17-09-2014, 12:28 PM
DIGITAL IMAGE WATERMARKING USING WAVELET TRANSFORM DOMAIN
DIGITAL IMAGE.pptx (Size: 312.51 KB / Downloads: 10)
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.
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.
Advantages of DWT
Allows good localization both in time and spatial frequency domain.
Better identification of which data is relevant to human perception higher compression ratio
Higher flexibility: Wavelet function can be freely chosen
Disadvantages of DWT
The cost of computing DWT as compared to DCT is higher.
Longer compression time
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.