While deep learning has recently achieved great success on multi-view stereo (MVS), limited training data makes the trained model hard to be generalized to unseen scenarios. Compared with other computer vision tasks, it is rather difficult to collect a large-scale MVS dataset as it requires expensive active scanners and labor-intensive process to obtain ground truth 3D structures. In this paper, we introduce BlendedMVS, a novel large-scale dataset, to provide sufficient training ground truth for learning-based MVS. To create the dataset, we apply a 3D reconstruction pipeline to recover high-quality textured meshes from images of well-selected scenes. Then, we render these mesh models to color images and depth maps. To introduce the ambient lighting information during training, the rendered color images are further blended with the input images to generate the training input. Our dataset contains over 17k high-resolution images covering a variety of scenes, including cities, architectures, sculptures and small objects. Extensive experiments demonstrate that BlendedMVS endows the trained model with significantly better generalization ability compared with other MVS datasets. The dataset and pretrained models are available at https: //github.com/YoYo000/BlendedMVS.
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We present an end-to-end deep learning architecture for depth map inference from multi-view images. In the network, we first extract deep visual image features, and then build the 3D cost volume upon the reference camera frustum via the differentiable homography warping. Next, we apply 3D convolutions to regularize and regress the initial depth map, which is then refined with the reference image to generate the final output. Our framework flexibly adapts arbitrary N-view inputs using a variance-based cost metric that maps multiple features into one cost feature. The proposed MVSNet is demonstrated on the large-scale indoor DTU dataset. With simple post-processing, our method not only significantly outperforms previous state-of-the-arts, but also is several times faster in runtime. We also evaluate MVSNet on the complex outdoor Tanks and Temples dataset, where our method ranks first before April 18, 2018 without any fine-tuning, showing the strong generalization ability of MVSNet.
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Deep learning has recently demonstrated its excellent performance for multi-view stereo (MVS). However, one major limitation of current learned MVS approaches is the scalability: the memory-consuming cost volume regularization makes the learned MVS hard to be applied to highresolution scenes. In this paper, we introduce a scalable multi-view stereo framework based on the recurrent neural network. Instead of regularizing the entire 3D cost volume in one go, the proposed Recurrent Multi-view Stereo Network (R-MVSNet) sequentially regularizes the 2D cost maps along the depth direction via the gated recurrent unit (GRU). This reduces dramatically the memory consumption and makes high-resolution reconstruction feasible. We first show the state-of-the-art performance achieved by the proposed R-MVSNet on the recent MVS benchmarks. Then, we further demonstrate the scalability of the proposed method on several large-scale scenarios, where previous learned approaches often fail due to the memory constraint. Code is available at https://github.com/ YoYo000/MVSNet.
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在不同观点之间找到准确的对应关系是无监督的多视图立体声(MVS)的跟腱。现有方法是基于以下假设:相应的像素具有相似的光度特征。但是,在实际场景中,多视图图像观察到非斜面的表面和经验遮挡。在这项工作中,我们提出了一种新颖的方法,即神经渲染(RC-MVSNET),以解决观点之间对应关系的歧义问题。具体而言,我们施加了一个深度渲染一致性损失,以限制靠近对象表面的几何特征以减轻遮挡。同时,我们引入了参考视图综合损失,以产生一致的监督,即使是针对非兰伯特表面。关于DTU和TANKS \&Temples基准测试的广泛实验表明,我们的RC-MVSNET方法在无监督的MVS框架上实现了最先进的性能,并对许多有监督的方法进行了竞争性能。该代码在https://github.com/上发布。 BOESE0601/RC-MVSNET
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我们提出了Diffustereo,这是一种仅使用稀疏相机(在这项工作中8)进行高质量3D人类重建的新型系统。其核心是一种新型基于扩散的立体声模块,该模块将扩散模型(一种强大的生成模型)引入迭代立体声匹配网络中。为此,我们设计了一个新的扩散内核和其他立体限制,以促进网络中的立体声匹配和深度估计。我们进一步提出了一个多级立体声网络体系结构,以处理高分辨率(最多4K)输入,而无需无法负担的内存足迹。考虑到人类的一组稀疏视图颜色图像,提出的基于多级扩散的立体声网络可以产生高准确的深度图,然后通过有效的多视图融合策略将其转换为高质量的3D人类模型。总体而言,我们的方法可以自动重建人类模型,其质量是高端密集摄像头钻机,这是使用更轻巧的硬件设置来实现的。实验表明,我们的方法在定性和定量上都优于最先进的方法。
