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arXiv 2102.01579cs.CVcs.AI
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利用原始图像实现真实场景的超分辨率

Exploiting Raw Images for Real-Scene Super-Resolution

Carnegie Mellon University(卡内基梅隆大学);SenseTime Research(商汤科技研究院);University of California, Merced(加州大学默塞德分校)

Xiangyu Xu, Yongrui Ma, Wenxiu Sun, Ming-Hsuan Yang

摘要:

超分辨率是计算机视觉中的一个基本问题,其目的是克服相机传感器的空间限制。虽然在单图像超分辨率方面取得了重大进展,但大多数算法仅在合成数据上表现良好,这限制了它们在实际场景中的应用。本文研究了真实场景下单幅图像的超分辨率问题,以弥补合成数据与真实采集图像之间的差距。针对现有超分辨率算法存在的两个问题:缺乏真实感的训练数据和对摄像机视觉信息利用不足。为了解决第一个问题,我们提出了一种方法来产生更逼真的训练数据通过模仿数码相机的成像过程。对于第二个问题,我们开发了一个双分支卷积神经网络,利用原始图像中记录的辐射信息。此外,我们提出了一个更好的图像复原,以及一个基于学习的指导过滤器网络有效的颜色校正密集通道注意块。我们的模型能够推广到不同的相机,而无需刻意训练来自特定相机类型的图像。实验结果表明,该算法能较好地恢复真实场景中的细节和结构,实现了高质量的单幅图像超分辨率。

英文摘要:

Super-resolution is a fundamental problem in computer vision which aims to overcome the spatial limitation of camera sensors. While significant progress has been made in single image super-resolution, most algorithms only perform well on synthetic data, which limits their applications in real scenarios. In this paper, we study the problem of real-scene single image super-resolution to bridge the gap between synthetic data and real captured images. We focus on two issues of existing super-resolution algorithms: lack of realistic training data and insufficient utilization of visual information obtained from cameras. To address the first issue, we propose a method to generate more realistic training data by mimicking the imaging process of digital cameras. For the second issue, we develop a two-branch convolutional neural network to exploit the radiance information originally-recorded in raw images. In addition, we propose a dense channel-attention block for better image restoration as well as a learning-based guided filter network for effective color correction. Our model is able to generalize to different cameras without deliberately training on images from specific camera types. Extensive experiments demonstrate that the proposed algorithm can recover fine details and clear structures, and achieve high-quality results for single image super-resolution in real scenes.

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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