Yang Zaihua

A monocular vision 3D measurement method based on rotating lens

In this paper, a monocular vision measurement method based on rotating lens is proposed. A special optical lens is placed between the target and the camera, which causes light refraction during the measurement process. By analyzing images taken after different light refraction, the 3D coordinates of the target can be obtained. Using this method, 3D measurement of the full field can be completed with no laser assisted. Besides the 3D information of a target can be measured without requirements for a priori knowledge of feature points on the target or the location information of the lens. Finally experiments are conducted in the laboratory, and results show that excellent accuracy can be obtained with proposed method.

A photogrammetry pose measurement method for moving targets in a wind tunnel

This article proposes a position and attitude measurement method based on binocular vision for targets in complex wind tunnels. The position and attitude parameters of high-speed rolling targets in complex wind tunnels can be measured with the proposed method. Besides, we considered the influence of image distortion caused by the observation window. A photogrammetry model based on multi-layer refraction is established to improve the measurement accuracy in wind tunnels. Miniature self-luminous units are employed to serve as image features to help achieve high-speed image acquisition in dark wind tunnels. The position and attitude parameters of wind tunnel targets are then calculated according to the 3D coordinates of markers on the target surface. The proposed measurement system and method were applied in real wind tunnel measurements, and results satisfied the measurement demands. Besides, verification experiments were conducted in the laboratory, showing high measurement precision of the system.