Abstract
In this paper, impact of a Laplacian filter in better watermark recovery in the spatial domain watermarking algorithms has been investigated. A Laplacian filter is an enhancement filter, this filter could be utilized to optimize extraction of the watermark information in spatial domain watermarking. The distinction between the watermark and unwatermarked part is increased by this filter. Thus, watermark could be extracted significantly better by the watermark recovery algorithm. To show effectiveness of Laplacian filter on the spatial domain watermarking algorithms, it is applied on a typical correlation based method. Several experiments are done to show that performance of correlation based watermarking algorithm is improved by applying this filter before watermark extraction procedure.
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