Small differences in a person's motion can engage drastically different muscles. While most visual representations of human activity are trained from video, people learn from multimodal experiences, including from the proprioception of their own muscles. We present a new visual perception task and dataset to model muscle activation in human activities from monocular video. Our Muscles in Action (MIA) dataset consists of 2 hours of synchronized video and surface electromyography (sEMG) data of subjects performing various exercises. Using this dataset, we learn visual representations that are predictive of muscle activation from monocular video. We present several models, including a transformer model, and measure their ability to generalize to new exercises and subjects. Putting muscles into computer vision systems will enable richer models of virtual humans, with applications in sports, fitness, and AR/VR.
translated by 谷歌翻译
分析运动表现或预防伤害需要捕获人体在某些运动中施加的地面反作用力(GRF)。标准实践在受控环境中使用与力板配对的物理标记,但这是由于高成本,冗长的实现时间和重复实验中的差异所破坏。因此,我们提出了视频中的GRF推论。尽管最近的工作使用LSTM从2D观点估算GRF,但它们的建模和表示能力可能受到限制。首先,我们建议使用变压器体系结构从视频任务中解决GRF,这是第一个这样做的。然后,我们引入了新的损失,以最大程度地减少回归曲线中的高影响峰。我们还表明,对2D到3D人类姿势估计的训练和多任务学习可以提高对看不见动作的概括。在此不同的任务上进行预训练时,在较小(稀有)GRF数据集上进行填充时,可以提供良好的初始权重。我们评估了Laas Parkour和新收集的钳子数据集;与先前的方法相比,我们出现的误差降低了19%。
translated by 谷歌翻译
对人类姿势和行动的认可对于自治系统与人们顺利互动。然而,相机通常在2D中捕获人类的姿势,作为图像和视频,这在跨越识别任务具有挑战性的观点来具有显着的外观变化。为了解决这个问题,我们探讨了来自2D信息的3D人体姿势中的识别相似性,在现有工作中没有得到很好地研究。在这里,我们提出了一种从2D主体关节键盘学习紧凑型视图 - 不变的嵌入空间的方法,而不明确地预测3D姿势。通过确定性映射难以代表预测和遮挡的2D姿势的输入模糊,因此我们采用了嵌入空间的概率制定。实验结果表明,与3D姿态估计模型相比,我们的嵌入模型在不同相机视图中检索类似的姿势时达到更高的准确性。我们还表明,通过培训简单的时间嵌入模型,我们在姿势序列检索方面取得了卓越的性能,并大大减少了基于堆叠帧的嵌入式的嵌入维度,以实现高效的大规模检索。此外,为了使我们的嵌入能够使用部分可见的输入,我们进一步调查培训期间的不同关键点遮挡增强策略。我们证明这些遮挡增强显着提高了部分2D输入姿势的检索性能。行动识别和视频对齐的结果表明,使用我们的嵌入没有任何额外培训,可以实现相对于每个任务专门培训的其他模型的竞争性能。
translated by 谷歌翻译
With the continuously thriving popularity around the world, fitness activity analytic has become an emerging research topic in computer vision. While a variety of new tasks and algorithms have been proposed recently, there are growing hunger for data resources involved in high-quality data, fine-grained labels, and diverse environments. In this paper, we present FLAG3D, a large-scale 3D fitness activity dataset with language instruction containing 180K sequences of 60 categories. FLAG3D features the following three aspects: 1) accurate and dense 3D human pose captured from advanced MoCap system to handle the complex activity and large movement, 2) detailed and professional language instruction to describe how to perform a specific activity, 3) versatile video resources from a high-tech MoCap system, rendering software, and cost-effective smartphones in natural environments. Extensive experiments and in-depth analysis show that FLAG3D contributes great research value for various challenges, such as cross-domain human action recognition, dynamic human mesh recovery, and language-guided human action generation. Our dataset and source code will be publicly available at https://andytang15.github.io/FLAG3D.
