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arXiv 1707.01313cs.CV
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基于真实照片的基准去噪算法

Benchmarking Denoising Algorithms with Real Photographs

Department of Computer Science, TU Darmstadt(达姆施塔特工业大学计算机科学系)

Tobias Plötz, Stefan Roth

摘要:

由于缺乏真实的地面数据,传统上对合成i.i.d.损坏的图像进行图像去噪技术评估。高斯噪声我们的目标是通过开发一种在真实照片上对去噪技术进行基准测试的方法来消除这种不切实际的设置。我们使用不同的ISO值和适当调整的曝光时间拍摄图像对,其中几乎无噪声的低ISO图像作为参考。为了获得地面实况,需要仔细的后处理。我们校正空间未对准,通过基于新型异方差Tobit回归模型的线性强度变换来处理曝光参数中的不准确性,并去除残留的低频偏差,例如,轻微的照明变化。然后,我们捕获了一个新的基准数据集,达姆施塔特噪声数据集(DND),与不同传感器尺寸的消费相机。一个有趣的发现是,最近各种在合成噪声上表现良好的技术在具有真实噪声的照片上明显优于BM 3D。我们的基准描绘了现实的评估方案,强烈偏离那些常用的科学文献。

英文摘要:

Lacking realistic ground truth data, image denoising techniques are traditionally evaluated on images corrupted by synthesized i.i.d. Gaussian noise. We aim to obviate this unrealistic setting by developing a methodology for benchmarking denoising techniques on real photographs. We capture pairs of images with different ISO values and appropriately adjusted exposure times, where the nearly noise-free low-ISO image serves as reference. To derive the ground truth, careful post-processing is needed. We correct spatial misalignment, cope with inaccuracies in the exposure parameters through a linear intensity transform based on a novel heteroscedastic Tobit regression model, and remove residual low-frequency bias that stems, e.g., from minor illumination changes. We then capture a novel benchmark dataset, the Darmstadt Noise Dataset (DND), with consumer cameras of differing sensor sizes. One interesting finding is that various recent techniques that perform well on synthetic noise are clearly outperformed by BM3D on photographs with real noise. Our benchmark delineates realistic evaluation scenarios that deviate strongly from those commonly used in the scientific literature.

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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