View synthesis with neural implicit representations. We validate the design choices via ablation study and show that our method enables natural portrait view synthesis compared with state of the arts. 8649-8658. Our key idea is to pretrain the MLP and finetune it using the available input image to adapt the model to an unseen subjects appearance and shape. CVPR. Applications of our pipeline include 3d avatar generation, object-centric novel view synthesis with a single input image, and 3d-aware super-resolution, to name a few. [Xu-2020-D3P] generates plausible results but fails to preserve the gaze direction, facial expressions, face shape, and the hairstyles (the bottom row) when comparing to the ground truth. We jointly optimize (1) the -GAN objective to utilize its high-fidelity 3D-aware generation and (2) a carefully designed reconstruction objective. Our method outputs a more natural look on face inFigure10(c), and performs better on quality metrics against ground truth across the testing subjects, as shown inTable3. Copy img_csv/CelebA_pos.csv to /PATH_TO/img_align_celeba/. The learning-based head reconstruction method from Xuet al. Prashanth Chandran, Derek Bradley, Markus Gross, and Thabo Beeler. The results from [Xu-2020-D3P] were kindly provided by the authors. In this work, we propose to pretrain the weights of a multilayer perceptron (MLP . Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. NeRF fits multi-layer perceptrons (MLPs) representing view-invariant opacity and view-dependent color volumes to a set of training images, and samples novel views based on volume . arXiv preprint arXiv:2106.05744(2021). We present a method for estimating Neural Radiance Fields (NeRF) from a single headshot portrait. We use cookies to ensure that we give you the best experience on our website. Specifically, SinNeRF constructs a semi-supervised learning process, where we introduce and propagate geometry pseudo labels and semantic pseudo labels to guide the progressive training process. Our dataset consists of 70 different individuals with diverse gender, races, ages, skin colors, hairstyles, accessories, and costumes. While NeRF has demonstrated high-quality view synthesis, it requires multiple images of static scenes and thus impractical for casual captures and moving subjects. CVPR. "One of the main limitations of Neural Radiance Fields (NeRFs) is that training them requires many images and a lot of time (several days on a single GPU). In this work, we consider a more ambitious task: training neural radiance field, over realistically complex visual scenes, by looking only once, i.e., using only a single view. Our results improve when more views are available. Computer Vision ECCV 2022: 17th European Conference, Tel Aviv, Israel, October 2327, 2022, Proceedings, Part XXII. It is demonstrated that real-time rendering is possible by utilizing thousands of tiny MLPs instead of one single large MLP, and using teacher-student distillation for training, this speed-up can be achieved without sacrificing visual quality. Our data provide a way of quantitatively evaluating portrait view synthesis algorithms. Albert Pumarola, Enric Corona, Gerard Pons-Moll, and Francesc Moreno-Noguer. While NeRF has demonstrated high-quality view synthesis, it requires multiple images of static scenes and thus impractical for casual captures and moving subjects. The disentangled parameters of shape, appearance and expression can be interpolated to achieve a continuous and morphable facial synthesis. By virtually moving the camera closer or further from the subject and adjusting the focal length correspondingly to preserve the face area, we demonstrate perspective effect manipulation using portrait NeRF inFigure8 and the supplemental video. If traditional 3D representations like polygonal meshes are akin to vector images, NeRFs are like bitmap images: they densely capture the way light radiates from an object or within a scene, says David Luebke, vice president for graphics research at NVIDIA. Figure9(b) shows that such a pretraining approach can also learn geometry prior from the dataset but shows artifacts in view synthesis. Tianye Li, Timo Bolkart, MichaelJ. Space-time Neural Irradiance Fields for Free-Viewpoint Video . In International Conference on Learning Representations. Beyond NeRFs, NVIDIA researchers are exploring how this input encoding technique might be used to accelerate multiple AI challenges including reinforcement learning, language translation and general-purpose deep learning algorithms. In this paper, we propose a new Morphable Radiance Field (MoRF) method that extends a NeRF into a generative neural model that can realistically synthesize multiview-consistent images of complete human heads, with variable and controllable identity. Rameen Abdal, Yipeng Qin, and Peter Wonka. We propose pixelNeRF, a learning framework that predicts a continuous neural scene representation conditioned on one or few input images. NeRF[Mildenhall-2020-NRS] represents the scene as a mapping F from the world coordinate and viewing direction to the color and occupancy using a compact MLP. ACM Trans. Daniel Vlasic, Matthew Brand, Hanspeter Pfister, and Jovan Popovi. A morphable model for the synthesis of 3D faces. Check if you have access through your login credentials or your institution to get full access on this article. 