translated by 谷歌翻译
We introduce a new dataset, Human3.6M, of 3.6 Million accurate 3D Human poses, acquired by recording the performance of 5 female and 6 male subjects, under 4 different viewpoints, for training realistic human sensing systems and for evaluating the next generation of human pose estimation models and algorithms. Besides increasing the size of the datasets in the current state of the art by several orders of magnitude, we also aim to complement such datasets with a diverse set of motions and poses encountered as part of typical human activities (taking photos, talking on the phone, posing, greeting, eating, etc.), with additional synchronized image, human motion capture and time of flight (depth) data, and with accurate 3D body scans of all the subject actors involved. We also provide controlled mixed reality evaluation scenarios where 3D human models are animated using motion capture and inserted using correct 3D geometry, in complex real environments, viewed with moving cameras, and under occlusion. Finally, we provide a set of large scale statistical models and detailed evaluation baselines for the dataset illustrating its diversity and the scope for improvement by future work in the research community. Our experiments show that our best large scale model can leverage our full training set to obtain a 20% improvement in performance compared to a training set of the scale of the largest existing public dataset for this problem. Yet the potential for improvement by leveraging higher capacity, more complex models with our large dataset, is substantially vaster and should stimulate future research. The dataset together with code for the associated large-scale learning models, features, visualization tools, as well as the evaluation server, is available online at http://vision.imar.ro/human3.6m.
translated by 谷歌翻译
本文认为共同解决估计3D人体的高度相关任务,并从RGB图像序列预测未来的3D运动。基于Lie代数姿势表示,提出了一种新的自投影机制,自然保留了人类运动运动学。通过基于编码器 - 解码器拓扑的序列到序列的多任务架构进一步促进了这一点,这使我们能够利用两个任务共享的公共场所。最后,提出了一个全球细化模块来提高框架的性能。我们的方法称为PoMomemet的效力是通过消融测试和人文3.6M和Humaneva-I基准的实证评估,从而获得与最先进的竞争性能。
translated by 谷歌翻译
在本文中,我们介绍一种方法来自动重建与来自单个RGB视频相互作用的人的3D运动。我们的方法估计人的3D与物体姿势,接触位置和施加在人体上的接触力的姿势。这项工作的主要贡献是三倍。首先,我们介绍一种通过建模触点和相互作用的动态来联合估计人与人的运动和致动力的方法。这是一个大规模的轨迹优化问题。其次,我们开发一种方法来从输入视频自动识别,从输入视频中识别人和物体或地面之间的2D位置和时序,从而显着简化了优化的复杂性。第三,我们在最近的视频+ Mocap数据集上验证了捕获典型的Parkour行动的方法,并在互联网视频的新数据集上展示其表现,显示人们在不受约束的环境中操纵各种工具。
translated by 谷歌翻译
We propose a CNN-based approach for 3D human body pose estimation from single RGB images that addresses the issue of limited generalizability of models trained solely on the starkly limited publicly available 3D pose data. Using only the existing 3D pose data and 2D pose data, we show state-of-the-art performance on established benchmarks through transfer of learned features, while also generalizing to in-the-wild scenes. We further introduce a new training set for human body pose estimation from monocular images of real humans that has the ground truth captured with a multi-camera marker-less motion capture system. It complements existing corpora with greater diversity in pose, human appearance, clothing, occlusion, and viewpoints, and enables an increased scope of augmentation. We also contribute a new benchmark that covers outdoor and indoor scenes, and demonstrate that our 3D pose dataset shows better in-the-wild performance than existing annotated data, which is further improved in conjunction with transfer learning from 2D pose data. All in all, we argue that the use of transfer learning of representations in tandem with algorithmic and data contributions is crucial for general 3D body pose estimation.
