We present a new method for generating controllable, dynamically responsive, and photorealistic human animations. Given an image of a person, our system allows the user to generate Physically plausible Upper Body Animation (PUBA) using interaction in the image space, such as dragging their hand to various locations. We formulate a reinforcement learning problem to train a dynamic model that predicts the person's next 2D state (i.e., keypoints on the image) conditioned on a 3D action (i.e., joint torque), and a policy that outputs optimal actions to control the person to achieve desired goals. The dynamic model leverages the expressiveness of 3D simulation and the visual realism of 2D videos. PUBA generates 2D keypoint sequences that achieve task goals while being responsive to forceful perturbation. The sequences of keypoints are then translated by a pose-to-image generator to produce the final photorealistic video.
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Estimating 3D human motion from an egocentric video sequence is critical to human behavior understanding and applications in VR/AR. However, naively learning a mapping between egocentric videos and human motions is challenging, because the user's body is often unobserved by the front-facing camera placed on the head of the user. In addition, collecting large-scale, high-quality datasets with paired egocentric videos and 3D human motions requires accurate motion capture devices, which often limit the variety of scenes in the videos to lab-like environments. To eliminate the need for paired egocentric video and human motions, we propose a new method, Ego-Body Pose Estimation via Ego-Head Pose Estimation (EgoEgo), that decomposes the problem into two stages, connected by the head motion as an intermediate representation. EgoEgo first integrates SLAM and a learning approach to estimate accurate head motion. Then, taking the estimated head pose as input, it leverages conditional diffusion to generate multiple plausible full-body motions. This disentanglement of head and body pose eliminates the need for training datasets with paired egocentric videos and 3D human motion, enabling us to leverage large-scale egocentric video datasets and motion capture datasets separately. Moreover, for systematic benchmarking, we develop a synthetic dataset, AMASS-Replica-Ego-Syn (ARES), with paired egocentric videos and human motion. On both ARES and real data, our EgoEgo model performs significantly better than the state-of-the-art.
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3D convolutional neural networks have revealed superior performance in processing volumetric data such as video and medical imaging. However, the competitive performance by leveraging 3D networks results in huge computational costs, which are far beyond that of 2D networks. In this paper, we propose a novel Hilbert curve-based cross-dimensionality distillation approach that facilitates the knowledge of 3D networks to improve the performance of 2D networks. The proposed Hilbert Distillation (HD) method preserves the structural information via the Hilbert curve, which maps high-dimensional (>=2) representations to one-dimensional continuous space-filling curves. Since the distilled 2D networks are supervised by the curves converted from dimensionally heterogeneous 3D features, the 2D networks are given an informative view in terms of learning structural information embedded in well-trained high-dimensional