Human modeling and relighting are two fundamental problems in computer vision and graphics, where high-quality datasets can largely facilitate related research. However, most existing human datasets only provide multi-view human images captured under the same illumination. Although valuable for modeling tasks, they are not readily used in relighting problems. To promote research in both fields, in this paper, we present UltraStage, a new 3D human dataset that contains more than 2K high-quality human assets captured under both multi-view and multi-illumination settings. Specifically, for each example, we provide 32 surrounding views illuminated with one white light and two gradient illuminations. In addition to regular multi-view images, gradient illuminations help recover detailed surface normal and spatially-varying material maps, enabling various relighting applications. Inspired by recent advances in neural representation, we further interpret each example into a neural human asset which allows novel view synthesis under arbitrary lighting conditions. We show our neural human assets can achieve extremely high capture performance and are capable of representing fine details such as facial wrinkles and cloth folds. We also validate UltraStage in single image relighting tasks, training neural networks with virtual relighted data from neural assets and demonstrating realistic rendering improvements over prior arts. UltraStage will be publicly available to the community to stimulate significant future developments in various human modeling and rendering tasks.
translated by 谷歌翻译
Humans constantly interact with objects in daily life tasks. Capturing such processes and subsequently conducting visual inferences from a fixed viewpoint suffers from occlusions, shape and texture ambiguities, motions, etc. To mitigate the problem, it is essential to build a training dataset that captures free-viewpoint interactions. We construct a dense multi-view dome to acquire a complex human object interaction dataset, named HODome, that consists of $\sim$75M frames on 10 subjects interacting with 23 objects. To process the HODome dataset, we develop NeuralDome, a layer-wise neural processing pipeline tailored for multi-view video inputs to conduct accurate tracking, geometry reconstruction and free-view rendering, for both human subjects and objects. Extensive experiments on the HODome dataset demonstrate the effectiveness of NeuralDome on a variety of inference, modeling, and rendering tasks. Both the dataset and the NeuralDome tools will be disseminated to the community for further development.
translated by 谷歌翻译
Depth estimation is usually ill-posed and ambiguous for monocular camera-based 3D multi-person pose estimation. Since LiDAR can capture accurate depth information in long-range scenes, it can benefit both the global localization of individuals and the 3D pose estimation by providing rich geometry features. Motivated by this, we propose a monocular camera and single LiDAR-based method for 3D multi-person pose estimation in large-scale scenes, which is easy to deploy and insensitive to light. Specifically, we design an effective fusion strategy to take advantage of multi-modal input data, including images and point cloud, and make full use of temporal information to guide the network to learn natural and coherent human motions. Without relying on any 3D pose annotations, our method exploits the inherent geometry constraints of point cloud for self-supervision and utilizes 2D keypoints on images for weak supervision. Extensive experiments on public datasets and our newly collected dataset demonstrate the superiority and generalization capability of our proposed method.
