Research Of High Accuracy 3D Information Rapidly Obtain Under Visual Guidance

With the increasing requirements on 3D printing, precision manufacturing processing and industrial products quality inspection, to obtain high precise 3D information rapidly is very important. The shape from shading method and rotation symmetric laser triangulation sensor with vision in this article are integrated. The data of shape from shading method which can obtain 3D information rapidly but rough is used to visual guide the rotation symmetric laser triangulation sensor with vision which can obtain high precise 3D information but slow, to measure the points on the object surface which with high 3D gradients.This method not only overcomes the point to point measure method and low efficiency of classical laser triangulation sensor, but also keep the high precise of 3D information.The main contents of this article is as follows:(1) The physical principle and classical method were studied, the disadvantage of the method in moment was analyzed, and the source and pattern of the error of shape from shading were summarized;(2) The measurement system of rotation symmetric laser triangulation sensor with vision was built. A calibration method was designed and the measurement optic system and visual system was calibrated;(3) The data of shape from shading and rotation symmetric laser triangulation sensor with vision was integrated and the error of shape from shading is modified;(4) A visual guidance measurement based on 3D gradients of the surface of objects is archived through the integrates of shape from shading and rotation symmetric laser triangulation sensor with vision, the measurement path is planned and the feasibility and robustness of this method was verified by experiment.