Online Adaptation of Convolutional Neural Networks for Video Object Segmentation

TL;DR

This paper introduces OnAVOS, an online adaptive method for semi-supervised video object segmentation that updates the model during testing to handle appearance changes, achieving state-of-the-art results.

Contribution

The paper proposes OnAVOS, an online adaptive extension to OSVOS, incorporating confidence-based updates and objectness pretraining for improved segmentation.

Findings

Achieves 85.7% IoU on DAVIS dataset.

Online adaptation significantly improves segmentation accuracy.

Pretraining on objectness enhances model robustness.

Abstract

We tackle the task of semi-supervised video object segmentation, i.e. segmenting the pixels belonging to an object in the video using the ground truth pixel mask for the first frame. We build on the recently introduced one-shot video object segmentation (OSVOS) approach which uses a pretrained network and fine-tunes it on the first frame. While achieving impressive performance, at test time OSVOS uses the fine-tuned network in unchanged form and is not able to adapt to large changes in object appearance. To overcome this limitation, we propose Online Adaptive Video Object Segmentation (OnAVOS) which updates the network online using training examples selected based on the confidence of the network and the spatial configuration. Additionally, we add a pretraining step based on objectness, which is learned on PASCAL. Our experiments show that both extensions are highly effective and improve the state of the art on DAVIS to an intersection-over-union score of 85.7%.