Reconstructing a 3D hand from a single-view RGB image is challenging due to various hand configurations and depth ambiguity. To reliably reconstruct a 3D hand from a monocular image, most state-of-the-art methods heavily rely on 3D annotations at the training stage, but obtaining 3D annotations is expensive. To alleviate reliance on labeled training data, we propose S2HAND, a self-supervised 3D hand reconstruction network that can jointly estimate pose, shape, texture, and the camera viewpoint. Specifically, we obtain geometric cues from the input image through easily accessible 2D detected keypoints. To learn an accurate hand reconstruction model from these noisy geometric cues, we utilize the consistency between 2D and 3D representations and propose a set of novel losses to rationalize outputs of the neural network. For the first time, we demonstrate the feasibility of training an accurate 3D hand reconstruction network without relying on manual annotations. Our experiments show that the proposed method achieves comparable performance with recent fully-supervised methods while using fewer supervision data.

本文提出了一种利用自我监督的三维手部重建网络，通过利用易于提取的二维关键点从输入图像中获取几何线索，并通过一套新颖的损失函数推理出网络输出，以进行精确的手部重建。与使用手动标注数据训练的方法相比，我们的方法减少了对手动标注的依赖，并展示了在更少的监督数据下达到可比较的性能。

基于模型的自监督学习实现的3D手部重建