16 research outputs found

    Real-World Blur Dataset for Learning and Benchmarking Deblurring Algorithms

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    Computational Photography, Deblurring, Low-level Vision, Datasets and EvaluationNumerous learning-based approaches to single image deblurring for camera and object motion blurs have recently been proposed. To generalize such approaches to real-world blurs, large datasets of real blurred images and their ground truth sharp images are essential. However, there are still no such datasets, thus all the existing approaches resort to synthetic ones, which leads to the failure of deblurring real-world images. In this work, we present a large-scale dataset of real-world blurred images and their corresponding sharp images captured in low-light environments for learning and benchmarking single image deblurring methods. To collect our dataset, we build an image acquisition system to simultaneously capture a geometrically aligned pair of blurred and sharp images, and develop a post-processing method to further align images geometrically and photometrically. We analyze the effect of our post-processing step, and the performance of existing learning-based deblurring methods. Our analysis shows that our dataset significantly improves deblurring quality for real-world low-light images.Y1. Introduction 1 2. Related Work 2 3. Image Acquisition System and Process 3 3.1 Image Acquisition System 3 3.2 Image Acquisition Process 4 4. Post-Processing 5 4.1 Downsampling & Denoising 6 4.2 Geometric Alignment 6 4.3 Photometric Alignment 8 5. Experiments 8 5.1 Analysis of RealBlur Dataset 9 5.2 Benchmark 12 6. Conclusion 19 7. Appendix 20 8. References 24 9. 요약문 28MasterdCollectio

    Estimates of M-Harmonic Conjugate Operator

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    We define the M-harmonic conjugate operator K and prove that for 1<p<∞, there is a constant Cp such that ∫S|Kf|pωdσ≤Cp∫S|f|pωdσ for all f∈Lp(ω) if and only if the nonnegative weight ω satisfies the Ap-condition. Also, we prove that if there is a constant Cp such that ∫S|Kf|pvdσ≤Cp∫S|f|pwdσ for all f∈Lp(w), then the pair of weights (v,w) satisfies the Ap-condition

    Estimates of weighted Hardy–Littlewood averages on the p-adic vector space

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    AbstractIn the p-adic vector space Qpn, we characterize those non-negative functions ψ defined on Zp*={w∈Qp:0<|w|p⩽1} for which the weighted Hardy–Littlewood average Uψ:f→∫Zp*f(t⋅)ψ(t)dt is bounded on Lr(Qpn) (1⩽r⩽∞), and on BMO(Qpn). Also, in each case, we find the corresponding operator norm ‖Uψ‖

    ExBluRF: Efficient Radiance Fields for Extreme Motion Blurred Images

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    We present ExBluRF, a novel view synthesis method for extreme motion blurred images based on efficient radiance fields optimization. Our approach consists of two main components: 6-DOF camera trajectory-based motion blur formulation and voxel-based radiance fields. From extremely blurred images, we optimize the sharp radiance fields by jointly estimating the camera trajectories that generate the blurry images. In training, multiple rays along the camera trajectory are accumulated to reconstruct single blurry color, which is equivalent to the physical motion blur operation. We minimize the photo-consistency loss on blurred image space and obtain the sharp radiance fields with camera trajectories that explain the blur of all images. The joint optimization on the blurred image space demands painfully increasing computation and resources proportional to the blur size. Our method solves this problem by replacing the MLP-based framework to low-dimensional 6-DOF camera poses and voxel-based radiance fields. Compared with the existing works, our approach restores much sharper 3D scenes from challenging motion blurred views with the order of 10 times less training time and GPU memory consumption.Comment: https://github.com/taekkii/ExBluRF/tree/mai

    Human Pose Estimation in Extremely Low-Light Conditions

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    We study human pose estimation in extremely low-light images. This task is challenging due to the difficulty of collecting real low-light images with accurate labels, and severely corrupted inputs that degrade prediction quality significantly. To address the first issue, we develop a dedicated camera system and build a new dataset of real low-light images with accurate pose labels. Thanks to our camera system, each low-light image in our dataset is coupled with an aligned well-lit image, which enables accurate pose labeling and is used as privileged information during training. We also propose a new model and a new training strategy that fully exploit the privileged information to learn representation insensitive to lighting conditions. Our method demonstrates outstanding performance on real extremely low light images, and extensive analyses validate that both of our model and dataset contribute to the success.Comment: Accepted to CVPR 202

    Estimates of <inline-formula> <graphic file="1029-242X-2010-435450-i1.gif"/></inline-formula>-Harmonic Conjugate Operator

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    We define the -harmonic conjugate operator and prove that for , there is a constant such that for all if and only if the nonnegative weight satisfies the -condition. Also, we prove that if there is a constant such that for all , then the pair of weights satisfies the -condition.</p

    Estimates of Marcinkiewicz Integrals with Bounded Homogeneous Kernels of Degree Zero

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    Iterative Filter Adaptive Network for Single Image Defocus Deblurring

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    We propose a novel end-to-end learning-based approach for single image defocus deblurring. The proposed approach is equipped with a novel Iterative Filter Adaptive Network (IFAN) that is specifically designed to handle spatially-varying and large defocus blur. For adaptively handling spatially-varying blur, IFAN predicts pixel-wise deblurring filters, which are applied to defocused features of an input image to generate deblurred features. For effectively managing large blur, IFAN models deblurring filters as stacks of small-sized separable filters. Predicted separable deblurring filters are applied to defocused features using a novel Iterative Adaptive Convolution (IAC) layer. We also propose a training scheme based on defocus disparity estimation and reblurring, which significantly boosts the deblurring quality. We demonstrate that our method achieves state-of-the-art performance both quantitatively and qualitatively on real-world images1

    Properties of the ℳ-Harmonic Conjugate Operator

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