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SIFU: Side-view Conditioned Implicit Function for Real-world Usable Clothed Human Reconstruction

SIFU: Side-view Conditioned Implicit Function for Real-world...

引用

ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Zhang, Zechuan Yang, Zongxin Yang, Yi Zhejiang Univ CCAL ReLER Hangzhou Peoples R China

ISBN: (纸本)9798350353006

Creating high-quality 3D models of clothed humans from single images for real-world applications is crucial. Despite recent advancements, accurately reconstructing humans in complex poses or with loose clothing from in-the-wild images, along with predicting textures for unseen areas, remains a significant challenge. A key limitation of previous methods is their insufficient prior guidance in transitioning from 2D to 3D and in texture prediction. In response, we introduce SIFU (Side-view Conditioned Implicit Function for Real-world Usable Clothed Human Reconstruction), a novel approach combining a Side-view Decoupling Transformer with a 3D Consistent Texture Refinement pipeline. SIFU employs a cross-attention mechanism within the transformer, using SMPL-X normals as queries to effectively decouple side-view features in the process of mapping 2D features to 3D. This method not only improves the precision of the 3D models but also their robustness, especially when SMPL-X estimates are not perfect. Our texture refinement process leverages text-to-image diffusion-based prior to generate realistic and consistent textures for invisible views. Through extensive experiments, SIFU surpasses SOTA methods in both geometry and texture reconstruction, showcasing enhanced robustness in com-lex scenarios and achieving an unprecedented Chamfer and P2S measurement. Our approach extends to practical applications such as 3D printing and scene building, demonstrating its broad utility in real-world scenarios.

关键词： 3D reconstruction 3D vision Clothed human diffusion model single image to 3D

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3DGStream: On-the-Fly Training of 3D Gaussians for Efficient Streaming of Photo-Realistic Free-Viewpoint Videos

3DGStream: On-the-Fly Training of 3D Gaussians for Efficient...

引用

ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Sun, Jiakai Jiao, Han Li, Guangyuan Zhang, Zhanjie Zhao, Lei Xing, Wei Zhejiang Univ Hangzhou Peoples R China

ISBN: (纸本)9798350353006

Constructing photo-realistic Free-Viewpoint Videos ( FVVs) of dynamic scenes from multi-view videos remains a challenging endeavor. Despite the remarkable advance-ments achieved by current neural rendering techniques, these methods generally require complete video sequences for offline training and are not capable of real-time render-ing. To address these constraints, we introduce 3DGStream, a method designed for efficient FVV streaming of real-world dynamic scenes. Our method achieves fast on-the-fly per-frame reconstruction within 12 seconds and real-time rendering at 200 FPS. Specifically, we utilize 3D Gaussians ( 3DGs) to represent the scene. Instead of the naive ap-proach of directly optimizing 3DGs per-frame, we employ a compact Neural Transformation Cache (NTC) to model the translations and rotations of 3DGs, markedly reducing the training time and storage required for each FVV frame. Furthermore, we propose an adaptive 3DG addition strat-egy to handle emerging objects in dynamic scenes. Exper-iments demonstrate that 3DGStream achieves competitive performance in terms of rendering speed, image quality, training time, and model storage when compared with state-of-the-art methods.

关键词： 3D Gaussian Splatting 3D vision Dynamic Scene Reconstruction Free-Viewpoint Video Streaming Media

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HRVDA: High-Resolution Visual Document Assistant

HRVDA: High-Resolution Visual Document Assistant

引用

ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Liu, Chaohu Yin, Kun Cao, Haoyu Jiang, Xinghua Li, Xin Liu, Yinsong Jiang, Deqiang Sun, Xing Xu, Linli Univ Sci & Technol China Sch Comp Sci & Technol Hefei Anhui Peoples R China State Key Lab Cognit Intelligence Hefei Anhui Peoples R China Tencent YouTu Lab Shanghai Peoples R China