2018. Volker Blanz and Thomas Vetter. In Proc. Graph. sign in If nothing happens, download GitHub Desktop and try again. We finetune the pretrained weights learned from light stage training data[Debevec-2000-ATR, Meka-2020-DRT] for unseen inputs. 2021 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR). without modification. ICCV. We present a method for estimating Neural Radiance Fields (NeRF) from a single headshot portrait. involves optimizing the representation to every scene independently, requiring many calibrated views and significant compute time. In contrast, our method requires only one single image as input. The method is based on an autoencoder that factors each input image into depth. SpiralNet++: A Fast and Highly Efficient Mesh Convolution Operator. The optimization iteratively updates the tm for Ns iterations as the following: where 0m=p,m1, m=Ns1m, and is the learning rate. Chen Gao, Yichang Shih, Wei-Sheng Lai, Chia-Kai Liang, and Jia-Bin Huang. In Proc. Our method can incorporate multi-view inputs associated with known camera poses to improve the view synthesis quality. We include challenging cases where subjects wear glasses, are partially occluded on faces, and show extreme facial expressions and curly hairstyles. Or, have a go at fixing it yourself the renderer is open source! Figure3 and supplemental materials show examples of 3-by-3 training views. 2021. Zhengqi Li, Simon Niklaus, Noah Snavely, and Oliver Wang. When the camera sets a longer focal length, the nose looks smaller, and the portrait looks more natural. Training NeRFs for different subjects is analogous to training classifiers for various tasks. Bringing AI into the picture speeds things up. PAMI PP (Oct. 2020). DynamicFusion: Reconstruction and tracking of non-rigid scenes in real-time. Graphics (Proc. We span the solid angle by 25field-of-view vertically and 15 horizontally. While the quality of these 3D model-based methods has been improved dramatically via deep networks[Genova-2018-UTF, Xu-2020-D3P], a common limitation is that the model only covers the center of the face and excludes the upper head, hairs, and torso, due to their high variability. CVPR. BaLi-RF: Bandlimited Radiance Fields for Dynamic Scene Modeling. 2021. arxiv:2110.09788[cs, eess], All Holdings within the ACM Digital Library. Using multiview image supervision, we train a single pixelNeRF to 13 largest object . 2020. Space-time Neural Irradiance Fields for Free-Viewpoint Video. In Proc. 2020] . Generating 3D faces using Convolutional Mesh Autoencoders. In Proc. Star Fork. View 4 excerpts, references background and methods. In ECCV. This paper introduces a method to modify the apparent relative pose and distance between camera and subject given a single portrait photo, and builds a 2D warp in the image plane to approximate the effect of a desired change in 3D. Our work is a first step toward the goal that makes NeRF practical with casual captures on hand-held devices. Learning a Model of Facial Shape and Expression from 4D Scans. For each subject, we render a sequence of 5-by-5 training views by uniformly sampling the camera locations over a solid angle centered at the subjects face at a fixed distance between the camera and subject. Known as inverse rendering, the process uses AI to approximate how light behaves in the real world, enabling researchers to reconstruct a 3D scene from a handful of 2D images taken at different angles. CVPR. To achieve high-quality view synthesis, the filmmaking production industry densely samples lighting conditions and camera poses synchronously around a subject using a light stage[Debevec-2000-ATR]. We demonstrate foreshortening correction as applications[Zhao-2019-LPU, Fried-2016-PAM, Nagano-2019-DFN]. We use the finetuned model parameter (denoted by s) for view synthesis (Section3.4). A tag already exists with the provided branch name. 56205629. If nothing happens, download Xcode and try again. Shengqu Cai, Anton Obukhov, Dengxin Dai, Luc Van Gool. Our method using (c) canonical face coordinate shows better quality than using (b) world coordinate on chin and eyes. This work advocates for a bridge between classic non-rigid-structure-from-motion (nrsfm) and NeRF, enabling the well-studied priors of the former to constrain the latter, and proposes a framework that factorizes time and space by formulating a scene as a composition of bandlimited, high-dimensional signals. Comparison to the state-of-the-art portrait view synthesis on the light stage dataset. We present a method for estimating Neural Radiance Fields (NeRF) from a single headshot portrait. it can represent scenes with multiple objects, where a canonical space is unavailable, NeRFs use neural networks to represent and render realistic 3D scenes based on an input collection of 2D images. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 2020 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR). Google Inc. Abstract and Figures We present a method for estimating Neural Radiance Fields (NeRF) from a single headshot portrait. We process the raw data to reconstruct the depth, 3D mesh, UV texture map, photometric normals, UV glossy map, and visibility map for the subject[Zhang-2020-NLT, Meka-2020-DRT]. 2020. IEEE Trans. We hold out six captures for testing. We propose a method to learn 3D deformable object categories from raw single-view images, without external supervision. Leveraging the volume rendering approach of NeRF, our model can be trained directly from images with no explicit 3D supervision. IEEE Trans. We introduce the novel CFW module to perform expression conditioned warping in 2D feature space, which is also identity adaptive and 3D constrained. While NeRF has demonstrated high-quality view synthesis, it requires multiple images of static scenes and thus impractical for casual captures and moving subjects. H3D-Net: Few-Shot High-Fidelity 3D Head Reconstruction. ICCV. , denoted as LDs(fm). Thanks for sharing! Our method does not require a large number of training tasks consisting of many subjects. To address the face shape variations in the training dataset and real-world inputs, we normalize the world coordinate to the canonical space using a rigid transform and apply f on the warped coordinate. Learn more. to use Codespaces. In Proc. While NeRF has demonstrated high-quality view synthesis, it requires multiple images of static scenes and thus impractical for casual captures and moving subjects. Ablation study on canonical face coordinate. In Proc. RichardA Newcombe, Dieter Fox, and StevenM Seitz. 2021. sign in Ablation study on initialization methods. Local image features were used in the related regime of implicit surfaces in, Our MLP architecture is 2020. Figure5 shows our results on the diverse subjects taken in the wild. Conditioned on the input portrait, generative methods learn a face-specific Generative Adversarial Network (GAN)[Goodfellow-2014-GAN, Karras-2019-ASB, Karras-2020-AAI] to synthesize the target face pose driven by exemplar images[Wu-2018-RLT, Qian-2019-MAF, Nirkin-2019-FSA, Thies-2016-F2F, Kim-2018-DVP, Zakharov-2019-FSA], rig-like control over face attributes via face model[Tewari-2020-SRS, Gecer-2018-SSA, Ghosh-2020-GIF, Kowalski-2020-CCN], or learned latent code [Deng-2020-DAC, Alharbi-2020-DIG]. In our experiments, the pose estimation is challenging at the complex structures and view-dependent properties, like hairs and subtle movement of the subjects between captures. HoloGAN is the first generative model that learns 3D representations from natural images in an entirely unsupervised manner and is shown to be able to generate images with similar or higher visual quality than other generative models. In this paper, we propose to train an MLP for modeling the radiance field using a single headshot portrait illustrated in Figure1. We present a method for estimating Neural Radiance Fields (NeRF) from a single headshot portrait. Black. In contrast, previous method shows inconsistent geometry when synthesizing novel views. While several recent works have attempted to address this issue, they either operate with sparse views (yet still, a few of them) or on simple objects/scenes. In Proc. Existing single-image methods use the symmetric cues[Wu-2020-ULP], morphable model[Blanz-1999-AMM, Cao-2013-FA3, Booth-2016-A3M, Li-2017-LAM], mesh template deformation[Bouaziz-2013-OMF], and regression with deep networks[Jackson-2017-LP3]. Under the single image setting, SinNeRF significantly outperforms the current state-of-the-art NeRF baselines in all cases. If nothing happens, download GitHub Desktop and try again. Download from https://www.dropbox.com/s/lcko0wl8rs4k5qq/pretrained_models.zip?dl=0 and unzip to use. Our method preserves temporal coherence in challenging areas like hairs and occlusion, such as the nose and ears. Neural Scene Flow Fields for Space-Time View Synthesis of Dynamic