南京林业大学学报（自然科学版）
The extraction method of leaf image based on the active contours
LI Yunfeng, CAO Yukun, ZHU Qingsheng
JOURNAL OF NANJING FORESTRY UNIVERSITY . 2009, (03): 146 -150 .  DOI: 10.3969/j.jssn.1000-2006.2009.03.034

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