ISBN: (纸本)9798350353006

Leveraging vast training data, multimodal large language models (MLLMs) have demonstrated formidable general visual comprehension capabilities and achieved remarkable performance across various tasks. However, their performance in visual document understanding still leaves much room for improvement. This discrepancy is primarily attributed to the fact that visual document understanding is a fine-grained prediction task. In natural scenes, MLLMs typically use low-resolution images, leading to a substantial loss of visual information. Furthermore, general-purpose MLLMs do not excel in handling document-oriented instructions. In this paper, we propose a High-Resolution Visual Document Assistant (HRVDA), which bridges the gap between MLLMs and visual document understanding. This model employs a content filtering mechanism and an instruction filtering module to separately filter out the content-agnostic visual tokens and instruction-agnostic visual tokens, thereby achieving efficient model training and inference for high-resolution images. In addition, we construct a document-oriented visual instruction tuning dataset and apply a multi-stage training strategy to enhance the model's document modeling capabilities. Extensive experiments demonstrate that our model achieves state-of-the-art performance across multiple document understanding datasets, while maintaining training efficiency and inference speed comparable to low-resolution models.

关键词： Document understanding Multimodal vision-language model

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OmniSeg3D: Omniversal 3D Segmentation via Hierarchical Contrastive Learning

OmniSeg3D: Omniversal 3D Segmentation via Hierarchical Contr...

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ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Ying, Haiyang Yin, Yixuan Zhang, Jinzhi Wang, Fan Yu, Tao Huang, Ruqi Fang, Lu Tsinghua Univ Beijing Peoples R China Alibaba Grp Beijing Peoples R China

ISBN: (纸本)9798350353006

Towards holistic understanding of 3D scenes, a general 3D segmentation method is needed that can segment diverse objects without restrictions on object quantity or categories, while also reflecting the inherent hierarchical structure. To achieve this, we propose OmniSeg3D, an omniversal segmentation method aims for segmenting anything in 3D all at once. The key insight is to lift multi-view inconsistent 2D segmentations into a consistent 3D feature field through a hierarchical contrastive learning framework, which is accomplished by two steps. Firstly, we design a novel hierarchical representation based on category-agnostic 2D segmentations to model the multi-level relationship among pixels. Secondly, image features rendered from the 3D feature field are clustered at different levels, which can be further drawn closer or pushed apart according to the hierarchical relationship between different levels. In tackling the challenges posed by inconsistent 2D segmentations, this framework yields a global consistent 3D feature field, which further enables hierarchical segmentation, multi-object selection, and global discretization. Extensive experiments demonstrate the effectiveness of our method on high-quality 3D segmentation and accurate hierarchical structure understanding. A graphical user interface further facilitates flexible interaction for omniversal 3D segmentation.

关键词： 3D Segmentation 3D vision Contrastive Learning Differentiable Rendering Hierarchical Understanding Neural Radiance Field

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Key Point-Based Driver Activity recognition

Key Point-Based Driver Activity Recognition

引用

ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Vats, Arpita Anastasiu, David C. Santa Clara Univ Santa Clara CA 95053 USA

ISBN: (数字)9781665487399

ISBN: (纸本)9781665487399

We present a key point-based activity recognition framework, built upon pre-trained human pose estimation and facial feature detection models. Our method extracts complex static and movement-based features from key frames in videos, which are used to predict a sequence of key-frame activities. Finally, a merge procedure is employed to identify robust activity segments while ignoring outlier frame activity predictions. We analyze the different components of our framework via a wide array of experiments and draw conclusions with regards to the utility of the model and ways it can be improved. Results show our model is competitive, taking the 11th place out of 27 teams submitting to Track 3 of the 2022 AI City Challenge.

关键词： computer vision conferences Urban areas Pose estimation Activity recognition Predictive models Feature extraction

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Leveraging Cross-Modal Neighbor Representation for Improved CLIP Classification

Leveraging Cross-Modal Neighbor Representation for Improved ...