translated by 谷歌翻译
预测人类运动对于辅助机器人和AR/VR应用至关重要,在这种机器人和AR/VR应用中,与人类的互动需要安全舒适。同时,准确的预测取决于理解场景上下文和人类意图。尽管许多作品研究场景 - 意识到人类的运动预测,但由于缺乏以自我为中心的观点,这些观点揭示了人类意图以及运动和场景的多样性有限,因此后者在很大程度上并没有得到充实的影响。为了减少差距,我们提出了一个大规模的人类运动数据集,该数据集可提供高质量的身体姿势序列,场景扫描以及以自我为中心的视图,目光注视,这是推断人类意图的代孕。通过使用惯性传感器进行运动捕获,我们的数据收集与特定场景无关,这进一步增强了从主题中观察到的运动动力学。我们对利用眼睛目光进行以自我为中心的人类运动预测的优势进行了广泛的研究,并进行了各种最新的架构。此外,为了实现目光的全部潜力,我们提出了一种新型的网络体系结构,该架构可以在目光和运动分支之间进行双向交流。我们的网络在拟议的数据集上实现了人类运动预测的最高性能,这要归功于眼睛凝视的意图信息以及动作调制的DeNocied Ceaze特征。代码和数据可以在https://github.com/y-zheng18/gimo上找到。
translated by 谷歌翻译
设计可以成功部署在日常生活环境中的活动检测系统需要构成现实情况典型挑战的数据集。在本文中,我们介绍了一个新的未修剪日常生存数据集,该数据集具有几个现实世界中的挑战:Toyota Smarthome Untrimmed(TSU)。 TSU包含以自发方式进行的各种活动。数据集包含密集的注释,包括基本的,复合活动和涉及与对象相互作用的活动。我们提供了对数据集所需的现实世界挑战的分析,突出了检测算法的开放问题。我们表明,当前的最新方法无法在TSU数据集上实现令人满意的性能。因此,我们提出了一种新的基线方法,以应对数据集提供的新挑战。此方法利用一种模态(即视线流)生成注意力权重,以指导另一种模态(即RGB)以更好地检测活动边界。这对于检测以高时间差异为特征的活动特别有益。我们表明,我们建议在TSU和另一个受欢迎的挑战数据集Charades上优于最先进方法的方法。
translated by 谷歌翻译
视频中的人类对象相互作用(HOI)识别对于分析人类活动很重要。在现实世界中,大多数关注视觉特征的工作通常都会受到阻塞。当HOI中有多个人和物体涉及时,这种问题将更加复杂。考虑到诸如人类姿势和物体位置之类的几何特征提供有意义的信息来了解HOI,我们认为将视觉和几何特征的好处结合在HOI识别中,并提出了一个新颖的两级几何形状特征信息信息图形卷积(2G) -GCN)。几何级图模拟了人类和对象的几何特征之间的相互依赖性,而融合级别的图将它们与人类和对象的视觉特征融合在一起。为了证明我们方法在挑战性场景中的新颖性和有效性,我们提出了一个新的多人HOI数据集(Mphoi-72)。关于Mphoi-72(多人HOI),CAD-1220(单人HOI)和双人动作(双手HOI)数据集的广泛实验证明了我们的表现与最先进的表现相比。
translated by 谷歌翻译
事件摄像头是一种新兴的生物启发的视觉传感器,每像素亮度不同步地变化。它具有高动态范围,高速响应和低功率预算的明显优势,使其能够在不受控制的环境中最好地捕获本地动作。这激发了我们释放事件摄像机进行人姿势估计的潜力,因为很少探索人类姿势估计。但是,由于新型范式从传统的基于框架的摄像机转变,时间间隔中的事件信号包含非常有限的信息,因为事件摄像机只能捕获移动的身体部位并忽略那些静态的身体部位,从而导致某些部位不完整甚至在时间间隔中消失。本文提出了一种新型的密集连接的复发架构,以解决不完整信息的问题。通过这种经常性的体系结构,我们可以明确地对跨时间步骤的顺序几何一致性进行明确模拟,从而从以前的帧中积累信息以恢复整个人体,从而从事件数据中获得稳定且准确的人类姿势估计。此外,为了更好地评估我们的模型,我们收集了一个基于人类姿势注释的大型多模式事件数据集,该数据集是迄今为止我们所知的最具挑战性的数据集。两个公共数据集和我们自己的数据集的实验结果证明了我们方法的有效性和强度。代码可以在线提供,以促进未来的研究。
translated by 谷歌翻译
In this work, we demonstrate that 3D poses in video can be effectively estimated with a fully convolutional model based on dilated temporal convolutions over 2D keypoints. We also introduce back-projection, a simple and effective semi-supervised training method that leverages unlabeled video data. We start with predicted 2D keypoints for unlabeled video, then estimate 3D poses and finally back-project to the input 2D keypoints. In the supervised setting, our fully-convolutional model outperforms the previous best result from the literature by 6 mm mean per-joint position error on Human3.6M, corresponding to an error reduction of 11%, and the model also shows significant improvements on HumanEva-I. Moreover, experiments with back-projection show that it comfortably outperforms previous state-of-the-art results in semisupervised settings where labeled data is scarce. Code and models are available at https://github.com/ facebookresearch/VideoPose3D
