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Primal sketch performs an important role in early vision. In this paper, we propose a novel method to obtain the primal sketch of natural images by integrating empirical mode decomposition (EMD) techniques and image gradient. 2D EMD approach can decompose the image into a finite number of intrinsic mode functions (IMF), and each one represents the original image in a different scale, with the 1st IMF representing the finest scale. To enhance the information represented by the IMF, we multiplydoi:10.1109/icpr.2006.717 dblp:conf/icpr/DaiZX06 fatcat:mfs7mhuulneejeewlpt77gxf2m