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在简单的数据集中,在简单的数据集中开发和广泛地进行了深度多视图立体声(MVS)方法,在那里他们现在优于经典方法。在本文中,我们询问控制方案中达到的结论是否仍然有效,在使用互联网照片集合时仍然有效。我们提出了一种评估方法,探讨了深度MVS方法的三个方面的影响:网络架构,培训数据和监督。我们进行了几个关键观察,我们广泛地定量和定性地验证,无论是深度预测和完整的3D重建。首先,复杂的无监督方法无法在野外训练数据。我们的新方法使三个关键要素成为可能:上采样输出,基于Softmin的聚合和单一的重建损失。其次,监督基于深度堤map的MVS方法是用于重建几个互联网图像的最新技术。最后,我们的评估提供了比通常的结果非常不同。这表明在不受控制的方案中的评估对于新架构很重要。
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尽管通过自学意识到,基于多层感知的方法在形状和颜色恢复方面取得了令人鼓舞的结果,但在学习深层隐式表面表示方面通常会遭受沉重的计算成本。由于渲染每个像素需要一个向前的网络推断,因此合成整个图像是非常密集的。为了应对这些挑战,我们提出了一种有效的粗到精细方法,以从本文中从多视图中恢复纹理网格。具体而言,采用可区分的泊松求解器来表示对象的形状,该求解器能够产生拓扑 - 敏捷和水密表面。为了说明深度信息,我们通过最小化渲染网格与多视图立体声预测深度之间的差异来优化形状几何形状。与形状和颜色的隐式神经表示相反,我们引入了一种基于物理的逆渲染方案,以共同估计环境照明和对象的反射率,该方案能够实时呈现高分辨率图像。重建的网格的质地是从可学习的密集纹理网格中插值的。我们已经对几个多视图立体数据集进行了广泛的实验,其有希望的结果证明了我们提出的方法的功效。该代码可在https://github.com/l1346792580123/diff上找到。
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近年来,与传统方法相比,受监督或无监督的基于学习的MVS方法的性能出色。但是,这些方法仅使用成本量正规化计算的概率量来预测参考深度,这种方式无法从概率量中挖掘出足够的信息。此外,无监督的方法通常尝试使用两步或其他输入进行训练,从而使过程更加复杂。在本文中,我们提出了DS-MVSNET,这是一种具有源深度合成的端到端无监督的MVS结构。为了挖掘概率量的信息,我们通过将概率量和深度假设推向源视图来创造性地综合源深度。同时,我们提出了自适应高斯采样和改进的自适应垃圾箱采样方法,以改善深度假设精度。另一方面,我们利用源深度渲染参考图像,并提出深度一致性损失和深度平滑度损失。这些可以根据不同视图的光度和几何一致性提供其他指导,而无需其他输入。最后,我们在DTU数据集和储罐数据集上进行了一系列实验,这些实验证明了与最先进的方法相比,DS-MVSNET的效率和鲁棒性。
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With the success of neural volume rendering in novel view synthesis, neural implicit reconstruction with volume rendering has become popular. However, most methods optimize per-scene functions and are unable to generalize to novel scenes. We introduce VolRecon, a generalizable implicit reconstruction method with Signed Ray Distance Function (SRDF). To reconstruct with fine details and little noise, we combine projection features, aggregated from multi-view features with a view transformer, and volume features interpolated from a coarse global feature volume. A ray transformer computes SRDF values of all the samples along a ray to estimate the surface location, which are used for volume rendering of color and depth. Extensive experiments on DTU and ETH3D demonstrate the effectiveness and generalization ability of our method. On DTU, our method outperforms SparseNeuS by about 30% in sparse view reconstruction and achieves comparable quality as MVSNet in full view reconstruction. Besides, our method shows good generalization ability on the large-scale ETH3D benchmark. Project page: https://fangjinhuawang.github.io/VolRecon.
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Image dehazing is one of the important and popular topics in computer vision and machine learning. A reliable real-time dehazing method with reliable performance is highly desired for many applications such as autonomous driving, security surveillance, etc. While recent learning-based methods require datasets containing pairs of hazy images and clean ground truth, it is impossible to capture them in real scenes. Many existing works compromise this difficulty to generate hazy images by rendering the haze from depth on common RGBD datasets using the haze imaging model. However, there is still a gap between the synthetic datasets and real hazy images as large datasets with high-quality depth are mostly indoor and depth maps for outdoor are imprecise. In this paper, we complement the existing datasets with a new, large, and diverse dehazing dataset containing real outdoor scenes from High-Definition (HD) 3D movies. We select a large number of high-quality frames of real outdoor scenes and render haze on them using depth from stereo. Our dataset is clearly more realistic and more diversified with better visual quality than existing ones. More importantly, we demonstrate that using this dataset greatly improves the dehazing performance on real scenes. In addition to the dataset, we also evaluate a series state of the art methods on the proposed benchmarking datasets.
