color images. Watermarking is a very important field for copyrights of various electronic documents and media. With images widely available on the Internet, it may sometimes be desirable to use watermarks. Digital watermarking is the processing of combined information into a digital signal. A watermark is a secondary image, which is overlaid on the host image, and provides a means of protecting the image. This paper presents the survey on digital watermark features, its classifications and applications. Various watermarking techniques have been studied in detail in mainly three domains: spatial, frequency and statistical domain. In spatial domain, Least-Significant Bit (LSB), SSM-Modulation-Based Technique has been developed. For DCT domain, block based approach and for wavelet domain, multi-level wavelet transformation technique and CDMA based approaches has been developed. The Discrete Wavelet Transform (DWT) is currently used in a wide variety of signal processing applications. This paper also presents the various error matrices for analyses the robustness of watermarking method.
