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arXiv 2210.03040cs.CV
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滚动快门反转:将滚动快门图像转换为高帧率全局快门视频

Rolling Shutter Inversion: Bring Rolling Shutter Images to High Framerate Global Shutter Video

Northwestern Polytechnical University(西北工业大学);the Australian National University(澳大利亚国立大学)

Bin Fan, Yuchao Dai, Hongdong Li

摘要:

单个卷帘快门(RS)图像可以被视为在曝光持续时间内由(虚拟)移动的GS相机捕获的全局快门(GS)图像序列的逐行组合。虽然RS相机被广泛使用,但RS效应会导致明显的图像失真,特别是在存在快速相机运动的情况下,阻碍下游计算机视觉任务。在本文中,我们提出了反转的RS图像捕获机制,即,从两个时间连续的RS帧恢复连续的高帧率GS视频。我们称这个任务为RS时间超分辨率(RSSR)问题。RSSR是一项非常具有挑战性的任务,据我们所知,迄今为止还没有实际的解决方案。本文提出了一种新的基于深度学习的解决方案。通过利用RS成像过程的多视图几何关系,我们的基于学习的框架成功地实现了高帧率GS生成。具体来说,可以确定三个新的贡献:(i)新的公式,双向RS无失真流下的恒定速度以及恒定加速度运动模型。(ii)一个简单的线性缩放操作,它桥接了RS非失真流和规则光流。(iii)在对应于不同扫描线的不同RS非失真流之间的一种新的相互转换方案。我们的方法还利用了深度学习框架内的潜在时空几何关系,其中除了必要的中间扫描线GS图像之外,不需要额外的监督。在这些贡献的基础上,我们代表了第一个滚动快门时间超分辨率深度网络,它能够从两个RS帧中恢复高帧率的GS视频。大量的实验结果表明,我们提出的方法可以产生高质量的GS图像序列与丰富的细节,优于国家的最先进的方法。

英文摘要:

A single rolling-shutter (RS) image may be viewed as a row-wise combination of a sequence of global-shutter (GS) images captured by a (virtual) moving GS camera within the exposure duration. Although RS cameras are widely used, the RS effect causes obvious image distortion especially in the presence of fast camera motion, hindering downstream computer vision tasks. In this paper, we propose to invert the RS image capture mechanism, i.e., recovering a continuous high framerate GS video from two time-consecutive RS frames. We call this task the RS temporal super-resolution (RSSR) problem. The RSSR is a very challenging task, and to our knowledge, no practical solution exists to date. This paper presents a novel deep-learning based solution. By leveraging the multi-view geometry relationship of the RS imaging process, our learning-based framework successfully achieves high framerate GS generation. Specifically, three novel contributions can be identified: (i) novel formulations for bidirectional RS undistortion flows under constant velocity as well as constant acceleration motion model. (ii) a simple linear scaling operation, which bridges the RS undistortion flow and regular optical flow. (iii) a new mutual conversion scheme between varying RS undistortion flows that correspond to different scanlines. Our method also exploits the underlying spatial-temporal geometric relationships within a deep learning framework, where no additional supervision is required beyond the necessary middle-scanline GS image. Building upon these contributions, we represent the very first rolling-shutter temporal super-resolution deep-network that is able to recover high framerate GS videos from just two RS frames. Extensive experimental results on both synthetic and real data show that our proposed method can produce high-quality GS image sequences with rich details, outperforming the state-of-the-art methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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