2Lang H T,Xie C R,Qi X,et al.Seal forgery detection by geometric consistency[C]//Proceedings of Information:An International Interdisciplinary of Journal.Japan:International Information Institute,2012:3695-3699.
3Pan W,Hu J.Seal imprint segmentation based on color feature classifier[C]//International Conference on Proceedings of Audio,Language and Image Processing.Shanghai,China:IEEE,2012:837-840.
4Wang X,Chen Y.A novel seal imprint verification method based on analysis of difference images and symbolic representation[G].LNCS 6540:Computational Forensics,2011:56-67.