Publications
โ๏ธ represents corresponding author.
2023
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Spiking Sparse Recovery with Non-convex PenaltiesZhang Xiang, Yu Lei โ๏ธ, Zheng Gang, and Eldar YoninaIEEE Transactions on Signal Processing, 2023
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Dynamic Coarse-To-Fine Learning for Oriented Tiny Object DetectionXu Chang, Ding Jian, Wang Jinwang, Yang Wen, Yu Huai, Yu Lei โ๏ธ, and Xia Gui-SongIn CVPR, 2023
2022
2021
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Image super-resolution by learning weighted convolutional sparse codingHe Jingwei, Yu Lei โ๏ธ, Liu Zhou, and Yang WenSignal, Image and Video Processing, 2021
2020
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Distributed compressive sensing via LSTM-Aided sparse Bayesian learningZhang Haijian, Zhang Wusheng, Yu Lei โ๏ธ, and Bi GuoanSignal Processing, 2020
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Robust motion compensation for event cameras with smooth constraintXu Jie, Jiang Meng, Yu Lei โ๏ธ, Yang Wen, and Wang WenweiIEEE Transactions on Computational Imaging, 2020
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Matching Neuromorphic Events and Color Images via Adversarial LearningXu Fang, Lin Shijie, Yang Wen, Yu Lei, Dai Dengxin, and Xia Gui-songarXiv preprint arXiv:2003.00636, 2020
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Robust Intensity Image Reconstruciton Based On Event CamerasJiang Meng, Liu Zhou, Wang Bishan, Yu Lei, and Yang WenIn 2020 IEEE International Conference on Image Processing (ICIP), 2020
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Event-based high frame-rate video reconstruction with a novel cycle-event networkSu Binyi, Yu Lei โ๏ธ, and Yang WenIn 2020 IEEE International Conference on Image Processing (ICIP), 2020
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Implicit Euler ODE networks for single-image dehazingShen Jiawei, Li Zhuoyan, Yu Lei โ๏ธ, Xia Gui-Song, and Yang WenIn Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops, 2020
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Facial Feature Embedded CycleGAN for VIS-NIR TranslationWang Huijiao, Zhang Haijian, Yu Lei, Wang Li, and Yang XuleiIn ICASSP 2020-2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2020
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Aim-Net: Bring Implicit Euler to Network DesignYuan Qiongwen, He Jingwei, Yu Lei โ๏ธ, and Zheng GangIn 2020 IEEE International Conference on Image Processing (ICIP), 2020
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Structured Bayesian learning for recovery of clustered sparse signalWang Lu, Zhao Lifan, Yu Lei โ๏ธ, Wang Jingjing, and Bi GuoanSignal Processing, 2020
This paper considers the problem of recovering sparse signals with cluster structure of unknown sizes and locations. A hybrid prior is proposed by introducing a local continuity indicator, which adaptively imposes cluster information on the sparse coefficients according to the inherent data structure. The local continuity indicator flexibly switches the prior for a sparse coefficient between a fully pattern-coupled one and an independent one, so that the estimation of the sparse coefficient can selectively use the statistical information of its neighbors. Variational Bayesian inference is used to estimate the hidden variables based on the constructed probabilistic modeling. Numerical results of comprehensive simulations and real data experiments demonstrate that the proposed algorithm can effectively avoid the problem of structural mismatch and outperform other recently reported clustered sparse signal recovery algorithms in noisy environments.
2019
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Algorithm to compute nonlinear partial observer normal form with multiple outputsSaadi Wided, Boutat Driss, Zheng Gang, Sbita Lassaad, and Yu LeiIEEE Transactions on Automatic Control, 2019๐ฅ TOP Journal
It is well-known that observer design is a powerful tool to estimate the states of a dynamical system. Given a multi-output nonlinear dynamical system whose states are partially observable, this paper investigates the problem of observer design to estimate those observable states. It considers firstly a nonlinear system without inputs, and provides a set of geometric conditions, guaranteeing the existence of a change of coordinates which splits the studied nonlinear dynamical system into two subsystems, where one of them is of the well-known nonlinear observer normal form, for which a Luenberger-like observer can be designed. An extension to nonlinear systems with inputs has then been deduced.