translated by 谷歌翻译
瑜伽是全球广受好评的,广泛推荐的健康生活实践。在执行瑜伽时保持正确的姿势至关重要。在这项工作中,我们采用了从人类姿势估计模型中的转移学习来提取整个人体的136个关键点,以训练一个随机的森林分类器,该分类器用于估算瑜伽室。在内部收集的内部收集的瑜伽视频数据库中评估了结果,该数据库是从4个不同的相机角度记录的51个主题。我们提出了一个三步方案,用于通过对1)看不见的帧,2)看不见的受试者进行测试来评估瑜伽分类器的普遍性。我们认为,对于大多数应用程序,对看不见的主题的验证精度和看不见的摄像头是最重要的。我们经验分析了三个公共数据集,转移学习的优势以及目标泄漏的可能性。我们进一步证明,分类精度在很大程度上取决于所采用的交叉验证方法,并且通常会产生误导。为了促进进一步的研究,我们已公开提供关键点数据集和代码。
translated by 谷歌翻译
可穿戴摄像机可以从用户的角度获取图像和视频。可以处理这些数据以了解人类的行为。尽管人类的行为分析已在第三人称视野中进行了彻底的研究,但仍在以自我为中心的环境中,尤其是在工业场景中进行了研究。为了鼓励在该领域的研究,我们介绍了Meccano,这是一个以自我为中心视频的多式模式数据集来研究类似工业的环境中的人类行为理解。多模式的特征是凝视信号,深度图和RGB视频同时使用自定义耳机获得。该数据集已在从第一人称视角的人类行为理解的背景下明确标记为基本任务,例如识别和预测人类对象的相互作用。使用MECCANO数据集,我们探索了五个不同的任务,包括1)动作识别,2)活动对象检测和识别,3)以自我为中心的人类对象互动检测,4)动作预期和5)下一步活动对象检测。我们提出了一个旨在研究人类行为的基准,该基准在被考虑的类似工业的情况下,表明所研究的任务和所考虑的方案对于最先进的算法具有挑战性。为了支持该领域的研究,我们在https://iplab.dmi.unict.it/meccano/上公开发布数据集。
translated by 谷歌翻译
From an image of a person in action, we can easily guess the 3D motion of the person in the immediate past and future. This is because we have a mental model of 3D human dynamics that we have acquired from observing visual sequences of humans in motion. We present a framework that can similarly learn a representation of 3D dynamics of humans from video via a simple but effective temporal encoding of image features. At test time, from video, the learned temporal representation give rise to smooth 3D mesh predictions. From a single image, our model can recover the current 3D mesh as well as its 3D past and future motion. Our approach is designed so it can learn from videos with 2D pose annotations in a semi-supervised manner. Though annotated data is always limited, there are millions of videos uploaded daily on the Internet. In this work, we harvest this Internet-scale source of unlabeled data by training our model on unlabeled video with pseudo-ground truth 2D pose obtained from an off-the-shelf 2D pose detector. Our experiments show that adding more videos with pseudo-ground truth 2D pose monotonically improves 3D prediction performance. We evaluate our model, Human Mesh and Motion Recovery (HMMR), on the recent challenging dataset of 3D Poses in the Wild and obtain state-of-the-art performance on the 3D prediction task without any fine-tuning. The project website with video, code, and data can be found at https://akanazawa.github.io/ human_dynamics/.
