[1] [1] Wang N, Zhang N, Dowell F E Y S, et al. Transactions of the ASAE, 2001, 44(2)： 409.

[2] [2] Alchanatis V, Ridel L, Hetzroni A, et al. Computer and Electronics in Agriculture, 2005, 47： 243.

[3] [3] Goel P K, Prasher S O, Patel R M, et al. Transactions of the ASAE, 2002, 45(2): 443.

[4] [4] Onyango C M, Marchant J A. Computer and Electronics in Agriculture, 2003, 39： 141.

[5] [5] Tillett N D, Hague T, Miles S J. Computer and Electronics in Agriculture, 2001, 32： 229.

[6] [6] Perez A, Lopez F, Benlloch J V, et al. Computer and Electronics in Agriculture, 2000, 25： 197.

[7] [7] Virndts E, De Baerdemaeker J, Ramon H. Precision Agriculture, 2002, 3： 63.

[8] [8] Borregaard T, Nielsen H, Norgaard L, et al. Journal of Agricultural Engineering Research, 2000, 75(4)： 389.

[9] [9] Fevaerts F, Van Gool L. Pattern Recognition Letters, 2001, 22： 667.

[10] [10] Piron A, Leemans V, Kleynen O, et al. Computer and Electronics in Agriculture, 2008, 62： 141.