使用图像分析法测量叶面积指数和植被覆盖率

Measurement of the Leaf Area Index and the Percentage of Vegetation by Using Image Analysis

本文介绍了使用普通数码相机并用常用的图像处理软件测量叶面积指数和植被覆盖率的方法,阐明摄像和图像处理的基本要求及人工干预操作。讨论了摄像机高度和倾斜角对测量植被覆盖率结果的影响。认为比较可靠的方法是使用固定小倾斜角的支竿或支架,用改变高度调节取样面积。还叙述了在测量植被覆盖率时如何选择分辨率及其影响。本文涉及测量叶面积的方法只适用于普通草和作物。

This paper presents the method of how to measure the leaf area index and the percentage of vegetation by using the general digital camera and image processing most in use. It clarifies the basic requirement of camera and image processing as well as artificial intervention. The effects of the height and the slope angle of camera.is discussed. The relative reliable way is using fixed minor slope angle of supporting rod or trestle and changing the height of camera to obtain different sample area. It also narrates how to select resolving power as well as effects in the measurement of the percentage of vegetation. The method of how to measure the leaf area index which the paper inwlves only applicable to general weeds and crops.