Video inpainting, which aims at filling in missing regions of a video, remains challenging due to the difficulty of preserving the precise spatial and temporal coherence of video contents. In this work we propose a novel flow-guided video inpainting approach. Rather than filling in the RGB pixels of each frame directly, we consider video inpainting as a pixel propagation problem. We first synthesize a spatially and temporally coherent optical flow field across video frames using a newly designed Deep Flow Completion network. Then the synthesized flow field is used to guide the propagation of pixels to fill up the missing regions in the video. Specifically, the Deep Flow Completion network follows a coarse-to-fine refinement to complete the flow fields, while their quality is further improved by hard flow example mining. Following the guide of the completed flow, the missing video regions can be filled up precisely. Our method is evaluated on DAVIS and YouTube-VOS datasets qualitatively and quantitatively, achieving the state-of-the-art performance in terms of inpainting quality and speed.


Our framework contains two steps, the first step is to complete the missing flow while the second step is to propagate pixels with the guidance of completed flow fields. In the first step, a Deep Flow Completion Network (DFC-Net) is proposed for coarse-to-fine flow completion. DFC-Net consists of three similar subnetworks named as DFC-S. The first subnetwork estimates the flow in a relatively coarse scale and feeds them into the second and third subnetwork for further refinement. In the second step, after the flow is obtained, most of the missing regions can be filled up by pixels in known regions through a flow-guided propagation from different frames. A conventional image inpainting network is finally employed to complete the remaining regions that are not seen in the entire video. Thanks to the high-quality estimated flow in the first step, we can easily propagate these image inpainting results to the entire video sequence.


Results of our flow-guided video inpainting approach. For each input sequence (odd row), we show representative frames with mask of missing region overlay. We show the inpainting results in even rows. (Best viewed with zoom-in.)

Comparision with Huang et al.




 author = {Xu, Rui and Li, Xiaoxiao and Zhou, Bolei and Loy, Chen Change},
 title = {Deep Flow-Guided Video Inpainting},
 journal = {arXiv preprint},
 year = {2019}