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DET: A High-Resolution DVS Dataset for Lane ExtractionCheng Wensheng, Luo Hao, Yang Wen, Yu Lei, Chen Shoushun, and Li WeiIn CVPR Workshops, 2019
Lane extraction is a basic yet necessary task for autonomous driving. Although past years have witnessed major advances in lane extraction with deep learning models, they all aim at ordinary RGB images generated by framebased cameras, which limits their performance in nature. To tackle this problem, we introduce Dynamic Vision Sensor (DVS), a type of event-based sensor to lane extraction task and build a high-resolution DVS dataset for lane extraction (DET). We collect the raw event data and generate 5,424 event-based sensor images with a resolution of 1280ร800, the highest one among all DVS datasets available now. These images include complex traf๏ฌc scenes and various lane types. All images of DET are annotated with multi-class segmentation format. The fully annotated DET images contains 17,103 lane instances, each of which is labeled pixel by pixel manually. We evaluate state-of-the-art lane extraction models on DET to build a benchmark for lane extraction task with event-based sensor images. Experimental results demonstrate that DET is quite challenging for even state-of-the-art lane extraction methods. DET is made publicly available, including the raw event data, accumulated images and labels1.
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Dynamical sparse signal recovery with fixed-time convergenceRen Junying, Yu Lei โ๏ธ, Lyu Chengcheng, Zheng Gang, Barbot Jean-Pierre, and Sun HongSignal Processing, 2019
Arising in a large number of application areas, sparse recovery (SR) has been exhaustively investigated and many algorithms have been proposed. Different from the numerical methods realized by iterative algorithm, the recent continuous approach is realized through analog circuit, which takes advantage of short time-delay and fast convergence. However, the existing continuous method for SR still has the space to further improve the convergence speed. Consequently, in this paper, we propose a new dynamical continuous system to solve the sparse signal recovery problem with fixed-time convergence property.
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Image Denoising via Nonlocal Low Rank Approximation With Local Structure PreservingLiu Zhou, Yu Lei โ๏ธ, and Sun HongIEEE Access, 2019
The nuclear norm minimization method emerged from a patch-based low-rank model leads to an excellent image denoising performance, where the non-local self-similarity over image patches is exploited. However, natural images are normally with complex and irregular image patches, which cannot be well represented using only a low-rank model, and thus most of them suffer from the over-penalty problem especially for images with lots of local irregular structures (e.g., fine details or sharp edges), and then results in over-smoothing problem after denoising. On the other hand, in order to represent the irregular components, edges defined over pixel level are often exploited. While the total variation (TV) is a well-known prior to remove noises and preserve edges, it might yield undesired staircase artifacts. The total generalized variation (TGV), a generalization of TV, can largely alleviate such staircase artifacts. Consequently, in order to deal with the over-smoothing problem aroused by a low-rank model, we propose a re-weighted TGV regularized nuclear norm minimization model for local structure preserving image denoising. Thanks to the split Bregman method, our proposed model can be effectively solved. A re-weighted strategy is developed to adaptively update the weight parameters of TGV regularization. The encouraging experimental results on noisy images demonstrate the effectiveness of our proposed method.
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A Dynamical System With Fixed Convergence Time for Sparse RecoveryRen Junying, Yu Lei โ๏ธ, Jiang Yulun, Barbot Jean-Pierre, and Sun HongIEEE Access, 2019
The sparse recovery (SR) algorithm, under the premise that signals are sparse, can be divided into two categories. One is a digital discrete method implemented via lots of iterative computations and the other is a continuous method implemented via analog circuits, which is usually faster. In this paper, we focus on the continuous method and propose a fixed-time convergence dynamical system. Compared with the existing system, it dynamically allocates the exponent according to time-varying elements of the system state, avoiding possible mismatches between the fixed exponent and some elements.
