时间连续帧信息复用条纹中心快速提取方法

Fast Extraction Method of Stripe Center Based on Time-Continuous Frame Information Multiplexing

线结构光三维测量技术通过逐行扫描工件,计算工件连续轮廓线三维坐标,最终拼接各轮廓线形成完整的三维形貌。为了研究扫描过程中图像连续帧之间的相似性关系,提出一种时间连续帧信息复用的条纹中心快速提取方法,进一步提升线激光光条中心线提取速度。首先,采用自适应光条分割重心提取算法对首帧激光条纹进行中心线坐标计算;然后,在时间连续帧中心线坐标信息的基础上,对当前帧光条图案进行快速光条粗定位;最后,对光条中心线进行亚像素精度计算。该方法根据时间连续帧图像的相似性,进行连续帧光条中心线坐标信息复用,减小重复计算,提高算法速度。实验结果表明,该方法可实现高达133 frame/s的中心线计算速度,大幅提高了结构光三维扫描速度,可应用于其他大型工件的三维重建。

Using threedimensional(3D)measurement technology with linear structured light,the total 3D morphology of a workpiece can be reconstructed with continuous multiframe contours that are adjacent.To improve the extraction speed of the centerline,a fast extraction method of stripe center based on timecontinuous frame information multiplexing is proposed in this paper,which is in view of the similarity between continuous frame images.First,the centerline coordinates of the first frame laser stripe are calculated using the adaptive gravitycenter extraction algorithm using stripe segmentation.Second,based on the centerline coordinate information of the previous frame,the rough location of stripe in the current frame image can be calculated quickly.Finally,the subpixel calculation on the centerline of the stripe is performed.According to the image similarity of timecontinuous frames,the method multiplexes the centerline coordinate information to reduce repeated calculation,which can improve the algorithm speed effectively.The experimental results show that the method can achieve the centerline calculation with a higher speed of up to 133 frame/s,which greatly improves the 3D scanning speed with linear structured light and can be applied to other 3D reconstructions of large workpieces.