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%。 Aiming at the problem of measuring the leaf area with a smart phone, it is difficult to ensure that the main optical axis and the leaf plane are perpendicular to each other, which leads to a decrease in measurement accuracy. A pinhole camera model and a digital image processing technique are combined to form an angle When the leaf area measurement error correction model is established and studied. 1) Simulation test of the developed Android App with 10 oval-shaped simulated leaves of different sizes showed that the decision coefficient between the measured value of the leaf area and the theoretical value was higher than 97%, and as the angle between the blade and the plane of the mobile phone The relative error after correction is -6% ~ 8%, uncorrected up to 41.4%. 2) The error correction formula of plant leaves such as sunflower, tomato, pepper and eggplant was validated. The results showed that the relative error of leaf area measurement was -6% ~ 6 when the angle was less than 15 ° and the height was 30 ~ 65 cm %, Uncorrected -27.5% ~ 25%.