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Block-sparsity recovery via recurrent neural networkLyu Chengcheng, Liu Zhou, and Yu Lei โ๏ธSignal Processing, 2019
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Live Demonstration: Real-Time Vi-SLAM With High-Resolution Event CameraYang Gongyu, Ye Qilin, He Wanjun, Zhou Lifeng, Chen Xinyu, Yu Lei โ๏ธ, Yang Wen, Chen Shoushun, and Li WeiIn CVPR Workshops, 2019
Event camera is bio-inspired vision sensors that output pixel-level brightness changes asynchronously. Compared to the conventional frame-based camera, it is with high dynamic range, low latency and high sensitivity, and thus can be exploited in SLAM to tackle the problem of occasions with high-speed camera moving and low-light scenes. In this demo, we implement the visual-inerial SLAM in real time with the recently released event camera, namely, CeleX-V. With the feature of high spatial resolution (1280ร800) and low latency (\textless 0.5ยตs), the proposed method can provide frames with abundant textures and high time response, which leads to more stable tracking ability and better performance in SLAM system.
2018
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Image restoration via Bayesian dictionary learning with nonlocal structured beta processLiu Zhou, Yu Lei โ๏ธ, and Sun HongJournal of Visual Communication and Image Representation, 2018
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Image Super-Resolution via RL-CSC: When Residual Learning Meets Convolutional Sparse CodingZhang Menglei, Liu Zhou, and Yu Lei โ๏ธarXiv preprint arXiv:1812.11950, 2018
2017
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Dynamical sparse recovery with finite-time convergenceYu Lei โ๏ธ, Zheng Gang, and Barbot Jean-PierreIEEE Transactions on Signal Processing, 2017๐ฅ TOP Journal. Recover sparse signals with analog circuits.
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Sparse Bayesian learning for image rectification with transform invariant low-rank texturesHu Shihui, Liu Zhou, Yu Lei โ๏ธ, and Sun HongSignal Processing, 2017
2015
2012
2010
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Compressive sensing with chaotic sequenceYu Lei โ๏ธ, Barbot Jean Pierre, Zheng Gang, and Sun HongIEEE Signal Processing Letters, 2010๐ฅ A theoretical analysis of chaotic compressive sensing.
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Observability forms for switched systems with zeno phenomenon or high switching frequencyYu Lei โ๏ธ, Barbot Jean-Pierre, Boutat Driss, and Benmerzouk DjamilaIEEE Transactions on Automatic Control, 2010๐ฅ Top Journal
Event Camera
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Robust motion compensation for event cameras with smooth constraintXu Jie, Jiang Meng, Yu Lei โ๏ธ, Yang Wen, and Wang WenweiIEEE Transactions on Computational Imaging, 2020
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Event-based high frame-rate video reconstruction with a novel cycle-event networkSu Binyi, Yu Lei โ๏ธ, and Yang WenIn 2020 IEEE International Conference on Image Processing (ICIP), 2020
-
Robust Intensity Image Reconstruciton Based On Event CamerasJiang Meng, Liu Zhou, Wang Bishan, Yu Lei, and Yang WenIn 2020 IEEE International Conference on Image Processing (ICIP), 2020
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Matching Neuromorphic Events and Color Images via Adversarial LearningXu Fang, Lin Shijie, Yang Wen, Yu Lei, Dai Dengxin, and Xia Gui-songarXiv preprint arXiv:2003.00636, 2020
-
DET: A High-Resolution DVS Dataset for Lane ExtractionCheng Wensheng, Luo Hao, Yang Wen, Yu Lei, Chen Shoushun, and Li WeiIn CVPR Workshops, 2019
Lane extraction is a basic yet necessary task for autonomous driving. Although past years have witnessed major advances in lane extraction with deep learning models, they all aim at ordinary RGB images generated by framebased cameras, which limits their performance in nature. To tackle this problem, we introduce Dynamic Vision Sensor (DVS), a type of event-based sensor to lane extraction task and build a high-resolution DVS dataset for lane extraction (DET). We collect the raw event data and generate 5,424 event-based sensor images with a resolution of 1280ร800, the highest one among all DVS datasets available now. These images include complex traf๏ฌc scenes and various lane types. All images of DET are annotated with multi-class segmentation format. The fully annotated DET images contains 17,103 lane instances, each of which is labeled pixel by pixel manually. We evaluate state-of-the-art lane extraction models on DET to build a benchmark for lane extraction task with event-based sensor images. Experimental results demonstrate that DET is quite challenging for even state-of-the-art lane extraction methods. DET is made publicly available, including the raw event data, accumulated images and labels1.
