Combining Internal and External Constraints for Unrolling Shutter in Videos

• URL: http://arxiv.org/abs/2207.11725v1
• Date: Sun, 24 Jul 2022 12:01:27 GMT
• Title: Combining Internal and External Constraints for Unrolling Shutter in Videos
• Authors: Eyal Naor and Itai Antebi and Shai Bagon and Michal Irani
• Abstract summary: We propose a space-time solution to the RS problem. We observe that a RS video and its corresponding GS video tend to share the exact same xt slices -- up to a known sub-frame temporal shift. This allows to constrain the GS output video using video-specific constraints imposed by the RS input video.
• Score: 10.900978946948095
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Videos obtained by rolling-shutter (RS) cameras result in spatially-distorted frames. These distortions become significant under fast camera/scene motions. Undoing effects of RS is sometimes addressed as a spatial problem, where objects need to be rectified/displaced in order to generate their correct global shutter (GS) frame. However, the cause of the RS effect is inherently temporal, not spatial. In this paper we propose a space-time solution to the RS problem. We observe that despite the severe differences between their xy frames, a RS video and its corresponding GS video tend to share the exact same xt slices -- up to a known sub-frame temporal shift. Moreover, they share the same distribution of small 2D xt-patches, despite the strong temporal aliasing within each video. This allows to constrain the GS output video using video-specific constraints imposed by the RS input video. Our algorithm is composed of 3 main components: (i) Dense temporal upsampling between consecutive RS frames using an off-the-shelf method, (which was trained on regular video sequences), from which we extract GS "proposals". (ii) Learning to correctly merge an ensemble of such GS "proposals" using a dedicated MergeNet. (iii) A video-specific zero-shot optimization which imposes the similarity of xt-patches between the GS output video and the RS input video. Our method obtains state-of-the-art results on benchmark datasets, both numerically and visually, despite being trained on a small synthetic RS/GS dataset. Moreover, it generalizes well to new complex RS videos with motion types outside the distribution of the training set (e.g., complex non-rigid motions) -- videos which competing methods trained on much more data cannot handle well. We attribute these generalization capabilities to the combination of external and internal constraints.

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