Unsupervised Learning of Category-Level 3D Pose from Object-Centric Videos
Authors: Leonhard Sommer, Artur Jesslen, Eddy Ilg, Adam Kortylewski

Category-level 3D pose estimation is a fundamentally important problem in computer vision and robotics e.g. for embodied agents or to train 3D generative models. However so far methods that estimate the category-level object pose require either large amounts of human annotations CAD models or input from RGB-D sensors. In contrast we tackle the problem of learning to estimate the category-level 3D pose only from casually taken object-centric videos without human supervision. We propose a two-step pipeline: First we introduce a multi-view alignment procedure that determines canonical camera poses across videos with a novel and robust cyclic distance formulation for geometric and appearance matching using reconstructed coarse meshes and DINOv2 features. In a second step the canonical poses and reconstructed meshes enable us to train a model for 3D pose estimation from a single image. In particular our model learns to estimate dense correspondences between images and a prototypical 3D template by predicting for each pixel in a 2D image a feature vector of the corresponding vertex in the template mesh. We demonstrate that our method outperforms all baselines at the unsupervised alignment of object-centric videos by a large margin and provides faithful and robust predictions in-the-wild on the Pascal3D+ and ObjectNet3D datasets.