在这项工作中,我们开发了一个有效的求解器,该求解器基于泊松方程的深神经网络,具有可变系数和由Dirac Delta函数$ \ delta(\ Mathbf {x})$表示的可变系数和单数来源。这类问题涵盖了一般点源,线路源和点线组合,并且具有广泛的实际应用。所提出的方法是基于将真实溶液分解为一个单一部分,该部分使用拉普拉斯方程的基本解决方案在分析上以分析性的方式,以及一个正常零件,该零件满足适合的椭圆形PDE,并使用更平滑的来源,然后使用深层求解常规零件,然后使用深层零件来求解。丽兹法。建议提出遵守路径遵循的策略来选择罚款参数以惩罚Dirichlet边界条件。提出了具有点源,线源或其组合的两维空间和多维空间中的广泛数值实验,以说明所提出的方法的效率,并提供了一些现有方法的比较研究,这清楚地表明了其竞争力的竞争力具体的问题类别。此外,我们简要讨论该方法的误差分析。
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Channel and spatial attention mechanism has proven to provide an evident performance boost of deep convolution neural networks (CNNs). Most existing methods focus on one or run them parallel (series), neglecting the collaboration between the two attentions. In order to better establish the feature interaction between the two types of attention, we propose a plug-and-play attention module, which we term "CAT"-activating the Collaboration between spatial and channel Attentions based on learned Traits. Specifically, we represent traits as trainable coefficients (i.e., colla-factors) to adaptively combine contributions of different attention modules to fit different image hierarchies and tasks better. Moreover, we propose the global entropy pooling (GEP) apart from global average pooling (GAP) and global maximum pooling (GMP) operators, an effective component in suppressing noise signals by measuring the information disorder of feature maps. We introduce a three-way pooling operation into attention modules and apply the adaptive mechanism to fuse their outcomes. Extensive experiments on MS COCO, Pascal-VOC, Cifar-100, and ImageNet show that our CAT outperforms existing state-of-the-art attention mechanisms in object detection, instance segmentation, and image classification. The model and code will be released soon.
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Vehicle re-identification (Re-ID) is a critical component of the autonomous driving perception system, and research in this area has accelerated in recent years. However, there is yet no perfect solution to the vehicle re-identification issue associated with the car's surround-view camera system. Our analysis identifies two significant issues in the aforementioned scenario: i) It is difficult to identify the same vehicle in many picture frames due to the unique construction of the fisheye camera. ii) The appearance of the same vehicle when seen via the surround vision system's several cameras is rather different. To overcome these issues, we suggest an integrative vehicle Re-ID solution method. On the one hand, we provide a technique for determining the consistency of the tracking box drift with respect to the target. On the other hand, we combine a Re-ID network based on the attention mechanism with spatial limitations to increase performance in situations involving multiple cameras. Finally, our approach combines state-of-the-art accuracy with real-time performance. We will soon make the source code and annotated fisheye dataset available.
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Obtaining the position of ego-vehicle is a crucial prerequisite for automatic control and path planning in the field of autonomous driving. Most existing positioning systems rely on GPS, RTK, or wireless signals, which are arduous to provide effective localization under weak signal conditions. This paper proposes a real-time positioning system based on the detection of the parking numbers as they are unique positioning marks in the parking lot scene. It does not only can help with the positioning with open area, but also run independently under isolation environment. The result tested on both public datasets and self-collected dataset show that the system outperforms others in both performances and applies in practice. In addition, the code and dataset will release later.
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Surround-view fisheye perception under valet parking scenes is fundamental and crucial in autonomous driving. Environmental conditions in parking lots perform differently from the common public datasets, such as imperfect light and opacity, which substantially impacts on perception performance. Most existing networks based on public datasets may generalize suboptimal results on these valet parking scenes, also affected by the fisheye distortion. In this article, we introduce a new large-scale fisheye dataset called Fisheye Parking Dataset(FPD) to promote the research in dealing with diverse real-world surround-view parking cases. Notably, our compiled FPD exhibits excellent characteristics for different surround-view perception tasks. In addition, we also propose our real-time distortion-insensitive multi-task framework Fisheye Perception Network (FPNet), which improves the surround-view fisheye BEV perception by enhancing the fisheye distortion operation and multi-task lightweight designs. Extensive experiments validate the effectiveness of our approach and the dataset's exceptional generalizability.
