关键词: 机器视觉, 图像处理, 叶片面积

Abstract: A new method for nursery-leaf area measurement based on imagery processing is introduced.Using RGB tricolor gray value separation theory and 2R-G-B color character parameters to separate the background image，through the iteration theory calculating the best division threshold value，then leaf area is obtained by the leaf’s pixels distribution of image.Respectively measure the 72 leaves area in nursery by the traditional pane method and this method and confirm this method.The relevant analysis result shows that the correlation coefficient R²=0.992 1，the p value is 0.1E-4 when the significant level of 0.05，reaching an extremely remarkable level.This method has the high determination precision and satisfies the leaf area determination request.

Key words: machine vision, image processing, leaf area