Measurement and Calculation Methods of a Stem Image Information

The paper shows a study on 2-D stem image information collected by a digital camera. Information on a single stem is obtained through calculations after the application of the direct linear transformation model of close-range photogrammetry and binocular stereo vision technology, so that the calculating problem between stem image information and its 2-D coordinate can be solved. Furthermore, the 2-D processing methodology for measuring tree image information simplifies calculating equations and increases calculating speed. Although computer stereo vision techniques for collecting parameters of a single stem shape are comparative, complicated, and expensive, research indicates the efficiently and feasibility of close-range photogrammetry for stem image information. Translated from the Journal of Beijing Forestry University, 2005, 27(1) (in Chinese)