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3D Modeling Of A Document Surface Topography With A Photometric Stereo Method

In this study, a photometric stereo method, which can model the three dimensional surface topography of documents, is proposed. With the creation of high quality threedimensional model, it is aimed to better analyze the security features, pen tip strokes and other impressions on paper by document examination experts. Compared to 2D document images, modeling the three-dimensional surface topography of documents provides us more sufﬁcient information for solving the order of writing (if two lines partially crossed), detecting the destruction of writings, analyzing the change of pressure, and author determination. Experimental studies show that the proposed method can make the three-dimensional model of the document surface topography precise and successful at micron levels.