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. Author manuscript; available in PMC: 2013 Mar 5.
Published in final edited form as: Proc Int Conf Image Anal Process. 2009;5716:692–700. doi: 10.1007/978-3-642-04146-4_74

Fig. 4.

Fig. 4

Most relevant bins of 2D histograms of azimuth and elevation angles of surface normal vectors on 3D head mesh models. As the severity of flatness increases on the side of the head, the peak in the 2D histogram becomes more prominent