Method for 3D motion recovery of non-rigid object with point features

In order to obtain 3D moving trajectory of non-rigid object with point feature, two calibrated high-speed cameras were used. A practical 3D motion recovery method of non-rigid object with point feature was proposed. The method included image spatial reconstruction, temporal series reconstruction and other steps. The spatial reconstruction and temporal series reconstruction were the core of 3D motion recovery. In spatial reconstruction, the coordinates of the points on the image were obtained by using ellipse fitting method, and the matching points were searched according to the Mahalanobis distance. Then, triangulation was used to calculate the 3D points. In the aspect of temporal series reconstruction, the searching method was used to match the coordinates of the points between sequential images. So, the 3D motion recovery of the movement process was realized. Then, the reconstruction result was used to calculate the parameters, such as speed, acceleration and curvature change of the non-rigid object. The experimental result shows that the method improves the speed and accuracy of the spatial matching and realizes the temporal series matching simply and effectively. What's more, the time of the whole reconstruction process is reduced. Through the reconstruction of the target, the 3D motion data of the object is obtained accurately.