-
Live Demonstration: Real-Time Vi-SLAM With High-Resolution Event CameraYang Gongyu, Ye Qilin, He Wanjun, Zhou Lifeng, Chen Xinyu, Yu Lei โ๏ธ, Yang Wen, Chen Shoushun, and Li WeiIn CVPR Workshops, 2019
Event camera is bio-inspired vision sensors that output pixel-level brightness changes asynchronously. Compared to the conventional frame-based camera, it is with high dynamic range, low latency and high sensitivity, and thus can be exploited in SLAM to tackle the problem of occasions with high-speed camera moving and low-light scenes. In this demo, we implement the visual-inerial SLAM in real time with the recently released event camera, namely, CeleX-V. With the feature of high spatial resolution (1280ร800) and low latency (\textless 0.5ยตs), the proposed method can provide frames with abundant textures and high time response, which leads to more stable tracking ability and better performance in SLAM system.
Sparse Recovery
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Spiking Sparse Recovery with Non-convex PenaltiesZhang Xiang, Yu Lei โ๏ธ, Zheng Gang, and Eldar YoninaIEEE Transactions on Signal Processing, 2023
-
Structured Bayesian learning for recovery of clustered sparse signalWang Lu, Zhao Lifan, Yu Lei โ๏ธ, Wang Jingjing, and Bi GuoanSignal Processing, 2020
This paper considers the problem of recovering sparse signals with cluster structure of unknown sizes and locations. A hybrid prior is proposed by introducing a local continuity indicator, which adaptively imposes cluster information on the sparse coefficients according to the inherent data structure. The local continuity indicator flexibly switches the prior for a sparse coefficient between a fully pattern-coupled one and an independent one, so that the estimation of the sparse coefficient can selectively use the statistical information of its neighbors. Variational Bayesian inference is used to estimate the hidden variables based on the constructed probabilistic modeling. Numerical results of comprehensive simulations and real data experiments demonstrate that the proposed algorithm can effectively avoid the problem of structural mismatch and outperform other recently reported clustered sparse signal recovery algorithms in noisy environments.
-
Distributed compressive sensing via LSTM-Aided sparse Bayesian learningZhang Haijian, Zhang Wusheng, Yu Lei โ๏ธ, and Bi GuoanSignal Processing, 2020
-
Block-sparsity recovery via recurrent neural networkLyu Chengcheng, Liu Zhou, and Yu Lei โ๏ธSignal Processing, 2019
-
Dynamical sparse signal recovery with fixed-time convergenceRen Junying, Yu Lei โ๏ธ, Lyu Chengcheng, Zheng Gang, Barbot Jean-Pierre, and Sun HongSignal Processing, 2019
Arising in a large number of application areas, sparse recovery (SR) has been exhaustively investigated and many algorithms have been proposed. Different from the numerical methods realized by iterative algorithm, the recent continuous approach is realized through analog circuit, which takes advantage of short time-delay and fast convergence. However, the existing continuous method for SR still has the space to further improve the convergence speed. Consequently, in this paper, we propose a new dynamical continuous system to solve the sparse signal recovery problem with fixed-time convergence property.
