Study on Train Wheel Surface 3D Reconstruction by Wavelet Transform Profilometry

摘要

In this paper, wavelet transform profilometry (WTP) is used to achieve a train wheel surface 3D reconstruction and defects inspection. A sinusoidal stripe illumination is projected onto the train wheel to be inspected, and the CCD camera captures the deformed image of stripe. The deformed stripe image is transformed by the Complex Morlet wavelet, and maximum value of wavelet transform ridge is extracted to achieve a higher accuracy of wrapped phase. Simulation and validation test on CRH train wheel is done to verify the feasibility of the method. Different kinds of phase unwrapping algorithm and mother wavelet are comparatively studied to get a better performance of wheel surface 3D measurement.