Unsupervised Disentanglement of Pose, Appearance and Background from Images and Videos
Authors: Aysegul Dundar, Kevin J Shih, Animesh Garg, Robert Pottorf, Andrew Tao, Bryan Catanzaro
Keywords: unsupervised landmark discovery
Abstract: Unsupervised landmark learning is the task of learning semantic keypoint-like
representations without the use of expensive keypoint-level annotations. A popular approach is to factorize an image into a pose and appearance data stream, then to reconstruct the image from the factorized components. The pose representation should capture a set of consistent and tightly localized landmarks in order to facilitate reconstruction of the input image. Ultimately, we wish for our learned landmarks to focus on the foreground object of interest. However, the reconstruction task of the entire image forces the model to allocate landmarks to model the background. This work explores the effects of factorizing the reconstruction task into separate foreground and background reconstructions, conditioning only the foreground reconstruction on the unsupervised landmarks. Our experiments demonstrate that the proposed factorization results in landmarks that are focused on the foreground object of interest. Furthermore, the rendered background quality is also improved, as the background rendering pipeline no longer requires the ill-suited landmarks to model its pose and appearance. We demonstrate this improvement in the context of the video-prediction.