Signature Verification

Feature Extraction• Local features– Spatial: static features extracted from the shape of thesignature• Change of the distance between two consecutive points (δx,δy)• Absolute y coordinate (y)• Sine and cosine of the angle with the x axis (sin α and cos α)• Curvature (β)• Grey values in a 9x9 pixel neighborhood– Temporal: features using the ordering (timing) of thesignature• Absolute and relative speed at each re-sampled point• Absolute and relative speed between two critical points– Pressure value