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ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Yi, Chao Ren, Lu Zhan, De-Chuan Ye, Han-Jia Nanjing Univ Natl Key Lab Novel Software Technol Nanjing Peoples R China Nanjing Univ Sch Artificial Intelligence Nanjing Peoples R China

ISBN: (纸本)9798350353006

CLIP showcases exceptional cross-modal matching capabilities due to its training on image-text contrastive learning tasks. However, without specific optimization for unimodal scenarios, its performance in single-modality feature extraction might be suboptimal. Despite this, some studies have directly used CLIP's image encoder for tasks like few-shot classification, introducing a misalignment between its pre-training objectives and feature extraction methods. This inconsistency can diminish the quality of the image's feature representation, adversely affecting CLIP's effectiveness in target tasks. In this paper, we view text features as precise neighbors of image features in CLIP's space and present a novel CrOss-moDal nEighbor Representation (CODER) based on the distance structure between images and their neighbor texts. This feature extraction method aligns better with CLIP's pre-training objectives, thereby fully leveraging CLIP's robust cross-modal capabilities. The key to construct a high-quality CODER lies in how to create a vast amount of high-quality and diverse texts to match with images. We introduce the Auto Text Generator (ATG) to automatically generate the required texts in a data-free and training-free manner. We apply CODER to CLIP's zero-shot and few-shot image classification tasks. Experiment results across various datasets and models confirm CODER's effectiveness. Code is available at: https://***/YCaigogogo/CVPR24-CODER.

关键词： Multimodal Learning vision-Language Model

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Teeth-SEG: An Efficient Instance Segmentation Framework for Orthodontic Treatment based on Multi-Scale Aggregation and Anthropic Prior Knowledge

Teeth-SEG: An Efficient Instance Segmentation Framework for ...

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ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Zou, Bo Wang, Shaofeng Liu, Hao Sun, Gaoyue Wang, Yajie Zuo, FeiFei Quan, Chengbin Zhaot, Youjian Tsinghua Univ Beijing Peoples R China Capital Med Univ Beijing Peoples R China Imperial Coll London London England LargeV Inc Beijing Peoples R China Tsinghua Univ Zhongguancun Lab Beijing Peoples R China

ISBN: (纸本)9798350353006

Teeth localization, segmentation, and labeling in 2D images have great potential in modern dentistry to enhance dental diagnostics, treatment planning, and population-based studies on oral health. However, general instance segmentation frameworks are incompetent due to 1) the subtle differences between some teeth' shapes ( e.g., maxillary first premolar and second premolar), 2) the teeth's position and shape variation across subjects, and 3) the presence of abnormalities in the dentition (e.g., caries and edentulism). To address these problems, we propose a ViT-based framework named TeethSEG, which consists of stacked Multi-Scale Aggregation (MSA) blocks and an Anthropic Prior Knowledge (APK) layer. Specifically, to compose the two modules, we design a unique permutation-based upscaler to ensure high efficiency while establishing clear segmentation boundaries with multi-head self/cross-gating layers to emphasize particular semantics meanwhile maintaining the divergence between token embeddings. Besides, we collect the first open-sourced intraoral image dataset IO150K, which comprises over 150k intraoral photos, and all photos are annotated by orthodontists using a human-machine hybrid algorithm. Experiments on IO150K demonstrate that our TeethSEG outperforms the state-of-the-art segmentation models on dental image segmentation.

关键词： Image Segmentation Intra-Oral Image Medical vision Teeth Segmentation

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360Loc: A Dataset and Benchmark for Omnidirectional Visual Localization with Cross-device Queries

360Loc: A Dataset and Benchmark for Omnidirectional Visual L...