translated by 谷歌翻译
最近,我们看到了照片真实的人类建模和渲染的神经进展取得的巨大进展。但是,将它们集成到现有的下游应用程序中的现有网络管道中仍然具有挑战性。在本文中,我们提出了一种全面的神经方法,用于从密集的多视频视频中对人类表演进行高质量重建,压缩和渲染。我们的核心直觉是用一系列高效的神经技术桥接传统的动画网格工作流程。我们首先引入一个神经表面重建器,以在几分钟内进行高质量的表面产生。它与多分辨率哈希编码的截短签名距离场(TSDF)的隐式体积渲染相结合。我们进一步提出了一个混合神经跟踪器来生成动画网格,该网格将明确的非刚性跟踪与自我监督框架中的隐式动态变形结合在一起。前者将粗糙的翘曲返回到规范空间中,而后者隐含的一个隐含物进一步预测了使用4D哈希编码的位移,如我们的重建器中。然后,我们使用获得的动画网格讨论渲染方案,从动态纹理到各种带宽设置下的Lumigraph渲染。为了在质量和带宽之间取得复杂的平衡,我们通过首先渲染6个虚拟视图来涵盖表演者,然后进行闭塞感知的神经纹理融合,提出一个分层解决方案。我们证明了我们方法在各种平台上的各种基于网格的应用程序和照片真实的自由观看体验中的功效,即,通过移动AR插入虚拟人类的表演,或通过移动AR插入真实环境,或带有VR头戴式的人才表演。
translated by 谷歌翻译
位置识别是自动驾驶汽车实现循环结束或全球本地化的重要组成部分。在本文中,我们根据机上激光雷达传感器获得的顺序3D激光扫描解决了位置识别问题。我们提出了一个名为SEQOT的基于变压器的网络,以利用由LIDAR数据生成的顺序范围图像提供的时间和空间信息。它使用多尺度变压器以端到端的方式为每一个LiDAR范围图像生成一个全局描述符。在线操作期间,我们的SEQOT通过在当前查询序列和地图中存储的描述符之间匹配此类描述符来找到相似的位置。我们在不同类型的不同环境中使用不同类型的LIDAR传感器收集的四个数据集评估了我们的方法。实验结果表明,我们的方法优于最新的基于激光痛的位置识别方法,并在不同环境中概括了。此外,我们的方法比传感器的帧速率更快地在线运行。我们的方法的实现以开放源形式发布,网址为:https://github.com/bit-mjy/seqot。
translated by 谷歌翻译
近年来,由于其在数字人物,角色产生和动画中的广泛应用,人们对3D人脸建模的兴趣越来越大。现有方法压倒性地强调了对面部的外部形状,质地和皮肤特性建模,而忽略了内部骨骼结构和外观之间的固有相关性。在本文中,我们使用学习的参数面部发电机提出了雕塑家,具有骨骼一致性的3D面部创作,旨在通过混合参数形态表示轻松地创建解剖上正确和视觉上令人信服的面部模型。雕塑家的核心是露西(Lucy),这是与整形外科医生合作的第一个大型形状面部脸部数据集。我们的Lucy数据集以最古老的人类祖先之一的化石命名,其中包含正牙手术前后全人头的高质量计算机断层扫描(CT)扫描,这对于评估手术结果至关重要。露西(Lucy)由144次扫描,分别对72名受试者(31名男性和41名女性)组成,其中每个受试者进行了两次CT扫描,并在恐惧后手术中进行了两次CT扫描。根据我们的Lucy数据集,我们学习了一个新颖的骨骼一致的参数面部发电机雕塑家,它可以创建独特而细微的面部特征,以帮助定义角色,同时保持生理声音。我们的雕塑家通过将3D脸的描绘成形状混合形状,姿势混合形状和面部表达混合形状,共同在统一数据驱动的框架下共同建模头骨,面部几何形状和面部外观。与现有方法相比,雕塑家在面部生成任务中保留了解剖学正确性和视觉现实主义。最后,我们展示了雕塑家在以前看不见的各种花式应用中的鲁棒性和有效性。
translated by 谷歌翻译
基于深度学习的潜在表示已被广泛用于众多科学可视化应用,例如等法相似性分析,音量渲染,流场合成和数据减少,仅举几例。但是,现有的潜在表示主要以无监督的方式从原始数据生成,这使得很难合并域兴趣以控制潜在表示的大小和重建数据的质量。在本文中,我们提出了一种新颖的重要性驱动的潜在表示,以促进领域利益引导的科学数据可视化和分析。我们利用空间重要性图来代表各种科学利益,并将它们作为特征转化网络的输入来指导潜在的生成。我们通过与自动编码器一起训练的无损熵编码算法,进一步降低了潜在尺寸,从而提高了存储和存储效率。我们通过多个科学可视化应用程序的数据进行定性和定量评估我们方法产生的潜图的有效性和效率。
translated by 谷歌翻译
人际关系的阻塞和深度歧义使估计单眼多人的3D姿势是以摄像头为中心的坐标,这是一个具有挑战性的问题。典型的自上而下框架具有高计算冗余,并具有额外的检测阶段。相比之下,自下而上的方法的计算成本较低,因为它们受人数的影响较小。但是,大多数现有的自下而上方法将以摄像头3D为中心的人姿势估计视为两个无关的子任务:2.5D姿势估计和以相机为中心的深度估计。在本文中,我们提出了一个统一模型,该模型利用这两个子任务的相互益处。在框架内,稳健结构的2.5D姿势估计旨在基于深度关系识别人际遮挡。此外,我们开发了一种端到端几何感知的深度推理方法,该方法利用了2.5D姿势和以摄像头为中心的根深度的相互益处。该方法首先使用2.5D姿势和几何信息来推断向前通行证中以相机为中心的根深度,然后利用根深蒂固,以进一步改善向后通过的2.5D姿势估计的表示。此外,我们设计了一种自适应融合方案,该方案利用视觉感知和身体几何形状来减轻固有的深度歧义问题。广泛的实验证明了我们提出的模型比广泛的自下而上方法的优越性。我们的准确性甚至与自上而下的同行竞争。值得注意的是,我们的模型比现有的自下而上和自上而下的方法快得多。
