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arXiv 2204.09679cs.CVcs.LGeess.IV
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FS-NCSR:通过频率分离和噪声调节归一化流增加超分辨率空间的多样性

FS-NCSR: Increasing Diversity of the Super-Resolution Space via Frequency Separation and Noise-Conditioned Normalizing Flow

Seoul National University(首尔国立大学);Deepest;MINDsLab Inc.(MINDsLab公司)

Ki-Ung Song, Dongseok Shim, Kang-wook Kim, Jae-young Lee, Younggeun Kim

摘要:

超分辨率存在一个固有的不适定问题,即单个低分辨率(LR)图像可能来自多个高分辨率(HR)图像。基于流的算法的最新研究通过学习超分辨率空间和预测不同的HR输出来解决这种不适定性。不幸的是,超分辨率输出的多样性仍然不能令人满意,并且来自基于流的模型的输出通常遭受不期望的伪影,这导致低质量的输出。在本文中,我们提出了FS-NCSR产生不同的和高品质的超分辨率输出使用频率分离和噪声调节相比,现有的基于流的方法。由于图像的清晰度和高质量细节依赖于其高频信息,因此FS-NCSR仅估计高分辨率输出的高频信息,而没有冗余的低频分量。通过这一点,FS-NCSR显着提高了多样性得分,而没有显着的图像质量下降相比,NCSR,前NTIRE 2021挑战的赢家。

英文摘要:

Super-resolution suffers from an innate ill-posed problem that a single low-resolution (LR) image can be from multiple high-resolution (HR) images. Recent studies on the flow-based algorithm solve this ill-posedness by learning the super-resolution space and predicting diverse HR outputs. Unfortunately, the diversity of the super-resolution outputs is still unsatisfactory, and the outputs from the flow-based model usually suffer from undesired artifacts which causes low-quality outputs. In this paper, we propose FS-NCSR which produces diverse and high-quality super-resolution outputs using frequency separation and noise conditioning compared to the existing flow-based approaches. As the sharpness and high-quality detail of the image rely on its high-frequency information, FS-NCSR only estimates the high-frequency information of the high-resolution outputs without redundant low-frequency components. Through this, FS-NCSR significantly improves the diversity score without significant image quality degradation compared to the NCSR, the winner of the previous NTIRE 2021 challenge.

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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