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ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Huang, Huajian Liu, Changkun Zhu, Yipeng Cheng, Hui Braud, Tristan Yeung, Sai-Kit Hong Kong Univ Sci & Technol Hong Kong Peoples R China Sun Yat Sen Univ Guangzhou Peoples R China

ISBN: (纸本)9798350353006

Portable 360 degrees cameras are becoming a cheap and efficient tool to establish large visual databases. By capturing omnidirectional views of a scene, these cameras could expedite building environment models that are essential for visual localization. However, such an advantage is often overlooked due to the lack of valuable datasets. This paper introduces a new benchmark dataset, 360Loc, composed of 360 degrees images with ground truth poses for visual localization. We present a practical implementation of 360 degrees mapping combining 360 degrees images with lidar data to generate the ground truth 6DoF poses. 360Loc is the first dataset and benchmark that explores the challenge of cross-device visual positioning, involving 360 degrees reference frames, and query frames from pinhole, ultra-wide FoV fisheye, and 360 degrees cameras. We propose a virtual camera approach to generate lower-FoV query frames from 360 degrees images, which ensures a fair comparison of performance among different query types in visual localization tasks. We also extend this virtual camera approach to feature matching-based and pose regression-based methods to alleviate the performance loss caused by the cross-device domain gap, and evaluate its effectiveness against state-of-the-art baselines. We demonstrate that omnidirectional visual localization is more robust in challenging large-scale scenes with symmetries and repetitive structures. These results provide new insights into 360-camera mapping and omnidirectional visual localization with cross-device queries. Project Page and dataset: https://***/research/360Loc/.

关键词： omnidirectional vision visual lozalization

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Single-Model and Any-Modality for Video Object Tracking

Single-Model and Any-Modality for Video Object Tracking

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ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Wu, Zongwei Zheng, Jilai Ren, Xiangxuan Vasluianu, Florin-Alexandru Ma, Chao Paudel, Danda Pani Luc Van Gool Timofte, Radu Univ Wurzburg Comp Vision Lab CAIDAS & IFI Wurzburg Germany Shanghai Jiao Tong Univ AI Inst Shanghai Peoples R China Sofia Univ INSAIT Sofia Bulgaria Swiss Fed Inst Technol CVL Zurich Switzerland

ISBN: (纸本)9798350353006

In the realm of video object tracking, auxiliary modalities such as depth, thermal, or event data have emerged as valuable assets to complement the RGB trackers. In practice, most existing RGB trackers learn a single set of parameters to use them across datasets and applications. However, a similar single-model unification for multimodality tracking presents several challenges. These challenges stem from the inherent heterogeneity of inputs - each with modality-specific representations, the scarcity of multi-modal datasets, and the absence of all the modalities at all times. In this work, we introduce Un-Track, a Unified Tracker of a single set of parameters for any modality. To handle any modality, our method learns their common latent space through low-rank factorization and reconstruction techniques. More importantly, we use only the RGBX pairs to learn the common latent space. This unique shared representation seamlessly binds all modalities together, enabling effective unification and accommodating any missing modality, all within a single transformer-based architecture. Our Un-Track achieves +8.1 absolute F-score gain, on the DepthTrack dataset, by introducing only +2.14 (over 21.50) GFLOPs with +6.6M (over 93M) parameters, through a simple yet efficient prompting strategy. Extensive comparisons on five benchmark datasets with different modalities show that Un-Track surpasses both SOTA unified trackers and modality-specific counterparts, validating our effectiveness and practicality. The source code is publicly available at https:// github. com/ Zongwei97/ UnTrack.

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Variational Autoencoders for Generating Hyperspectral Imaging Honey Adulteration Data

Variational Autoencoders for Generating Hyperspectral Imagin...

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ieee/cvf conference on computer vision and pattern recognition (CVPR)

作者： Phillips, Tessa Abdulla, Waleed Univ Auckland Auckland New Zealand

ISBN: (数字)9781665487399

ISBN: (纸本)9781665487399

Honey fraud and adulteration are an increasing concern globally. Hyperspectral imaging and machine learning can detect adulterated honey within a known set of honey, where we have captured data at different sugar concentrations. Previous work in this area has used a minimal number of honey types, as sample preparation and data capture is a time-consuming process. This paper develops a new approach using variational autoencoders (VAEs) for generating adulterated honey data for unseen honey types. The results show that the binary adulteration detector can achieve on average 81.3% accuracy on unseen honey types by adding the generated data to the existing training data. Without including the generated data while training, the classifier can only achieve 44% on unseen honey types.

关键词： Training computer vision conferences Training data Machine learning Detectors pattern recognition

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