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Outliers in point clouds affect the performance of surface reconstruction directly. Most of outlier removal methods just remove
those outliers far away from the real surface and are only applied to handle watertight surface. In this paper, a two-step
outlier removal procedure is proposed to filter the point clouds acquired from the gray code and line-shifting technique.
The first step is to remove the outliers far away from the real surface. Some feature points are extracted from the point
clouds to construct an initial surface. The points with distances to the initial surface greater than a given threshold are
removed as distant outliers. The retained points are linked into lines in each structured light sheet using their Voronoi
diagrams. Some of lines which are very close to the real surface are removed as near outliers in the second step. The experimental
results show that the proposed method is very effective in removing outliers for surface reconstruction.
Foundation item: the National Natural Science Foundation of China (No. 30470488) 相似文献
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为分析车辆荷载与水耦合作用下的路面板底脱空形态发展机理,建立混凝土路面-水流固耦合计算模型,对车辆行驶速度、轴载等因素对动水压力的影响进行分析,并进一步对尖端应力强度因子进行计算。结果表明:车辆驶向脱空区时,脱空区内水产生正压力,并沿着出口方向呈三次多项式减小关系;车辆驶离脱空区时,产生负压力,并沿着出口方向呈三次多项式增加关系。动水压力大小与车辆行驶速度呈二次方增加关系,与轴载呈线性增加关系。在车辆荷载与滞留水耦合作用下,当行驶速度由60km/h增加到120km/h时,应力强度因子KⅠ增加了79.2%,KⅡ增加了54.83%,KⅢ增加了1.23%,表明车辆行驶速度的提升明显加剧了混凝土路面板底脱空形态的发展,且其发展是由KⅠ、KⅡ、KⅢ综合决定的。在雨水丰富或排水不畅地区,采取交通管制措施,降低车辆行驶速度和轴载,并及时采取注浆修补措施,可有效减缓动水压力引起的路面结构破坏。 相似文献
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杨荣 《铁道标准设计通讯》2008,(10)
结合十字垭隧道工程实例,介绍石膏硫酸盐等的膨胀性侵蚀对工程的危害,病害原因分析,病害结论。重点介绍侵蚀的症状表现,石膏及硫酸盐侵蚀的形成机理;针对本工程而采取的治理方案,以及对今后设计、施工的借鉴意义。 相似文献
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