5Cho i K, L ee G, Han Y J, et al. Tomato maturity evaluation using color image analysis. Trans of the ASAE, 1995, 38 (1) :171 - 176.
6Mayer G E, Davion DA. An Eleetrortic Image Plant Crowth Measurement system. Tramaetion of ASAE, 1987, 30( 1 ) :242 - 248.
7Trooien T P, Heerraann D FI Measurement and simulation of Potato Leaf Area Using Image Processing Measurement. Transaction of the ASAE, 1992, 35(5) :1719 -1721.
8Casady W, Singh N, Costello TA. Machine vision for measurement of rice canopy dimensions . Trans of the ASAE, 1996, 39(5) : 1891 - 1898.
9Shimizu H, Heins R D. Computer vision based system for plant growth analysis. Trans of the ASAE, 1995, 38 (3) : 958 - 964.
10Dongxian He. Development of a plug -transplant production system and image analysis system for use in sweet potato. Japan: Chiba University, 2002.