Visual Object Networks: Image Generation with Disentangled 3D Representation

Jun-Yan Zhu       Zhoutong Zhang       Chengkai Zhang       Jiajun Wu
Antonio Torralba       Joshua B. Tenenbaum       William T. Freeman

MIT CSAIL         Google Research

In NeruIPS 2018

Paper | Code




Abstract

Recent progress in deep generative models has led to tremendous breakthroughs in image generation. However, while existing models can synthesize photorealistic images, they lack an understanding of our underlying 3D world. We present a new generative model, Visual Object Networks (VON), synthesizing natural images of objects with a disentangled 3D representation. Inspired by classic graphics rendering pipelines, we unravel our image formation process into three conditionally independent factors---shape, viewpoint, and texture---and present an end-to-end adversarial learning framework that jointly models 3D shapes and 2D images. Our model first learns to synthesize 3D shapes that are indistinguishable from real shapes. It then renders the object's 2.5D sketches (i.e., silhouette and depth map) from its shape under a sampled viewpoint. Finally, it learns to add realistic texture to these 2.5D sketches to generate natural images. The VON not only generates images that are more realistic than state-of-the-art 2D image synthesis methods, but also enables many 3D operations such as changing the viewpoint of a generated image, editing of shape and texture, linear interpolation in texture and shape space, and transferring appearance across different objects and viewpoints.

paper thumbnail

Paper

NeurIPS, 2018

Citation

Jun-Yan Zhu, Zhoutong Zhang, Chengkai Zhang, Jiajun Wu, Antonio Torralba, Joshua B. Tenenbaum, and William T. Freeman. "Visual Object Networks: Image Generation withDisentangled 3D Representation", in Neural Information Processing Systems (NeurIPS), 2018. Bibtex

Code: PyTorch

Comparisons between 2D GANs vs. VON

(a) Typical examples produced by a recent GAN model [Gulrajani et al., 2017]. (b) Our model produces three outputs: a 3D shape, its 2.5D projection given a viewpoint, and a final image with realistic texture. (c) Given this disentangled 3D representation, our method allows several 3D applications including changing viewpoint and editing shape or texture independently. Please see our code and website for more details.

 

Below we show more samples from DCGAN [Radford et al., 2016], LSGAN [Mao et al., 2017], WGAN-GP [Gulrajani et al., 2017], and our VON. For our method, we show both 3D shapes and 2D images. The learned 3D prior helps our model produce better samples.

 

3D Object Manipulations

Our Visual Object Networks (VON) allow several 3D applications such as (left) changing the viewpoint, texture, or shape independently, and (right) interpolating between two objects in shape space, texture space, or both.

 

Texture Transfer across Objects and Viewpoints

VON can transfer the texture of a real image to different shapes and viewpoints.

 


Poster

NeurIPS 2018


Acknowledgement

This work is supported by NSF #1231216, NSF #1524817, ONR MURI N00014-16-1-2007, Toyota Research Institute, Shell, and Facebook. We thank Xiuming Zhang, Richard Zhang, David Bau, and Zhuang Liu for valuable discussions.