基于智能手机方位传感器的叶面积测量校正

发布时间：2018-03-27 23:25

本文选题：叶面积　切入点：针孔相机模型　出处：《中国农业大学学报》2017年06期

【摘要】：针对使用智能手机野外测量叶面积时很难保证主光轴与叶平面垂直导致测量精度下降的问题,采用针孔相机模型和数字图像处理技术相结合的方法,对叶片平面和手机平面存在夹角时的叶面积测量建立误差校正模型并进行研究。1)以10片不同大小的椭圆形模拟叶片对开发的android App进行仿真测试,结果显示,叶面积测量值与理论值之间的决策系数高于97%,并且随着叶片与手机平面夹角的增大而减小,校正后的相对误差为-6%~8%,未校正的高达41.4%。2)以向日葵、番茄、辣椒和茄子等植物叶片对误差校正公式进行验证,结果显示,当夹角15°,拍照高度为30~65cm时,叶面积测量的相对误差为-6%~6%,未校正的为-27.5%~25%。
[Abstract]:In order to solve the problem that it is difficult to ensure that the measuring accuracy is decreased due to the perpendicularity between the main optical axis and the leaf plane when using the smart phone to measure the leaf area in the field, the method of combining the pinhole camera model and digital image processing technology is adopted. The error correction model of the blade area measurement with the angle between the blade plane and the mobile phone plane is established and studied. 1) the developed android App is simulated and tested with 10 elliptical simulated blades of different sizes. The results show that, The decision coefficient between the measured value of leaf area and the theoretical value is higher than 97, and decreases with the increase of the angle between the blade and the plane of the mobile phone. The relative error after correction is -6and 8cm, and the uncorrected value is up to 41.4. 2) for sunflower, tomato, The error correction formula of pepper and eggplant leaves was verified. The results showed that when the angle was 15 掳and the height of photograph was 30~65cm, the relative error of leaf area measurement was -6 and that of uncorrected leaf area was -27.50.25.
【作者单位】：北京林业大学工学院;中国农业大学信息与电气工程学院;德国波恩大学农业工程研究所;
【基金】：中央高校基本科研业务费专项资金(2015ZCQ-GX-03) 国家自然科学基金面上项目(31371537)
【分类号】：TP212.9;TP391.41

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