Indian Journal of Science and Technology
DOI: 10.17485/ijst/2014/v7i4.12
Year: 2014, Volume: 7, Issue: 4, Pages: 517–524
Original Article
Mehdi Alirezanejad1*, Vahid Saffari2 , Saeed Amirgholipour3 , Aboosaleh Mohammad Sharifi3
1 Department of Computer,Firuzkooh Branch, Islamic Azad University,Firuzkooh, Iran; m_arn2004@yahoo.com
2 Department of Computer, Collage of Engineering, Shiraz branch, Islamic Azad University, Shiraz, Iran; Saffari@iaushiraz.ac.ir
3 Department of Computer, Ramsar Branch, Islamic Azad University, Ramsar, Iran; s.kasmani@gmail.com, sharifi@iauramsar.ac.ir
Generally, High Boost filter is used to emphasize high frequency components representing the image details without eliminating low frequency components representing the basic form of the signal. The dissimilarity between the watermark and unwatermarked parts of the image are increased by this filter. Thus, watermark could be recovered significantly better by recovery algorithm. In this paper, a comparison is taken place between the effects of different places of preforming High Boost filter on the reliability of the recovery methods in spatial domain image watermarking. This filter is convolved in two different places in the watermark extraction algorithm; before running the watermark extraction and before calculate the correlation in the middle of extraction. This paper concentrate to conclude which of these places is more proper to convolve this filter. A classic correlation based method is used as a representative of spatial domain watermarking. Several experiment are done to show which one of this places is more proper for preforming proposed filter.
Keywords: Correlation Based Watermarking, Digital Image Watermarking, High Boost Filter, Spatial Domain Watermarking
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