在传统线结构光测量技术的基础上,提出了一种基于偏振融合的钢轨廓形线结构光成像方法。利用偏振相机获取钢轨激光断面多个角度的偏振分量图像和总量强度图像,结合偏振分量图像和总量强度图像中光条信息的相关性和互补性,构建了基于光条信度评价的图像融合算法,基于融合图像提高了钢轨激光断面的成像质量。使用打磨后的钢轨进行实验论证,结果表明:由偏振分量图像和总强度图像得到的融合图像中,光条不再出现局部过曝现象,光条质量得到有效改善。与传统方法相比,过曝区域的钢轨廓形的最大测量误差由0.31 mm下降到0.10 mm,有效提高了钢轨廓形检测的准确度。

Based on the traditional line-structured light measurement technology, we proposed a line-structured light imaging method of rail profile based on polarization fusion. First, the polarization component images and total intensity images of rail laser section at multiple angles were obtained by using a polarization camera. Furthermore, combining the correlation and complementarity of light strip information in the polarization component images and total intensity images, we constructed an image fusion algorithm based on the evaluation of light strip reliability, which improved the image quality of rail laser section. In addition, the experimental demonstration using the polished rails indicated that in the fused images of polarization component images and total intensity images, there was no longer local overexposure of light strip and the quality of light strip was improved. In comparison with the traditional method, the maximum measurement error of rail profile in the overexposed area was reduced from 0.31 mm to 0.10 mm, effectively improving the accuracy of rail profile detection.