Extraction Method of Laser Stripe Center Line on Metal Workpiece Surface
A robust laser stripe centre extraction method is proposed to address the problem of severe noise such as scatter and synthetic scatter in strongly reflective surface light stripe images.The method first uses an image enhancement algorithm to enhance the granular shape of the scatter noise and to enhance the effective light stripes.A window slider is used to traverse all pixel points in a raster scan to collect local image features,the initial center point and the region of in-terest containing effective light stripes based on this is determined,and the laser stripe segmentation is extracted based on the morphological features of the light bar.Finally,the normal direction of the light stripe is calculated by using the second moment with the initial center point as the geometric center,and the sub-pixel position of the center point is determined by the gray-scale center of gravity method in the normal direction.The experimental results show that the method can effective-ly suppress the interference of scattering noise,has strong robustness,and the error of 3D reconstruction of the point cloud is less than 0.03mm,which ensures the measurement accuracy of the system.
center extractionsecondary momentgravity center methodmetal surfacethree-dimensional measure-ment