论文标题

“单独教导独立零件”(tipsy-gan):提高无监督的对抗2D至3D姿势估计的准确性和稳定性

"Teaching Independent Parts Separately" (TIPSy-GAN) : Improving Accuracy and Stability in Unsupervised Adversarial 2D to 3D Pose Estimation

论文作者

Hardy, Peter, Dasmahapatra, Srinandan, Kim, Hansung

论文摘要

我们提出了Tipsy-Gan,这是一种新的方法,可以提高无监督的对抗2d至3D人类姿势估计的准确性和稳定性。在我们的工作中,我们证明了人运动骨骼不应被假定为单一的空间相互依存的结构。实际上,我们认为,当训练期间提供完整的2D姿势时,存在一种固有的偏见,在其中,关键点的3D坐标在空间上依赖于所有其他关键点的2D坐标。为了研究我们的假设,我们遵循以前的对抗方法,但在运动骨架,躯干和腿的空间独立部分上训练两个发电机。我们发现,提高自抗性周期是降低评估误差的关键,因此在训练过程中引入了新的一致性约束。通过这些发电机的知识蒸馏产生一个尖端模型,该模型可以预测整个2D姿势的3D尺寸,并改善结果。此外,我们在先前的工作中解决了一个未解决的问题,即在一个真正无监督的情况下训练了多长时间。我们表明,对于两个独立的发电机,对手训练的稳定性比倒塌的独奏发电机的稳定性提高了。与人为360万数据集中的基线独奏器相比,Tipsy将平均误差降低了17 \%。 Tipsy在其他无监督的方法上进行了改进,同时在对人类360万和MPI-INF-INF-3DHP数据集的评估过程中也强烈反对受监督和弱监督的方法。

We present TIPSy-GAN, a new approach to improve the accuracy and stability in unsupervised adversarial 2D to 3D human pose estimation. In our work we demonstrate that the human kinematic skeleton should not be assumed as a single spatially codependent structure; in fact, we posit when a full 2D pose is provided during training, there is an inherent bias learned where the 3D coordinate of a keypoint is spatially codependent on the 2D coordinates of all other keypoints. To investigate our hypothesis we follow previous adversarial approaches but train two generators on spatially independent parts of the kinematic skeleton, the torso and the legs. We find that improving the self-consistency cycle is key to lowering the evaluation error and therefore introduce new consistency constraints during training. A TIPSy model is produced via knowledge distillation from these generators which can predict the 3D ordinates for the entire 2D pose with improved results. Furthermore, we address an unanswered question in prior work of how long to train in a truly unsupervised scenario. We show that for two independent generators training adversarially has improved stability than that of a solo generator which collapses. TIPSy decreases the average error by 17\% when compared to that of a baseline solo generator on the Human3.6M dataset. TIPSy improves upon other unsupervised approaches while also performing strongly against supervised and weakly-supervised approaches during evaluation on both the Human3.6M and MPI-INF-3DHP datasets.

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