A Stereo Vision-Based Flexible Deflection Measurement System

This paper aims at measuring deflection of mainly beam structures in a non-contact, installation-free and marker-less way with the aid of stereo vision, edge detecting, projection transformation, spline interpolation among other data processing methods. A measurement scheme covering the hardware system design and data analyzing is proposed. Things relevant to stereo vision mainly convert a position in image to a real world position. The edge detection is used to recognize features in images that are essential for measuring deflection. The projection to a certain plane is a reasonable design due to the structure of the targeted structures. And spline interpolation compensates for the loss of obtaining the coordinates of discrete points of the target object. Then an experiment is carried out. And the result proves the feasibility of the proposed method.