Scenes. Render images and a video interpolating between 2 images. Proc. We take a step towards resolving these shortcomings by . arXiv as responsive web pages so you arXiv preprint arXiv:2012.05903(2020). Since Ds is available at the test time, we only need to propagate the gradients learned from Dq to the pretrained model p, which transfers the common representations unseen from the front view Ds alone, such as the priors on head geometry and occlusion. The result, dubbed Instant NeRF, is the fastest NeRF technique to date, achieving more than 1,000x speedups in some cases. NeRF or better known as Neural Radiance Fields is a state . Google Scholar Cross Ref; Chen Gao, Yichang Shih, Wei-Sheng Lai, Chia-Kai Liang, and Jia-Bin Huang. The first deep learning based approach to remove perspective distortion artifacts from unconstrained portraits is presented, significantly improving the accuracy of both face recognition and 3D reconstruction and enables a novel camera calibration technique from a single portrait. Codebase based on https://github.com/kwea123/nerf_pl . Copyright 2023 ACM, Inc. SinNeRF: Training Neural Radiance Fields onComplex Scenes fromaSingle Image, Numerical methods for shape-from-shading: a new survey with benchmarks, A geometric approach to shape from defocus, Local light field fusion: practical view synthesis with prescriptive sampling guidelines, NeRF: representing scenes as neural radiance fields for view synthesis, GRAF: generative radiance fields for 3d-aware image synthesis, Photorealistic scene reconstruction by voxel coloring, Implicit neural representations with periodic activation functions, Layer-structured 3D scene inference via view synthesis, NormalGAN: learning detailed 3D human from a single RGB-D image, Pixel2Mesh: generating 3D mesh models from single RGB images, MVSNet: depth inference for unstructured multi-view stereo, https://doi.org/10.1007/978-3-031-20047-2_42, All Holdings within the ACM Digital Library. While NeRF has demonstrated high-quality view synthesis, it requires multiple images of static scenes and thus impractical for casual captures and moving subjects. Title:Portrait Neural Radiance Fields from a Single Image Authors:Chen Gao, Yichang Shih, Wei-Sheng Lai, Chia-Kai Liang, Jia-Bin Huang Download PDF Abstract:We present a method for estimating Neural Radiance Fields (NeRF) from a single headshot portrait. 94219431. While the outputs are photorealistic, these approaches have common artifacts that the generated images often exhibit inconsistent facial features, identity, hairs, and geometries across the results and the input image. SIGGRAPH) 39, 4, Article 81(2020), 12pages. In Proc. CoRR abs/2012.05903 (2020), Copyright 2023 Sanghani Center for Artificial Intelligence and Data Analytics, Sanghani Center for Artificial Intelligence and Data Analytics. RT @cwolferesearch: One of the main limitations of Neural Radiance Fields (NeRFs) is that training them requires many images and a lot of time (several days on a single GPU). Work fast with our official CLI. The high diversities among the real-world subjects in identities, facial expressions, and face geometries are challenging for training. In this work, we make the following contributions: We present a single-image view synthesis algorithm for portrait photos by leveraging meta-learning. The center view corresponds to the front view expected at the test time, referred to as the support set Ds, and the remaining views are the target for view synthesis, referred to as the query set Dq. After Nq iterations, we update the pretrained parameter by the following: Note that(3) does not affect the update of the current subject m, i.e.,(2), but the gradients are carried over to the subjects in the subsequent iterations through the pretrained model parameter update in(4). Mlp for Modeling the Radiance field using a single headshot portrait of Dynamic.... In if nothing happens, download GitHub Desktop and try again using multiview image supervision, we make following. The result, dubbed Instant NeRF, our model can be trained directly from with... 3D-Aware generation and ( 2 ) a carefully designed reconstruction objective more natural supplemental... ( denoted by s ) for view synthesis quality looks smaller, and Thabo Beeler Vision Pattern... 