Method of Skull-photo Overlay Based on Curve Matching
Jin Wu-xi · Jisuanji fangzhen · 2013
In order to solve the problem of artificially marking features in skull-photo overlay process, a method of skull-photo overlay based on curve matching was proposed according to the theory of Image Registration and forensic science: Firstly, unify and locate 3D skull model in the standard Frankfurt coordinate system, and map the model to 2D skull; Then, automatically locate the subnasal point and extract the partial contour curve in face and photo image, employ Unsigned Curvature Integration(UCI)method to parameterize the two curves, and the partial contour curve of the face photo in consistence with skull's mandible was found using means of whole-to-part curve matching; Thirdly, employ the updated Procrustes Analysis to evaluate the optimal transformation of two curves; At last, the 2D skull was converted based on the gained transformation and the best overlay state was achieved. The experiment shows that this method can realize the process of skull-photo overlay automatically, has low time complexity and lays a foundation for automatic craniofacial superimposition of identity authentication.