Digital Image Watermarking

[seminar class]

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DIGITAL IMAGE WATERMARKING USING WAVELET TRANSFORM DOMAIN
ABSTRACT
we start by first characterizing the most important and distinguishing features of wavelet-based watermarking schemes. Application scenario,copyright protection is considered and building on the experience that was gained, implemented two distinguishing watermarking schemes. Detailed comparison and obtained results are presented and discussed.
Overview
Water marking
 Types of Watermarked Images:
1.Visible watermarking
2.Invisible watermarking
 Discrete Wavelet Transform
 The discrete wavelet transform (DWT) has gained widespread acceptance in signal processing and image compression.
 Recently the TIF committee has released its new image coding standard, TIF-2000, which has been based upon DWT.
 Discrete Wavelet Transform
 2-D DWT for Image
 Discrete Wavelet Transform
 Discrete Wavelet Transform
 2-D DWT for Image
 Discrete Wavelet Transform
 Advantages of DWT
 Allows good localization both in time and spatial frequency domain.
 Better identification of which data is relevant to human perceptionà higher compression ratio
 Higher flexibility: Wavelet function can be freely chosen
Discrete Wavelet Transform
Image Comparison
Disadvantages of DWT
 The cost of computing DWT as compared to DCT is higher.
 Longer compression time
Future scope
 The work presented in this project is not user friendly i.e. one can provide a graphical user interface for the work that has been presented. Also the effective retrieving of the image when passed through a lossy channel can be considered for further work. The compression of the watermarked image can also be considered in this process
Conclusion
 Watermarking has been used as a tool for embedding image for copyright protection. It is also used for transmission of the data securely and also provided assistance to management of information.
Applications
 Broadcast Monitoring (Television news often contains watermarked video from international agencies)
 Copyright protection
 Fingerprinting (Different recipients get differently watermarked content)