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arXiv 2202.11292cs.CV
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无监督点云配准的可靠内点估计

Reliable Inlier Evaluation for Unsupervised Point Cloud Registration

Nanjing University of Science and Technology(南京理工大学)

Yaqi Shen, Le Hui, Haobo Jiang, Jin Xie, Jian Yang

摘要:

无监督点云配准算法在部分重叠问题中,由于缺乏有效的内点评价,配准精度往往不高。提出了一种基于邻域一致性的可靠内点评价方法,用于点云配准。期望捕获源邻域和对应的伪目标邻域之间的区别性几何差异以用于有效的内点区分。具体来说,我们的模型包括一个匹配映射细化模块和一个内点评估模块。在匹配图细化模块中,我们通过将相邻点的匹配得分整合到匹配图中来改进逐点匹配图估计,聚合的相邻点信息可能有助于区分图的构建,从而可以为生成伪目标点云提供高质量的对应关系。基于观察到离群点在其源邻域和对应的伪目标邻域之间具有显著的结构方面的差异,而对于内点的这种差异很小,内点评估模块利用这种差异来对每个估计的对应性的内点置信度进行评分。特别是,我们构建了一个有效的图形表示捕捉这种几何差异的邻居。最后,利用学习到的对应关系和相应的内点置信度,我们使用加权SVD算法进行变换估计。在无监督的情况下,我们利用基于Huber函数的全局对齐损失,局部邻域一致性损失和空间一致性损失进行模型优化。在大量数据集上的实验结果表明,我们的无监督点云配准方法可以产生相当的性能。

英文摘要:

Unsupervised point cloud registration algorithm usually suffers from the unsatisfied registration precision in the partially overlapping problem due to the lack of effective inlier evaluation. In this paper, we propose a neighborhood consensus based reliable inlier evaluation method for robust unsupervised point cloud registration. It is expected to capture the discriminative geometric difference between the source neighborhood and the corresponding pseudo target neighborhood for effective inlier distinction. Specifically, our model consists of a matching map refinement module and an inlier evaluation module. In our matching map refinement module, we improve the point-wise matching map estimation by integrating the matching scores of neighbors into it. The aggregated neighborhood information potentially facilitates the discriminative map construction so that high-quality correspondences can be provided for generating the pseudo target point cloud. Based on the observation that the outlier has the significant structure-wise difference between its source neighborhood and corresponding pseudo target neighborhood while this difference for inlier is small, the inlier evaluation module exploits this difference to score the inlier confidence for each estimated correspondence. In particular, we construct an effective graph representation for capturing this geometric difference between the neighborhoods. Finally, with the learned correspondences and the corresponding inlier confidence, we use the weighted SVD algorithm for transformation estimation. Under the unsupervised setting, we exploit the Huber function based global alignment loss, the local neighborhood consensus loss, and spatial consistency loss for model optimization. The experimental results on extensive datasets demonstrate that our unsupervised point cloud registration method can yield comparable performance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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