DIGITAL WATERMARKING SCHEMES FOR AUTHORIZATION AGAINST COPYING OR PIRACY OF COLOR IMAGES
Journal Title: Indian Journal of Computer Science and Engineering - Year 2010, Vol 1, Issue 4
Abstract
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.
Authors and Affiliations
Keshav S Rawat , Dheerendra S Tomar
Keywords
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