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We present a learnt system for multi-view stereopsis. In contrast to recent learning based methods for 3D reconstruction, we leverage the underlying 3D geometry of the problem through feature projection and unprojection along viewing rays. By formulating these operations in a differentiable manner, we are able to learn the system end-to-end for the task of metric 3D reconstruction. End-to-end learning allows us to jointly reason about shape priors while conforming to geometric constraints, enabling reconstruction from much fewer images (even a single image) than required by classical approaches as well as completion of unseen surfaces. We thoroughly evaluate our approach on the ShapeNet dataset and demonstrate the benefits over classical approaches and recent learning based methods.
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神经隐式表面已成为多视图3D重建的重要技术,但它们的准确性仍然有限。在本文中,我们认为这来自难以学习和呈现具有神经网络的高频纹理。因此,我们建议在不同视图中添加标准神经渲染优化直接照片一致性术语。直观地,我们优化隐式几何体,以便以一致的方式扭曲彼此的视图。我们证明,两个元素是这种方法成功的关键:(i)使用沿着每条光线的预测占用和3D点的预测占用和法线来翘曲整个补丁,并用稳健的结构相似度测量它们的相似性; (ii)以这种方式处理可见性和遮挡,使得不正确的扭曲不会给出太多的重要性,同时鼓励重建尽可能完整。我们评估了我们的方法,在标准的DTU和EPFL基准上被称为NeuralWarp,并表明它在两个数据集上以超过20%重建的艺术态度优于未经监督的隐式表面。
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在许多计算机视觉和图形应用程序中,从2D图像重建3D室内场景是一项重要任务。这项任务中的一个主要挑战是,典型的室内场景中的无纹理区域使现有方法难以产生令人满意的重建结果。我们提出了一种名为Neuris的新方法,以高质量地重建室内场景。 Neuris的关键思想是将估计的室内场景正常整合为神经渲染框架中的先验,以重建大型无纹理形状,并且重要的是,以适应性的方式进行此操作,以便重建不规则的形状,并具有很好的细节。 。具体而言,我们通过检查优化过程中重建的多视图一致性来评估正常先验的忠诚。只有被接受为忠实的正常先验才能用于3D重建,通常发生在平滑形状的区域中,可能具有弱质地。但是,对于那些具有小物体或薄结构的区域,普通先验通常不可靠,我们只能依靠输入图像的视觉特征,因为此类区域通常包含相对较丰富的视觉特征(例如,阴影变化和边界轮廓)。广泛的实验表明,在重建质量方面,Neuris明显优于最先进的方法。
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精确地重建由单个图像的各种姿势和服装引起的精确复杂的人类几何形状非常具有挑战性。最近,基于像素对齐的隐式函数(PIFU)的作品已迈出了一步,并在基于图像的3D人数数字化上实现了最先进的保真度。但是,PIFU的培训在很大程度上取决于昂贵且有限的3D地面真相数据(即合成数据),从而阻碍了其对更多样化的现实世界图像的概括。在这项工作中,我们提出了一个名为selfpifu的端到端自我监督的网络,以利用丰富和多样化的野外图像,在对无约束的内部图像进行测试时,在很大程度上改善了重建。 SelfPifu的核心是深度引导的体积/表面感知的签名距离领域(SDF)学习,它可以自欺欺人地学习PIFU,而无需访问GT网格。整个框架由普通估计器,深度估计器和基于SDF的PIFU组成,并在训练过程中更好地利用了额外的深度GT。广泛的实验证明了我们自我监督框架的有效性以及使用深度作为输入的优越性。在合成数据上,与PIFUHD相比,我们的交叉点(IOU)达到93.5%,高18%。对于野外图像,我们对重建结果进行用户研究,与其他最先进的方法相比,我们的结果的选择率超过68%。
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基于图像的3D重建是计算机视觉中最重要的任务之一,在过去的几十年中提出了许多解决方案。目的是从图像直接提取场景对象的几何形状。然后可以将它们用于广泛的应用程序,例如电影,游戏,虚拟现实等。最近,已经提出了深度学习技术来解决这个问题。他们依靠对大量数据进行培训,以学会通过深层卷积神经网络在图像之间关联特征,并已被证明超过了传统的程序技术。在本文中,我们通过合并4D相关量来改进[11]的最新两视频结构(SFM)方法,以进行更准确的特征匹配和重建。此外,我们将其扩展到一般的多视图案例,并在复杂的基准数据集DTU [4]上对其进行评估。定量评估和与最先进的多视图3D重建方法的比较证明了其在重建的准确性方面的优势。
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我们介绍了Amazon Berkeley对象(ABO),这是一个新的大型数据集,旨在帮助弥合真实和虚拟3D世界之间的差距。ABO包含产品目录图像,元数据和艺术家创建的3D模型,具有复杂的几何形状和与真实的家用物体相对应的物理基础材料。我们得出了具有挑战性的基准,这些基准利用ABO的独特属性,并测量最先进的对象在三个开放问题上的最新限制,以了解实际3D对象:单视3D 3D重建,材料估计和跨域多视图对象检索。