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空间红外的小型船舶检测旨在将小型船只与轨道轨道捕获的图像分开。由于图像覆盖面积极大(例如,数千平方公里),这些图像中的候选目标比空中基于天线和陆基成像设备观察到的目标要小得多,二聚体,更可变。现有的简短成像基于距离的红外数据集和目标检测方法不能很好地用于空间监视任务。为了解决这些问题,我们开发了一个空间红外的小型船舶检测数据集(即Nudt-Sirst-Sea),该数据集具有48个空间基红外图像和17598像素级的小型船上注释。每个图像覆盖约10000平方公里的面积,带有10000x10000像素。考虑到这些充满挑战的场景,考虑到这些微小的船只的极端特征(例如,小,昏暗,可变的),我们在本文中提出了多层Transunet(MTU-NET)。具体而言,我们设计了视觉变压器(VIT)卷积神经网络(CNN)混合编码器来提取多层次特征。首先将局部特征图用几个卷积层提取,然后馈入多级特征提取模块(MVTM)以捕获长距离依赖性。我们进一步提出了一种拷贝性衡量量 - 帕斯特(CRRP)数据增强方法,以加速训练阶段,从而有效地减轻了目标和背景之间样本不平衡问题的问题。此外,我们设计了一个焦点损失,以实现目标定位和形状描述。 NUDT-SIRST-SEA数据集的实验结果表明,就检测概率,错误警报率和联合交集的交集而言,我们的MTU-NET优于传统和现有的基于深度学习的SIRST方法。
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控制系统通常需要满足严格的安全要求。安全指数提供了一种方便的方法来评估系统的安全水平并得出所得的安全控制策略。但是,在控制范围内设计安全指数功能是困难的,需要大量的专家知识。本文提出了一个框架,用于使用方案总和编程合成通用控制系统的安全指数。我们的方法是表明,确保对安全设置边界的安全控制的非空缺等同于当地的多种积极问题。然后,我们证明了这个问题等同于通过代数几何形状的Pitivstellensatz进行编程。我们验证具有不同自由度和地面车辆的机器人臂上的拟议方法。结果表明,合成的安全指数可确保安全性,即使在高维机器人系统中,我们的方法也有效。
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模型不匹配在现实世界应用中占上风。因此,为具有不确定动态模型的系统设计可靠的安全控制算法很重要。主要的挑战是,不确定性导致难以实时寻找可行的安全控制。现有方法通常简化了问题,例如限制不确定性类型,忽略控制限制或放弃可行性保证。在这项工作中,我们通过为有限国家依赖性的不确定性提出一个强大的安全控制框架来克服这些问题。我们首先通过学习控制控制限制,不确定的安全性索引来保证安全控制不确定动态的可行性。然后,我们证明可以将稳健的安全控制作为凸问题(凸度半侵入编程或二阶锥编程)配制,并提出可以实时运行的相应最佳求解器。此外,我们分析了在未建模的不确定性下何时以及如何保留安全性。实验结果表明,我们的方法成功地发现了针对不同的不确定性实时的可靠安全控制,并且比强大的基线算法要保守得多。
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商业深度传感器通常会产生嘈杂和缺失的深度,尤其是在镜面和透明的对象上,这对下游深度或基于点云的任务构成了关键问题。为了减轻此问题,我们提出了一个强大的RGBD融合网络Swindrnet,以进行深度修复。我们进一步提出了域随机增强深度模拟(DREDS)方法,以使用基于物理的渲染模拟主动的立体声深度系统,并生成一个大规模合成数据集,该数据集包含130k Photorealistic RGB图像以及其模拟深度带有现实主义的传感器。为了评估深度恢复方法,我们还策划了一个现实世界中的数据集,即STD,该数据集捕获了30个混乱的场景,这些场景由50个对象组成,具有不同的材料,从透明,透明,弥漫性。实验表明,提议的DREDS数据集桥接了SIM到实地域间隙,因此,经过训练,我们的Swindrnet可以无缝地概括到其他真实的深度数据集,例如。 ClearGrasp,并以实时速度优于深度恢复的竞争方法。我们进一步表明,我们的深度恢复有效地提高了下游任务的性能,包括类别级别的姿势估计和掌握任务。我们的数据和代码可从https://github.com/pku-epic/dreds获得
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在许多应用程序中,多方拥有有关相同用户的私人数据,但在属性的脱节集上,服务器希望利用数据来训练模型。为了在保护数据主体的隐私时启用模型学习,我们需要垂直联合学习(VFL)技术,其中数据派对仅共享用于培训模型的信息,而不是私人数据。但是,确保共享信息在学习准确的模型的同时保持隐私是一项挑战。据我们所知,本文提出的算法是第一个实用的解决方案,用于差异化垂直联合K-均值聚类,服务器可以在其中获得具有可证明的差异隐私保证的全球中心。我们的算法假设一个不受信任的中央服务器,该服务器汇总了本地数据派对的差异私有本地中心和成员资格编码。它基于收到的信息构建加权网格作为全局数据集的概要。最终中心是通过在加权网格上运行任何K-均值算法而产生的。我们的网格重量估计方法采用了基于Flajolet-Martin草图的新颖,轻巧和差异私有的相交基数估计算法。为了提高两个以上数据方的设置中的估计准确性,我们进一步提出了权重估计算法的精致版本和参数调整策略,以减少最终的K-均值实用程序,以便在中央私人环境中接近它。我们为由我们的算法计算的群集中心提供了理论实用性分析和实验评估结果,并表明我们的方法在理论上和经验上都比基于现有技术的两个基准在理论上和经验上的表现更好。
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