Subpixel Accuracy for Extracting Groove Center Based on Corner Detection

Abstract

Subpixel accuracy for V-groove center in robot welding is researched and a software measure to increase the accuracy of seam tracking by laser is presented. LOG (Laplacian of Gaussian) operator is adopted to detect image edge. V-groove center is extracted by corner detection of extremum curvature. Subpixel position is obtained by Lagarange polynomial interpolation algorithm. Experiment results show that the method is brief and applied, and is sufficient for the real time of robot welding by laser sensors.