A Multi-Line Laser Scanning System Design and Evalu-ation Framework based on Physical Simulation

Abstract:

Precise 2D center extraction of laser stripes is essential in industrial applications. However, evaluating the extracted centers with 2D actual coordinates in accurate setups relies on expensive reference instruments. To simplify the evaluation process, we propose a multi-line laser simulation system utilizing computer graphics and physical simulation to generate virtual multi-line laser datasets. Our framework provides key physical properties of the scene, including camera parameters, depth values, surface normal, and the actual 2D and 3D coordinates of the laser stripe centers for each rendered image. Beyond, we construct a virtual line laser scanning image dataset with a complex background by simulating inter-actions between lasers and object surfaces with the Monte Carlo method. With the proposed framework and dataset, a multi-line laser extraction algorithm based on a robust sorting algorithm is proposed and tested, which utilizes distance-based error analysis, connected component labeling, and iterative optimization refinement techniques. Both simulation and actual experiments show that our method outperforms the other state-of-the-art multi-line laser stripe center ex-traction methods. The proposed framework can be applied to different types of laser scanning systems in the future.

Key words:Physical simulation, Multi-Line laser, wheel of train, laser stripe extraction