-
A Dynamical System With Fixed Convergence Time for Sparse RecoveryRen Junying, Yu Lei โ๏ธ, Jiang Yulun, Barbot Jean-Pierre, and Sun HongIEEE Access, 2019
The sparse recovery (SR) algorithm, under the premise that signals are sparse, can be divided into two categories. One is a digital discrete method implemented via lots of iterative computations and the other is a continuous method implemented via analog circuits, which is usually faster. In this paper, we focus on the continuous method and propose a fixed-time convergence dynamical system. Compared with the existing system, it dynamically allocates the exponent according to time-varying elements of the system state, avoiding possible mismatches between the fixed exponent and some elements.
-
Image Super-Resolution via RL-CSC: When Residual Learning Meets Convolutional Sparse CodingZhang Menglei, Liu Zhou, and Yu Lei โ๏ธarXiv preprint arXiv:1812.11950, 2018
-
Sparse Bayesian learning for image rectification with transform invariant low-rank texturesHu Shihui, Liu Zhou, Yu Lei โ๏ธ, and Sun HongSignal Processing, 2017
-
Dynamical sparse recovery with finite-time convergenceYu Lei โ๏ธ, Zheng Gang, and Barbot Jean-PierreIEEE Transactions on Signal Processing, 2017๐ฅ TOP Journal. Recover sparse signals with analog circuits.
Image Processing
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Image super-resolution by learning weighted convolutional sparse codingHe Jingwei, Yu Lei โ๏ธ, Liu Zhou, and Yang WenSignal, Image and Video Processing, 2021
-
Image Denoising via Nonlocal Low Rank Approximation With Local Structure PreservingLiu Zhou, Yu Lei โ๏ธ, and Sun HongIEEE Access, 2019
The nuclear norm minimization method emerged from a patch-based low-rank model leads to an excellent image denoising performance, where the non-local self-similarity over image patches is exploited. However, natural images are normally with complex and irregular image patches, which cannot be well represented using only a low-rank model, and thus most of them suffer from the over-penalty problem especially for images with lots of local irregular structures (e.g., fine details or sharp edges), and then results in over-smoothing problem after denoising. On the other hand, in order to represent the irregular components, edges defined over pixel level are often exploited. While the total variation (TV) is a well-known prior to remove noises and preserve edges, it might yield undesired staircase artifacts. The total generalized variation (TGV), a generalization of TV, can largely alleviate such staircase artifacts. Consequently, in order to deal with the over-smoothing problem aroused by a low-rank model, we propose a re-weighted TGV regularized nuclear norm minimization model for local structure preserving image denoising. Thanks to the split Bregman method, our proposed model can be effectively solved. A re-weighted strategy is developed to adaptively update the weight parameters of TGV regularization. The encouraging experimental results on noisy images demonstrate the effectiveness of our proposed method.
-
Image restoration via Bayesian dictionary learning with nonlocal structured beta processLiu Zhou, Yu Lei โ๏ธ, and Sun HongJournal of Visual Communication and Image Representation, 2018
Others
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Dynamic Coarse-To-Fine Learning for Oriented Tiny Object DetectionXu Chang, Ding Jian, Wang Jinwang, Yang Wen, Yu Huai, Yu Lei โ๏ธ, and Xia Gui-SongIn CVPR, 2023
-
Algorithm to compute nonlinear partial observer normal form with multiple outputsSaadi Wided, Boutat Driss, Zheng Gang, Sbita Lassaad, and Yu LeiIEEE Transactions on Automatic Control, 2019๐ฅ TOP Journal
It is well-known that observer design is a powerful tool to estimate the states of a dynamical system. Given a multi-output nonlinear dynamical system whose states are partially observable, this paper investigates the problem of observer design to estimate those observable states. It considers firstly a nonlinear system without inputs, and provides a set of geometric conditions, guaranteeing the existence of a change of coordinates which splits the studied nonlinear dynamical system into two subsystems, where one of them is of the well-known nonlinear observer normal form, for which a Luenberger-like observer can be designed. An extension to nonlinear systems with inputs has then been deduced.
-
Observability forms for switched systems with zeno phenomenon or high switching frequencyYu Lei โ๏ธ, Barbot Jean-Pierre, Boutat Driss, and Benmerzouk DjamilaIEEE Transactions on Automatic Control, 2010๐ฅ Top Journal