[1] Xiong Y L,Steven S A.Depth from focusing and defocusing[C]//Processing of IEEE Computer Society Conference on Computer Vision and Pattern Recognition.New York:The Intl Conf of Comp,1993:68-73
[2] Chen Chih-ming,Hong Chin-ming,Chuang Han-chun.Efficient Auto-Focus Algorithm Utilizing Discrete Difference Equation Prediction Model for Digital Still Cameras[J].IEEE Transactions on Consumer Electronics,2006,52(4):1135-1143