USB摄像头双目视觉胸径测量实证研究

Empircal study on diameter at breast height measurement of binocular vision in USB camera

立木胸径是森林资源清查中的一项重要指标,它是计算森林蓄积量和衡量林木生长状况的重要依据。三维重建测量物体是近年来计算机视觉领域研究的新热点。将低成本的USB摄像头双目视觉尝试运用到立木胸径测量中,通过摄像机标定参数和视差图获取三维点云,用C++语言结合Open CV实现了从三维点云中提取和计算胸径的方法。并选取华北落叶松进行胸径测量,将测量结果与胸径尺进行比较结果表明胸径测量精度可达到95.3%,可满足国家对森林资源清查的精度要求。

Diameter at breast height is an important indicator of forest inventory, which is an important basis for the calculation of forest stock and measurement of forest growth conditions, It is a new hot research spot in the computer vision field in recent years which measure the object by using three-dimensional reconstruction. In this article, using USB camera binocular vision to measure the Diameter at breast height, and in order to get the 3D point cloud, using camera to calibrate parameters and get deep images. At the same time, using OpenCV and C ＋＋ get the methods for extracting and calculating Diameter at breast height from the 3D point cloud. This trial measured 10 Larix principis-rupprechtii, and compared measurement results with DBH （ diameter at breast height） ruler, as a result, measurement accuracy of Diameter at breast height by binocular vision can reach 95.3%, and it is fully meet the country＇ s accuracy request of forest inventory.