应用智能终端的立木高度测量方法

Tree Height Measurement Method with Intelligent Terminal

结合图像处理、单目视觉、近景摄影测量等技术和光学成像原理,研究应用智能终端的立木高度测量方法。文中以Android智能手机为例,利用单目的智能终端设备采集单株立木图像信息,结合图像显著性分析法和Canny算子获取立木图像边缘,根据阈值突变三点法获取立木图像感兴趣区域;提出一种带有非线性畸变项的相机标定模型和应用点运算的透视畸变校正模型的立木高度测量方法,借助校正图像边缘阈值突变最值点和目标物距获取立木高度。经试验验证,文中研究方法立木高度测量结果误差均小于6.5%,符合森林资源调查要求中立木高度测量的精度,可以运用于实际的立木高度测量。

Combining with image processing,monocular vision,close range photogrammetry and optical imaging theory,we studied the measurement method of standing height with intelligent terminal.Taking Android smart phone as an example,single purpose intelligent terminal equipment was used to collect single tree image information,combining image saliency analysis method and Canny operator was used to get the edge of standing tree image,a threshold mutation three point method was used to obtain the region of interest in the tree image,and a camera calibration model with non-linear distortion term and based on the camera calibration model was proposed.The height measurement method of perspective distortion correction model for point operation was conducteet by correcting the threshold value of the image edge threshold and the target object distance to get the standing height.After experimental verification,the error of the height measurement results of this method was less than 6.5%,which was in line with the accuracy of height measurement of tree height in the requirements of forest resources investigation.Therefore,tree height measurement method with intelligent terminal can be applied to the actual height measurement of standing trees.