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- Title
DBH measurement method based on tree images taken by single-CCD camera mounted on theodolite.
- Authors
HOU Xin-xin; TAN Yue-sheng; QIAN Hua; CHENG Peng-le
- Abstract
This paper presented a kind of measurement method based on the tree images taken by a single CCD camera mounted on a theodolite. Based on the tree images, it employed some approaches,including threshold segmentation, open computing, and edge detection, to extract the two-dimensional coordinates of the DBH; using the theodolite gathered space angle information, coordinate transformation among the theodolite rotating coordinate system, the camera optical center coordinate system and the image coordinate system, was made to get the three-dimensional coordinates of the DBH, with which the diameter at the breastheight size could be figured out. It took the breast-height diameters of 8 trees in the experiment, and the mean absolute error was 7. 36 mm, while the mean relative error was 2. 46%, which could completely meet the accuracy requirements. The results of the experiments show that the single CCD camera and the theodolite use in DBH measurement method is feasible.
- Subjects
CCD cameras; THEODOLITES; MONOCULAR vision; IMAGE processing; IMAGE segmentation; OPTICAL measurements
- Publication
Application Research of Computers / Jisuanji Yingyong Yanjiu, 2014, Vol 31, Issue 4, p1225
- ISSN
1001-3695
- Publication type
Article
- DOI
10.3969/j.issn.1001-3695.2014.04.064