Wang Lei, male, born in 1977. He got his MSc from Xiamen University in 2002. Now he is a doctor student in Hefei University of Technology. His major interesting field is vision measurement.E-mail : wangleiwangleimail@ hotmail.com Gao Jun, male, born in 1963, in Huainan, Anhui province, obtained doctor degree from University of Science and Technology of China. He is a professor and doctor supervisor in Hefei Univer- sity of Technoogy, his major fields are intelligent information procesing and machine vision. E-mail : gaojun@ hfut. edu. cn