Indian Journal of Science and Technology

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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.
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