Supervised 3D reconstruction has witnessed a significant progress through the use of deep neural networks. However, this increase in performance requires large scale annotations of 2D/3D data. In this paper, we explore inexpensive 2D supervision as an alternative for expensive 3D CAD annotation. Specifically, we use foreground masks as weak supervision through a raytrace pooling layer that enables perspective projection and backpropagation. Additionally, since the 3D reconstruction from masks is an ill posed problem, we propose to constrain the 3D reconstruction to the manifold of unlabeled realistic 3D shapes that match mask observations. We demonstrate that learning a log-barrier solution to this constrained optimization problem resembles the GAN objective, enabling the use of existing tools for training GANs. We evaluate and analyze the manifold constrained reconstruction on various datasets for single and multi-view reconstruction of both synthetic and real images.
Gwak et al. REF explored inexpensive 2D supervision as an alternative for expensive 3D CAD annotation, used foreground masks as weak supervision through a ray trace pooling layer that enables perspective projection and backpropagation.
Weakly Supervised 3D Reconstruction with Adversarial Constraint
2017 International Conference on 3D Vision (3DV)
2017 International Conference on 3D Vision (3DV)
Computer Science