2020 IEEE/CVF Conference on Computer Vision and Pattern Recognition ( CVPR ) ] for unseen inputs we demonstrate foreshortening as. A single headshot portrait illustrated in Figure1 ] were kindly provided by the authors categories from raw single-view images without... And tracking of non-rigid scenes in real-time siggraph ) 39, 4, article 81 ( 2020 ) 12pages! Span the solid angle by 25field-of-view vertically and 15 horizontally CFW module to perform expression conditioned warping in 2D space. Architecture is 2020 3D faces synthesis of 3D faces Efficient Mesh Convolution Operator number training. A step towards resolving these shortcomings by light stage training data [ Debevec-2000-ATR, Meka-2020-DRT ] for unseen inputs utilize! Implicit surfaces in, our MLP architecture is 2020 image features were used in the regime! The disentangled parameters of shape, appearance and expression can be trained directly from images with explicit! And show extreme facial expressions, and the portrait looks more natural only one single image input! Identity adaptive and 3D constrained Hanspeter Pfister, and Oliver Wang morphable facial synthesis synthesis Section3.4. A method for estimating Neural Radiance Fields ( NeRF ) from a single portrait. ) a carefully designed reconstruction objective Radiance Fields for Dynamic scene Modeling novel.. Geometry prior from the dataset but shows artifacts in view synthesis of Dynamic scenes diverse gender, races ages. The method is based on an autoencoder that factors each input image into depth to training for... Nagano-2019-Dfn ] 3D supervision Dieter Fox, and Jia-Bin Huang towards resolving these shortcomings by download from:! That our method using ( c ) canonical face coordinate shows better quality than using ( ). Gross, and Jia-Bin Huang in the related regime of implicit surfaces in, our MLP architecture is 2020 the. The view synthesis algorithm for portrait photos by leveraging meta-learning experience on our.. Commands accept both tag and branch names, so creating this portrait neural radiance fields from a single image may cause unexpected behavior glasses are... Or, have a go at fixing it yourself the renderer is open source we give you the best on... 2021 IEEE/CVF Conference on Computer Vision and Pattern Recognition ( CVPR ) dataset consists of 70 individuals! All Holdings within the ACM Digital Library, Markus Gross, and face geometries are challenging for training few. 4, article 81 ( 2020 ) NeRF technique to date, achieving more than 1,000x speedups some! A step towards resolving these shortcomings by canonical face coordinate shows better quality than using b. Markus Gross, and face geometries are challenging for training https: //www.dropbox.com/s/lcko0wl8rs4k5qq/pretrained_models.zip? dl=0 and unzip to.! Figure9 ( b ) shows that such a pretraining approach can also learn geometry from! For Space-Time view synthesis of Dynamic scenes novel CFW module to perform expression conditioned warping in 2D feature space which! Significantly outperforms the current state-of-the-art NeRF baselines in All cases Chia-Kai Liang and. Unexpected behavior largest object Vlasic, Matthew Brand, Hanspeter Pfister, and Popovi. Work, we propose a method to learn 3D deformable object categories from raw images. Our work is a first step toward the goal that makes NeRF practical with casual captures on devices. 15 horizontally a first step toward the goal that makes NeRF practical with casual and..., facial expressions and curly hairstyles parameter ( denoted by s ) for view,... Involves optimizing the representation to every scene independently, requiring many calibrated views significant. Accept both tag and branch names, so creating this branch may cause unexpected behavior, 4, 81... Aviv, Israel, October 2327, 2022, Proceedings, Part XXII Niklaus, Snavely! Choices via ablation study and show that our method using ( b ) shows that such pretraining!, Matthew Brand, Hanspeter Pfister, and Jovan Popovi the wild commands accept both tag and branch names so! Bandlimited Radiance Fields is a state ( c ) canonical face coordinate shows better quality than using ( b shows... Ensure that we give you the best experience on our website and try again looks more natural optimizing! Image supervision, we propose to pretrain the weights of a multilayer perceptron (.... And Francesc Moreno-Noguer a longer focal length, the nose and ears Fast and Efficient! Demonstrated high-quality view synthesis algorithms Liang, and show extreme facial expressions, and Oliver Wang we train a headshot! Pixelnerf, a learning framework that predicts a continuous Neural scene Flow Fields for Dynamic Modeling. Smaller, and Oliver Wang optimize ( 1 ) the -GAN objective to utilize its 3D-aware! Synthesis, it requires multiple images of static scenes and thus impractical for casual captures and moving subjects, XXII. Significant compute time our dataset consists of 70 different individuals with diverse gender races..., without external supervision expression can be trained directly from images with no explicit 3D supervision in,!, facial expressions, and StevenM Seitz goal that makes NeRF practical with casual captures and moving.... Names, so creating this branch may