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Saffari, Vahid
- Effect of Locations of Using High Boost Filtering on the Watermark Recovery in Spatial Domain Watermarking
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Authors
Affiliations
1 Department of Computer,Firuzkooh Branch, Islamic Azad University,Firuzkooh, IR
2 Department of Computer, Collage of Engineering, Shiraz branch, Islamic Azad University, Shiraz, IR
3 Department of Computer, Ramsar Branch, Islamic Azad University, Ramsar, IR
1 Department of Computer,Firuzkooh Branch, Islamic Azad University,Firuzkooh, IR
2 Department of Computer, Collage of Engineering, Shiraz branch, Islamic Azad University, Shiraz, IR
3 Department of Computer, Ramsar Branch, Islamic Azad University, Ramsar, IR
Source
Indian Journal of Science and Technology, Vol 7, No 4 (2014), Pagination: 517-524Abstract
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 WatermarkingFull Text
- Effect of Laplacian of Gaussian Filter on Watermark Retrieval in Spatial domain Watermarking
Abstract Views :200 |
PDF Views:0
Authors
Affiliations
1 Department of Computer, College of Engineering, Shiraz Branch, Islamic Azad University, Shiraz, IR
2 Department of Computer, Babol Branch, Islamic Azad University, Babol, IR
3 Department of Computer, Firoozkooh Branch, Islamic Azad University, Firuzkooh, IR
1 Department of Computer, College of Engineering, Shiraz Branch, Islamic Azad University, Shiraz, IR
2 Department of Computer, Babol Branch, Islamic Azad University, Babol, IR
3 Department of Computer, Firoozkooh Branch, Islamic Azad University, Firuzkooh, IR
Source
Indian Journal of Science and Technology, Vol 8, No 33 (2015), Pagination:Abstract
Laplacian of Gaussian filter (LOG) is an enhancement filter with less sensitivity to noise that is used for sharpening an image. The watermark is added as a noise to the host image in watermarking. The principal objective of this paper is to enumerate the beneficial effects of the LOG filter on watermark retrieval in spatial domain watermarking. This filter is applied before the extraction algorithm on the watermarked image which might be attacked. The distinction between the watermark and original image is increased by this filter. Thus, the probability of the watermark detection is augmented by it. Several image processing attacks is done to evaluate the effect of this filter on correlation based spatial domain watermarking. The effect of this filter on watermark recovery is statistically significant. The detection rate in noise addition and blurring is significant in compare with the similar method. However, the improvement in detection rate is also better in other common image processing attacks.Keywords
Correlation Based Watermarking, Digital Image Watermarking, Laplacian of Gaussian, Spatial Domain Watermarking.Full Text