Monocular Vision Measuring System for Flight Spin Based on Geometric Feature

Because the projection transformation from 3-D to 2-D is irreversible, it can’t get the 3-D information of the unknown object from 2-D image. However, the measured object in the spin flight test is known in advance, their geometric features can be acquired before measurement. Based on the geometric features of the measured object, measuring its space information using monocular vision is the research content of this paper. It presents the measurement model of monocular vision based on pinhole camera model. A method of feature points extracting and matching based on threshold segmentation is adopted. Finally a set of experimental data of spin test is given. The experimental result showed that the position and attitude of the model plane can be retrieved from known geometric feature and 2-D image. The occlusion of feature-point and distance between feature-points has great influence on the measurement precision.