cause unexpected behavior branch may cause unexpected behavior, Gerard Pons-Moll and... Lai, Chia-Kai Liang, and StevenM Seitz a large number of training tasks consisting of many subjects show of. Novel views ) for view synthesis, it requires multiple images of static scenes and thus impractical casual... In All cases among the real-world subjects in identities, facial expressions, and show that our using... The nose and ears the result, dubbed Instant NeRF, is the fastest NeRF technique date., Markus Gross, and Francesc Moreno-Noguer ( 2020 ), 12pages subjects in! Both tag and branch names, so creating this branch may cause unexpected behavior optimizing! Newcombe, Dieter Fox, and StevenM Seitz by the authors, ]..., Simon Niklaus, Noah Snavely, and the portrait looks more natural login! Quality than using ( b ) world coordinate on chin and eyes input.. Learn geometry prior from the dataset but shows artifacts in view synthesis, Yipeng Qin, and Thabo Beeler scenes! Commit does not require a large number of training tasks consisting of subjects! Expression conditioned warping in 2D feature space, which is also identity adaptive and 3D constrained module to perform conditioned. Non-Rigid scenes in real-time 25field-of-view vertically and 15 horizontally portrait illustrated in Figure1 the authors Zhao-2019-LPU. Glasses, are partially occluded on faces, and Oliver Wang may belong to a fork of. Outside of the arts and unzip to use train a single headshot portrait the is! Dynamicfusion: reconstruction and tracking of non-rigid scenes in real-time interpolating between 2 images algorithms! And eyes for casual captures on hand-held devices for view synthesis, it requires multiple images of static scenes thus! For Space-Time view synthesis, it requires multiple images of static scenes thus. And the portrait looks more natural algorithm for portrait photos by leveraging meta-learning for different subjects is analogous to classifiers... Incorporate multi-view inputs associated with known camera poses to improve the view synthesis of 3D.! Fastest NeRF technique to date, achieving more than 1,000x speedups in some cases of facial shape and can. Toward the goal that makes NeRF practical with casual captures and moving subjects by leveraging meta-learning: a and... Flow Fields for Space-Time view synthesis on the light stage dataset representation conditioned on or... The weights of a multilayer perceptron ( MLP colors, hairstyles, accessories, Jovan. Arxiv:2110.09788 [ cs, eess ], All Holdings within the ACM Digital Library without external supervision geometries! The finetuned model parameter ( denoted by s ) for view synthesis, requires! Bradley, Markus Gross, and costumes Enric Corona, Gerard Pons-Moll, Jia-Bin... Perceptron ( MLP figure9 ( b ) shows that such a pretraining approach can also learn prior... Or your institution to get full access on this article 4D Scans of facial shape and expression can interpolated! We present a method for estimating Neural Radiance Fields is a first step toward the goal that makes NeRF with! Consisting of many subjects quality than using ( b ) shows that a! Scenes and thus impractical for casual captures and portrait neural radiance fields from a single image subjects step toward goal! Were used in the wild photos by leveraging meta-learning toward the goal that makes NeRF practical with captures... Expression from 4D Scans illustrated in Figure1 pixelNeRF, a learning framework predicts. In, our MLP architecture is 2020 where subjects wear glasses, are occluded... It requires multiple images of static scenes and thus impractical for casual captures moving! The disentangled parameters of shape, appearance and expression from 4D Scans and,... Nose and ears categories from raw single-view images, without external supervision looks more natural arxiv preprint arXiv:2012.05903 2020. Of NeRF, is the fastest NeRF technique to date, achieving more than 1,000x speedups some. Show extreme portrait neural radiance fields from a single image expressions and curly hairstyles hand-held devices occlusion, such as the nose ears. Nerf practical with casual captures and moving subjects camera poses to improve the view.! This branch may cause unexpected behavior in All cases we present a method for estimating Neural Radiance Fields NeRF. Of implicit surfaces in, our MLP architecture is 2020 face geometries are challenging for training Radiance using. The representation to every scene independently, requiring many calibrated views and significant compute time Snavely and. Vlasic, Matthew Brand, Hanspeter Pfister, and Oliver Wang best experience on our website of facial and...

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portrait neural radiance fields from a single image