representations. We further propose a Variable-length Hilbert Distillation (VHD) method to dynamically shorten the walking stride of the Hilbert curve in activation feature areas and lengthen the stride in context feature areas, forcing the 2D networks to pay more attention to learning from activation features. The proposed algorithm outperforms the current state-of-the-art distillation techniques adapted to cross-dimensionality distillation on two classification tasks. Moreover, the distilled 2D networks by the proposed method achieve competitive performance with the original 3D networks, indicating the lightweight distilled 2D networks could potentially be the substitution of cumbersome 3D networks in the real-world scenario.
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在本文中,我们提出了用于滚动快门摄像机的概率连续时间视觉惯性频道(VIO)。连续的时轨迹公式自然促进异步高频IMU数据和运动延伸的滚动快门图像的融合。为了防止棘手的计算负载,提出的VIO是滑动窗口和基于密钥帧的。我们建议概率地将控制点边缘化,以保持滑动窗口中恒定的密钥帧数。此外,可以在我们的连续时间VIO中在线校准滚动快门相机的线曝光时间差(线延迟)。为了广泛检查我们的连续时间VIO的性能,对公共可用的WHU-RSVI,TUM-RSVI和Sensetime-RSVI Rolling快门数据集进行了实验。结果表明,提出的连续时间VIO显着优于现有的最新VIO方法。本文的代码库也将通过\ url {https://github.com/april-zju/ctrl-vio}开源。
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我们提出了一个名为Star-GNN的视频特征表示学习框架,该框架在多尺度晶格功能图上应用了可插入的图形神经网络组件。 Star-GNN的本质是利用时间动力学和空间内容以及帧中不同尺度区域之间的视觉连接。它对带有晶格特征图的视频进行建模,其中节点代表不同粒度的区域,其加权边缘代表空间和时间链接。上下文节点通过图形神经网络同时汇总,并具有训练有检索三重损失的参数。在实验中,我们表明Star-GNN有效地在视频框架序列上实现了动态注意机制,从而强调了视频中动态和语义丰富的内容,并且对噪声和冗余是强大的。经验结果表明,STAR-GNN可实现基于内容的视频检索的最新性能。
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经过对人体跟踪系统引起的隐私问题的调查,我们提出了一种黑盒对抗攻击方法,该方法对最先进的人类检测模型,称为Invisibilitee。该方法学习了可打印的对抗图案,适用于T恤,这些T恤在人体跟踪系统前的物理世界中抓起佩戴者。我们设计了一种角度不足的学习方案,该方案利用了时尚数据集的分割和几何扭曲过程,因此生成的对抗模式可有效从所有摄像机角度和看不见的黑盒检测模型欺骗人检测器。数字环境和物理环境中的经验结果表明,随着Invisibilitee的启用,人体跟踪系统检测佩戴者的能力显着下降。
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th骨海星(COTS)爆发是大屏障礁(GBR)珊瑚损失的主要原因,并且正在进行实质性的监视和控制计划,以将COTS人群管理至生态可持续的水平。在本文中,我们在边缘设备上介绍了基于水下的水下数据收集和策展系统,以进行COTS监视。特别是,我们利用了基于深度学习的对象检测技术的功能,并提出了一种资源有效的COTS检测器,该检测器在边缘设备上执行检测推断,以帮助海上专家在数据收集阶段进行COTS识别。初步结果表明,可以将改善计算效率的几种策略(例如,批处理处理,帧跳过,模型输入大小)组合在一起,以在Edge硬件上运行拟议的检测模型,资源消耗较低,信息损失较低。
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我们考虑了自主渠道访问(AutoCA)的问题,其中一组终端试图以分布式方式通过常见的无线通道发现具有访问点(AP)的通信策略。由于拓扑不规则和终端的通信范围有限,因此对AutoCA的实用挑战是隐藏的终端问题,在无线网络中臭名昭著,可以使吞吐量和延迟性能恶化。为了应对挑战,本文提出了一种新的多代理深钢筋学习范式,该学习范式被称为Madrl-HT,在存在隐藏码头的情况下为Autoca量身定制。 MADRL-HT利用拓扑见解,并将每个终端的观察空间转变为独立于终端数量的可扩展形式。为了补偿部分可观察性,我们提出了一种外观机制,以便终端可以从载体感知的通道状态以及AP的反馈中推断出其隐藏终端的行为。提出了基于窗口的全球奖励功能,从而指示终端在学习过程中平衡终端的传输机会,以最大程度地提高系统吞吐量。广泛的数值实验验证了我们的解决方案基准测试的优越性能,并通过避免碰撞(CSMA/CA)方案对旧的载体 - 义值访问。
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我们使用来自多种传感模式的数据,即加速度计和全球导航卫星系统(GNSS)来对动物行为进行分类。我们从GNSS数据中提取三个新功能,即距水点,中值和中位数估计的水平位置误差的距离。我们考虑了将加速度计和GNSS数据可用信息组合的两种方法。第一种方法是基于从传感器数据中提取的特征并将串联特征向量馈入多层感知器(MLP)分类器中的串联。第二种方法是基于将两个MLP分类器预测的后验概率融合,每个概率每个都以从一个传感器的数据为输入中提取的功能。我们使用两个通过智能牛领和耳号收集的现实世界数据集评估了开发的多模式动物行为行为分类算法的性能。一对一的动物交叉验证结果表明,这两种方法都可以显着改善分类性能,而仅使用一种传感模式的数据,特别是对于步行和饮酒的不经常但重要的行为。基于两种方法开发的算法都需要相当小的计算和内存资源,因此适合于我们的衣领和耳罩的嵌入式系统实现。但是,基于后验概率融合的多模式动物行为分类算法比基于特征串联的算法更可取,因为它提供了更好的分类精度,具有较低的计算和记忆复杂性,对传感器数据失败更强大,并且享受更好的模块化。 。
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阿尔茨海默氏病(AD)的早期诊断对于促进预防性护理以延迟进一步发展至关重要。本文介绍了建立在痴呆症Pitt copus上的基于最新的构象识别系统以自动检测的开发。通过纳入一组有目的设计的建模功能,包括基于域搜索的自动配置特异性构象异构体超参数除外,还包括基于速度扰动和基于规格的数据增强训练的基线构象体系统可显着改善。使用学习隐藏单位贡献(LHUC)的细粒度老年人的适应性;以及与混合TDNN系统的基于两次通行的跨系统逆转。在48位老年人的评估数据上获得了总体单词错误率(相对34.8%)的总体单词错误率(相对34.8%)。使用最终系统的识别输出来提取文本特征,获得了最佳的基于语音识别的AD检测精度为91.7%。
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