clear points
OmniMotion jointly tracks all points in a video across all frames, even through occlusions.
We present a new test-time optimization method for estimating dense and long-range motion from a video sequence. Prior optical flow or particle video tracking algorithms typically operate within limited temporal windows, struggling to track through occlusions and maintain global consistency of estimated motion trajectories. We propose a complete and globally consistent motion representation, dubbed OmniMotion, that allows for accurate, full-length motion estimation of every pixel in a video. OmniMotion represents a video using a quasi-3D canonical volume and performs pixel-wise tracking via bijections between local and canonical space. This representation allows us to ensure global consistency, track through occlusions, and model any combination of camera and object motion. Extensive evaluations on the TAP-Vid benchmark and real-world footage show that our approach outperforms prior state-of-the-art methods by a large margin both quantitatively and qualitatively.
Trail visualization
Point visualization. Points detected as occluded are marked as "+"
Use our interactive demo to inspect the correspondences generated by our method. Simply click on any location in the query frame (left), and observe its corresponding location in the target frame (right). Use the slider to switch to a different target frame, and press the 'clear points' button to remove all points. Points that are identified as occluded are displayed as crosses '+' instead of dots '●'. Note that this demo showcases correspondences for a single query frame, but our representation captures all correspondences from any frame to any other frame in a video.
Since our method optimizes an underlying quasi-3D representation, we can extract a pseudo-depth visualization showing the relative ordering of different parts of the scene. Blue: near, Red: far.
Like many motion estimation methods, our method struggles with rapid and highly non-rigid motion as well as thin structures. In these scenarios, pairwise correspondence methods can fail to provide enough reliable correspondences for our method to compute accurate global motion.
@inproceedings{wang2023omnimotion,
title = {Tracking Everything Everywhere All at Once},
author = {Wang, Qianqian and Chang, Yen-Yu and Cai, Ruojin and Li, Zhengqi and Hariharan, Bharath and Holynski, Aleksander and Snavely, Noah},
booktitle = {International Conference on Computer Vision},
year = {2023}
}