arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.05770cs.CV
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用于多个3D人体姿势假设的弱监督生成网络

Weakly Supervised Generative Network for Multiple 3D Human Pose Hypotheses

National University of Singapore(新加坡国立大学)

Chen Li, Gim Hee Lee

摘要:

由于缺失深度的固有模糊性,从单个图像估计3D人体姿势是逆问题。以前的几个工作解决了反问题,通过生成多个假设。然而,这些作品受到强烈的监督,需要地面真实的2D到3D对应关系,这可能很难获得。在本文中,我们提出了一个弱监督的深度生成网络来解决逆问题,并避免了对地面真实2D到3D对应的需求。为此,我们设计我们的网络来模拟一个建议分布,我们使用它来近似未知的多模态目标后验分布。我们通过最小化建议和目标分布之间的KL分歧来实现近似,这会导致2D重投影误差和可以弱监督的先验损失项。此外,我们使用均值漂移算法确定最可能的解决方案作为样本的条件模式。我们在三个基准数据集上评估了我们的方法- Human3.6M,MPII和MPI-INF-3DHP。实验结果表明,我们的方法是能够产生多个可行的假设,并实现了国家的最先进的结果相比,现有的弱监督的方法。我们的源代码可以在项目网站上找到。

英文摘要:

3D human pose estimation from a single image is an inverse problem due to the inherent ambiguity of the missing depth. Several previous works addressed the inverse problem by generating multiple hypotheses. However, these works are strongly supervised and require ground truth 2D-to-3D correspondences which can be difficult to obtain. In this paper, we propose a weakly supervised deep generative network to address the inverse problem and circumvent the need for ground truth 2D-to-3D correspondences. To this end, we design our network to model a proposal distribution which we use to approximate the unknown multi-modal target posterior distribution. We achieve the approximation by minimizing the KL divergence between the proposal and target distributions, and this leads to a 2D reprojection error and a prior loss term that can be weakly supervised. Furthermore, we determine the most probable solution as the conditional mode of the samples using the mean-shift algorithm. We evaluate our method on three benchmark datasets -- Human3.6M, MPII and MPI-INF-3DHP. Experimental results show that our approach is capable of generating multiple feasible hypotheses and achieves state-of-the-art results compared to existing weakly supervised approaches. Our source code is available at the project website.

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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