translated by 谷歌翻译
在这项工作中,我们提出了叙述,这是一种新颖的管道,可以以逼真的方式同时编辑肖像照明和观点。作为一种混合神经形态的面部模型,叙述了几何学感知生成方法和正常辅助物理面部模型的互补益处。简而言之,叙述首先将输入肖像转变为粗糙的几何形状,并采用神经渲染来产生类似于输入的图像,并产生令人信服的姿势变化。但是,反演步骤引入了不匹配,带来了较少面部细节的低质量图像。因此,我们进一步估计了师范的肖像,以增强粗糙的几何形状,从而创建高保真的物理面部模型。特别是,我们融合了神经和身体渲染,以补偿不完善的反转,从而产生了现实和视图一致的新颖透视图像。在重新阶段,以前的作品着重于单一视图肖像重新审议,但也忽略了不同观点之间的一致性,引导不稳定和不一致的照明效果以进行视图变化。我们通过将其多视图输入正常地图与物理面部模型统一,以解决此问题。叙事通过一致的正常地图进行重新进行重新,施加了跨视图的约束并表现出稳定且连贯的照明效果。我们在实验上证明,叙述在先前的工作中取得了更现实的,可靠的结果。我们进一步使用动画和样式转移工具进行介绍,从而分别或组合姿势变化,灯光变化,面部动画和样式转移,所有这些都以摄影质量为单位。我们展示了生动的自由视图面部动画以及3D感知可靠的风格化,可帮助促进各种AR/VR应用程序,例如虚拟摄影,3D视频会议和后期制作。
translated by 谷歌翻译
We present TensoRF, a novel approach to model and reconstruct radiance fields. Unlike NeRF that purely uses MLPs, we model the radiance field of a scene as a 4D tensor, which represents a 3D voxel grid with per-voxel multi-channel features. Our central idea is to factorize the 4D scene tensor into multiple compact low-rank tensor components. We demonstrate that applying traditional CP decomposition -- that factorizes tensors into rank-one components with compact vectors -- in our framework leads to improvements over vanilla NeRF. To further boost performance, we introduce a novel vector-matrix (VM) decomposition that relaxes the low-rank constraints for two modes of a tensor and factorizes tensors into compact vector and matrix factors. Beyond superior rendering quality, our models with CP and VM decompositions lead to a significantly lower memory footprint in comparison to previous and concurrent works that directly optimize per-voxel features. Experimentally, we demonstrate that TensoRF with CP decomposition achieves fast reconstruction (<30 min) with better rendering quality and even a smaller model size (<4 MB) compared to NeRF. Moreover, TensoRF with VM decomposition further boosts rendering quality and outperforms previous state-of-the-art methods, while reducing the reconstruction time (<10 min) and retaining a compact model size (<75 MB).
translated by 谷歌翻译