Masked Label Learning for Optical Flow Regression
Guorun Yang, Zhidong Deng, Shiyao Wang, Zeping Li · 2018
Optical flow estimation is a challenging task in computer vision. Recent methods formulate such task as a supervised-learning problem. But it often suffers from limited realistic ground truth. In this paper, a compact network, embedded with cost volume, residual encoder and deconvolutional decoder, is presented to regress optical flow in an end- to-end manner. To overcome the lack of flow labels, we propose a novel data-driven strategy called masked label learning, where a large amount of masked labels are generated from the FlowNet 2.0 model and filtered by warping calibration for model training. We also present an extended-Huber loss to handle large displacements. With pretraining on massive masked flow data, followed by finetuning on a small number of sparse labels, our method achieves state-of-the-art accuracy on KITTI flow benchmark.