Measuring Method of Tree Height Based on Digital Image Processing Technology

In order to establish a set of tree height measuring system, on the basis of digital image processing, this paper discusses a new method. An ordinary digital camera was used to get tree photos and two marker points were chosen in the camera´s field of view on the tree. One marker point was set on the root of the tree; the other was set one meter high from the root. A tripod was used to fix the camera for taking photos of the tree. It made the photo perpendicular to the ground. The computer may extract the coordinates of the two marker points and the top point according to their color features during image processing. Lastly, the tree height can be worked out using triangle similarity theory. The experimental results indicate that the relative measurement error of tree height is about 4%. So it is a viable method.