translated by 谷歌翻译
A core challenge for an agent learning to interact with the world is to predict how its actions affect objects in its environment. Many existing methods for learning the dynamics of physical interactions require labeled object information. However, to scale real-world interaction learning to a variety of scenes and objects, acquiring labeled data becomes increasingly impractical. To learn about physical object motion without labels, we develop an action-conditioned video prediction model that explicitly models pixel motion, by predicting a distribution over pixel motion from previous frames. Because our model explicitly predicts motion, it is partially invariant to object appearance, enabling it to generalize to previously unseen objects. To explore video prediction for real-world interactive agents, we also introduce a dataset of 59,000 robot interactions involving pushing motions, including a test set with novel objects. In this dataset, accurate prediction of videos conditioned on the robot's future actions amounts to learning a "visual imagination" of different futures based on different courses of action. Our experiments show that our proposed method produces more accurate video predictions both quantitatively and qualitatively, when compared to prior methods.
translated by 谷歌翻译
在本文中,我们提出了一种新的方法来增强从单个可佩戴相机捕获的视频计算的人的3D身体姿势估计。关键的想法是利用在联合嵌入空间中链接第一和第三次视图的高级功能。为了了解这样的嵌入空间,我们介绍了First2第三姿势,这是一个近2,000个视频的新配对同步数据集,描绘了从第一和第三视角捕获的人类活动。我们明确地考虑了空间和运动域功能,同时使用以自我监督的方式培训的半暹罗架构。实验结果表明,使用我们的数据集学习的联合多视图嵌入式空间可用于从任意单视图的自拍视频中提取歧视特征,而无需需要域适应,也不知道相机参数。在三种监督最先进的方法中,我们在两个无约束数据集中实现了重大改善了两个无约束的数据集。我们的数据集和代码将可用于研究目的。
translated by 谷歌翻译
虽然许多动作识别技术在公共基准上取得了巨大成功,但是这种性能不一定在现实世界方案中复制,其中数据来自特定的应用要求。我们专注于本文的具体实际应用是使用认知要求苛刻的物理任务的儿童的认知评估。我们创建了一个称为跨你身体和录制数据的系统,这些数据在几个方面是独一无二的,包括故障学家设计的事实,受试者是儿童,并且视频捕获现实世界使用量在心理学家的现实世界评估期间表演任务的儿童。我们系统的其他显着特征是它的分数可以直接翻译,以测量执行功能,这是区分青少年儿童中ADHD发作的关键因素之一。由于不精确的儿童执行的行动的执行以及存在细粒度运动模式的存在,我们系统地研究和评估了记录数据的相关方法。我们的目标是,该系统将有助于推进对儿童认知评估的研究。
translated by 谷歌翻译
培训视频中人类姿势估计的最先进模型需要具有很难获得的注释的数据集。尽管最近已将变压器用于身体姿势序列建模,但相关方法依靠伪地真相来增强目前有限的培训数据可用于学习此类模型。在本文中,我们介绍了Posebert,Posebert是一个通过掩盖建模对3D运动捕获(MOCAP)数据进行全面训练的变压器模块。它是简单,通用和通用的,因为它可以插入任何基于图像的模型的顶部,以在基于视频的模型中使用时间信息。我们展示了Posebert的变体,不同的输入从3D骨骼关键点到全身或仅仅是手(Mano)的3D参数模型的旋转。由于Posebert培训是任务不可知论的,因此该模型可以应用于姿势细化,未来的姿势预测或运动完成等几个任务。我们的实验结果验证了在各种最新姿势估计方法之上添加Posebert始终提高其性能,而其低计算成本使我们能够在实时演示中使用它,以通过A的机器人手使机器人手通过摄像头。可以在https://github.com/naver/posebert上获得测试代码和型号。
translated by 谷歌翻译