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In order to develop a system robust to global shape vari-ations, we extract features from local zones of the signatureimage. For this, the image is either divided into zones usinga fixed number of rectangular grids in Cartesian coordinatesor using a circular tessellation around the origin point in po-lar coordinates. A sample signature, overlaid with a 10x20rectangular grid is shown in Figure1where the signature ispadded with space (shown in gray) to make it fit the grid.An example of the polar grid where the origin is selected asthe centroid of the signature is shown in Figure2.Thesizeof rectangular grid is selected as 10x20, whereas the num-ber of angular bins used in the polar system is selected as12, and that of distance bins is selected as 15. Grid sizes arefound experimentally on a separate validation set, though infuture it might be better to use bigger zones for space andtime efficiency
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