中文摘要：

为提高林木胸径测量精度,减少劳动负荷,结合光学三角形法、图像处理及最小二乘拟合法,研究一种新的立木胸径测量方法。通过理论分析制定算法,搭建测量系统,对5株不同径级的立木进行测量计算,实验结果表明,采用光学三角形法的测量算法计算的直径精度较高,误差一般小于22 mm,相对误差率小于5.5%。

英文摘要：

In order to improve the measuring accuracy of tree＇ s diameter at breast height （DBH） and decrease the working load, an algorithm for measuring tree＇ s DBH was proposed by combining the optical triangular method, image processing and least square fitting. The algorithm was proposed based on a series of theory analysis, and the measuring system was built up. Five trees with different diameters at breast height were measured and calculated. The testing result showed that the optical triangular method had higher accuracy, the error was less than 22 mm, and the relative error was less than 5.5%.