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We present a novel neural surface reconstruction method called NeuralRoom for reconstructing room-sized indoor scenes directly from a set of 2D images. Recently, implicit neural representations have become a promising way to reconstruct surfaces from multiview images due to their high-quality results and simplicity. However, implicit neural representations usually cannot reconstruct indoor scenes well because they suffer severe shape-radiance ambiguity. We assume that the indoor scene consists of texture-rich and flat texture-less regions. In texture-rich regions, the multiview stereo can obtain accurate results. In the flat area, normal estimation networks usually obtain a good normal estimation. Based on the above observations, we reduce the possible spatial variation range of implicit neural surfaces by reliable geometric priors to alleviate shape-radiance ambiguity. Specifically, we use multiview stereo results to limit the NeuralRoom optimization space and then use reliable geometric priors to guide NeuralRoom training. Then the NeuralRoom would produce a neural scene representation that can render an image consistent with the input training images. In addition, we propose a smoothing method called perturbation-residual restrictions to improve the accuracy and completeness of the flat region, which assumes that the sampling points in a local surface should have the same normal and similar distance to the observation center. Experiments on the ScanNet dataset show that our method can reconstruct the texture-less area of indoor scenes while maintaining the accuracy of detail. We also apply NeuralRoom to more advanced multiview reconstruction algorithms and significantly improve their reconstruction quality.
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在本文中,我们串联串联一个实时单手抄语和密集的测绘框架。对于姿势估计,串联基于关键帧的滑动窗口执行光度束调整。为了增加稳健性,我们提出了一种新颖的跟踪前端,使用从全局模型中呈现的深度图来执行密集的直接图像对齐,该模型从密集的深度预测逐渐构建。为了预测密集的深度映射,我们提出了通过分层构造具有自适应视图聚合的3D成本卷来平衡关键帧之间的不同立体声基线的3D成本卷来使用整个活动密钥帧窗口的级联视图 - 聚合MVSNet(CVA-MVSNET)。最后,将预测的深度映射融合到表示为截短的符号距离函数(TSDF)体素网格的一致的全局映射中。我们的实验结果表明,在相机跟踪方面,串联优于其他最先进的传统和学习的单眼视觉径管(VO)方法。此外,串联示出了最先进的实时3D重建性能。
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球形摄像机以整体方式捕获场景,并已用于房间布局估计。最近,随着适当数据集的可用性,从单个全向图像中的深度估计也取得了进展。尽管这两个任务是互补的,但很少有作品能够并行探索它们以提高室内几何感知,而那些这样做的人则依靠合成数据或使用过的小型数据集,因为很少有选项可供选择,包括两个布局。在真实场景中的注释和密集的深度图。这部分是由于需要对房间布局进行手动注释。在这项工作中,我们超越了此限制,并生成360几何视觉(360V)数据集,该数据集包括多种模式,多视图立体声数据并自动生成弱布局提示。我们还探索了两个任务之间的明确耦合,以将它们集成到经过单打的训练模型中。我们依靠基于深度的布局重建和基于布局的深度注意,这表明了两项任务的性能提高。通过使用单个360摄像机扫描房间,出现了便利和快速建筑规模3D扫描的机会。
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我们呈现ITEMVS,一种用于高分辨率多视图立体声的新数据驱动方法。我们提出了一种基于GRU的基于GRU的估计器,其在其隐藏状态下编码深度的像素明显概率分布。摄入多尺度匹配信息,我们的模型将这些分布物流在多个迭代和Infers深度和信心上。要提取深度图,我们以新颖的方式结合传统的分类和回归。我们验证了我们对DTU,坦克和寺庙和ETH3D的方法的效率和有效性。虽然成为内存和运行时最有效的方法,但我们的模型在DTU和坦克和寺庙的更好的泛化能力方面取得了竞争性能,以及Eth3D而不是最先进的方法。代码可在https://github.com/fangjinhuawang/Itermvs获得。
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