一种应用于复杂场景的线结构光激光中心线提取方法

Method for extracting centerline ofline structured light in complex scenes

线结构光激光中心线提取是线结构光三维测量的关键技术之一,其提取精度对系统测量精度有决定性影响。实际三维测量中,相机采集图像受物体表面反射率等因素的影响,给激光中心线提取增加了难度,针对这一问题,提出了一种结合灰度重心法的改进提取方法。该方法基于连通域分析去除背景光条和噪声区域,接着基于线宽分布实现局部形态学处理,最后结合灰度重心法计算出激光中心线的亚像素位置。该方法的中心线计算精度相较于改进前提高了约60%,在条纹图像出现过曝光和欠曝光区域仍能比较准确提取激光中心线的位置,可以适应复杂环境的考验,能够保证激光中心线提取工作的稳定性和精确性。

Laser centerline extraction of line structured light is one of the key technologies in three-dimensional measurement of line structures light,and its extraction accuracy has an importantimpact on the measurement accuracy of the system.In actual 3D measurement,the image captured by the camera is affected by various factors such as the surface reflectivity of the object,which increases the difficulty of extracting laser centerlines.To address this issue,an improved extraction method combining grayscale centroid method is proposed.This method is based on connected domain analysis to remove background light bars and noise areas,and then implements local morphological processing based on linewidth distribution.Finally,the sub-pixel position of the laser centerline is calculated using the grayscale centroid method.The centerline calculation accuracy of the proposed method has improved by about 60%compared to traditional method.It can still accurately extract the position of the laser centerline in areas with overexposure and underexposure in stripe images,which can adapt to the test of complex environments and ensure the stability and accuracy of the laser centerline extraction work.