[3] [3] Kang-Sun Choi,Jun-Suk Lee,Sun-Jae Ko.New autofocusing technique using the frequency selective weighted median filter for video cameras[J].IEEE Transactions on Consumer Electronics,1999,45:820-827.

[8] [8] CHEN Guo-jin,ZHU Miao-fen,WANG Ya-ka.An improved auto-focusing algorithm based on autocorrelation[A].CIICT06[C].Hangzhou:Hangzhou Dianzi University,2006:25-28.

[9] [9] CHEN Guo-jin,ZHU Miao-fen,GUAN Li-ming,et al.Implementing the auto-focusing system based on the digital image process technology[A].Proceedings of IEE Irish Signals and Systems Conference[C].Dublin,Ireland:IEE CONFERENCE PUBLICATION,2005,511:92-95.

[10] [10] CHEN Guo-jin,ZHANG Ke-song,GONG Ye,et al.Research on image definition function using in real time auto-focusing system[A].Proceedings of Fifth International Symposium on Instrumentation and Control Technology[C].Beijing,China:SPIE,2003,5253:466-470.

[11] [11] CHEN Guo-jin,ZHU Miao-fen,GUAN Li-ming,et al.Study on contrast evaluation function of CMOS digital camera[A].Proceedings of the 2005 IEEE/ASME International Conference on Advanced Intelligent Mechatronics[C].Monterey,California,USA:IEEE,2005:379-383.

[12] [12] Cheol-Hee Park,Jong-Ho Paik,Young-Hwan You,et al.Auto focus filter design and implementation using correlation between filter and auto focus criterion[A].ICCE Digest of Technical Papers[C].[S.l.]:IEEE,2000:250-251.

[13] [13] HOU Zheng-xin,WANG Wen-guan,CHU Jing-hui.A kind of 2D isotropic wavelet and its application in image primitive detection[J].Journal of Circuits,Systems and Computers,2002,11(2):123-135.

[14] [14] ENG How-lung,MA Kai-kuang.Noise Adaptive Soft-Switching Median Filter[J].IEEE Trans.Image Processing,2001,10(2):242-251.

[15] [15] Getzlaff S,Schreiter J,Graupner A,et al.A system-on-chip realization of a CMOS image sensor with programmable analog image preprocessing[A].The 2001 IEEE International Symposium on Circuits and Systems[C].Sydney,NSW,Australia:IEEE,2001,4:486-489.

[16] [16] Fleming B J W,YU D,Harrison R G D Jubb.Wavelet-based detection of coherent structures and self-affnity in financial data[J].Eur.Phys.J.B,2001(20):543-546.