In the line structured light measuring system, the accuracy of the process of laser stripe directly affects the measurement results. Therefore, the extraction algorithm for the laser stripe, especially the surface wit...In the line structured light measuring system, the accuracy of the process of laser stripe directly affects the measurement results. Therefore, the extraction algorithm for the laser stripe, especially the surface with high reflection and high curvature, is very important. The imaging principle of line structured light, the light intensity distribution law of laser stripe and the extraction algorithm have been studied, and a stripe profile extraction method based on real light intensity distribution has been proposed. In this algorithm, fast region of interest extraction, stripe width estimation, and adaptive filtering on the striped image are performed. Then the energy center of the stripe at the sub-pixel level is extracted. Finally, the low-quality center points are eliminated, and the context information is used to recover the missing central points. Simulated images generated based on the imaging principle of line structured light and real experimental images were used to evaluate the accuracy and repeatability of the proposed method. The results show that the method behaves excellently at the edges of high-curvature stripes;the maximum error is only 1.6 pixels, which is 1/10 of the classic Steger algorithm;the experiment repeatability is only 8.8 μm, which is 2.7 times that of the Steger method. Therefore, the proposed method improves the accuracy of object contour extraction, and it is especially suitable for contour detection of objects with high curvature.展开更多
提出一种基于骨架邻近像素匹配的线结构光条中心提取方法,分别在图像预处理阶段和光条中心提取阶段对传统方法进行改进.在图像预处理阶段,将马尔可夫随机场理论应用于二值图像去噪中,同时提出了一种基于连通域面积特性的ROI(region of i...提出一种基于骨架邻近像素匹配的线结构光条中心提取方法,分别在图像预处理阶段和光条中心提取阶段对传统方法进行改进.在图像预处理阶段,将马尔可夫随机场理论应用于二值图像去噪中,同时提出了一种基于连通域面积特性的ROI(region of interest)提取方法.在光条中心提取阶段,首先提出了一种光条骨架剪枝算法,对细化ROI得到的光条骨架进行剪枝、平滑,之后综合考虑光条图像的几何特性和灰度分布特性,基于邻近分析对ROI内各像素进行划分,继而求取出灰度重心,最后经Savitzky-Golay滤波后实现光条中心提取.实验结果表明,所提方法对不同类型光条的提取适用性强,相较于Steger法精度更高,且速度在其基础上提高了约6.98倍.展开更多
基金the National Natural Science Foundation of China(Nos.51975374 and 61927822)。
文摘In the line structured light measuring system, the accuracy of the process of laser stripe directly affects the measurement results. Therefore, the extraction algorithm for the laser stripe, especially the surface with high reflection and high curvature, is very important. The imaging principle of line structured light, the light intensity distribution law of laser stripe and the extraction algorithm have been studied, and a stripe profile extraction method based on real light intensity distribution has been proposed. In this algorithm, fast region of interest extraction, stripe width estimation, and adaptive filtering on the striped image are performed. Then the energy center of the stripe at the sub-pixel level is extracted. Finally, the low-quality center points are eliminated, and the context information is used to recover the missing central points. Simulated images generated based on the imaging principle of line structured light and real experimental images were used to evaluate the accuracy and repeatability of the proposed method. The results show that the method behaves excellently at the edges of high-curvature stripes;the maximum error is only 1.6 pixels, which is 1/10 of the classic Steger algorithm;the experiment repeatability is only 8.8 μm, which is 2.7 times that of the Steger method. Therefore, the proposed method improves the accuracy of object contour extraction, and it is especially suitable for contour detection of objects with high curvature.
文摘提出一种基于骨架邻近像素匹配的线结构光条中心提取方法,分别在图像预处理阶段和光条中心提取阶段对传统方法进行改进.在图像预处理阶段,将马尔可夫随机场理论应用于二值图像去噪中,同时提出了一种基于连通域面积特性的ROI(region of interest)提取方法.在光条中心提取阶段,首先提出了一种光条骨架剪枝算法,对细化ROI得到的光条骨架进行剪枝、平滑,之后综合考虑光条图像的几何特性和灰度分布特性,基于邻近分析对ROI内各像素进行划分,继而求取出灰度重心,最后经Savitzky-Golay滤波后实现光条中心提取.实验结果表明,所提方法对不同类型光条的提取适用性强,相较于Steger法精度更高,且速度在其基础上提高了约6.98倍.