mtybilly/Instruct2DS huggingface dataset:
Infrared Adversarial Car Stickers
Authors: Yuqiu Liu, Zhanhao Hu, Jianmin Li, Xiaolin Hu Xiaopei Zhu
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Infrared physical adversarial examples are of great significance for studying the security of infrared AI systems that are widely used in our lives such as autonomous driving. Previous infrared physical attacks mainly focused on 2D infrared pedestrian detection which may not fully manifest its destructiveness to AI systems. In this work we propose a physical attack method against infrared detectors based on 3D modeling which is applied to a real car. The goal is to design a set of infrared adversarial stickers to make cars invisible to infrared detectors at various viewing angles distances and scenes. We build a 3D infrared car model with real infrared characteristics and propose an infrared adversarial pattern generation method based on 3D mesh shadow. We propose a 3D control points-based mesh smoothing algorithm and use a set of smoothness loss functions to enhance the smoothness of adversarial meshes and facilitate the sticker implementation. Besides We designed the aluminum stickers and conducted physical experiments on two real Mercedes-Benz A200L cars. Our adversarial stickers hid the cars from Faster RCNN an object detector at various viewing angles distances and scenes. The attack success rate (ASR) was 91.49% for real cars. In comparison the ASRs of random stickers and no sticker were only 6.21% and 0.66% respectively. In addition the ASRs of the designed stickers against six unseen object detectors such as YOLOv3 and Deformable DETR were between 73.35%-95.80% showing good transferability of the attack performance across detectors.
Sculpt3D: Multi-View Consistent Text-to-3D Generation with Sparse 3D Prior
Authors: Xiaofeng Yang, Fan Yang, Chengzeng Feng, Zhoujie Fu, Chuan-Sheng Foo, Guosheng Lin, Fayao Liu Cheng Chen
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Recent works on text-to-3d generation show that using only 2D diffusion supervision for 3D generation tends to produce results with inconsistent appearances (e.g. faces on the back view) and inaccurate shapes (e.g. animals with extra legs). Existing methods mainly address this issue by retraining diffusion models with images rendered from 3D data to ensure multi-view consistency while struggling to balance 2D generation quality with 3D consistency. In this paper we present a new framework Sculpt3D that equips the current pipeline with explicit injection of 3D priors from retrieved reference objects without re-training the 2D diffusion model. Specifically we demonstrate that high-quality and diverse 3D geometry can be guaranteed by keypoints supervision through a sparse ray sampling approach. Moreover to ensure accurate appearances of different views we further modulate the output of the 2D diffusion model to the correct patterns of the template views without altering the generated object's style. These two decoupled designs effectively harness 3D information from reference objects to generate 3D objects while preserving the generation quality of the 2D diffusion model. Extensive experiments show our method can largely improve the multi-view consistency while retaining fidelity and diversity.
FreeMan: Towards Benchmarking 3D Human Pose Estimation under Real-World Conditions
Authors: Fengyu Yang, Bingliang Li, Wenbo Gou, Danqi Yan, Ailing Zeng, Yijun Gao, Junle Wang, Yanqing Jing, Ruimao Zhang Jiong Wang
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Estimating the 3D structure of the human body from nat- ural scenes is a fundamental aspect of visual perception. 3D human pose estimation is a vital step in advancing fields like AIGC and human-robot interaction serving as a crucial tech- nique for understanding and interacting with human actions in real-world settings. However the current datasets often collected under single laboratory conditions using complex motion capture equipment and unvarying backgrounds are insufficient. The absence of datasets on variable conditions is stalling the progress of this crucial task. To facilitate the development of 3D pose estimation we present FreeMan the first large-scale multi-view dataset collected under the real- world conditions. FreeMan was captured by synchronizing 8 smartphones across diverse scenarios. It comprises 11M frames from 8000 sequences viewed from different perspec- tives. These sequences cover 40 subjects across 10 different scenarios each with varying lighting conditions. We have also established an semi-automated pipeline containing er- ror detection to reduce the workload of manual check and ensure precise annotation. We provide comprehensive eval- uation baselines for a range of tasks underlining the sig- nificant challenges posed by FreeMan. Further evaluations of standard indoor/outdoor human sensing datasets reveal that FreeMan offers robust representation transferability in real and complex scenes. FreeMan is publicly available at https://wangjiongw.github.io/freeman.
ScanFormer: Referring Expression Comprehension by Iteratively Scanning
Authors: Peihan Miao, Huanzhang Dou, Xi Li Wei Su
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Referring Expression Comprehension (REC) aims to localize the target objects specified by free-form natural language descriptions in images. While state-of-the-art methods achieve impressive performance they perform a dense perception of images which incorporates redundant visual regions unrelated to linguistic queries leading to additional computational overhead. This inspires us to explore a question: can we eliminate linguistic-irrelevant redundant visual regions to improve the efficiency of the model? Existing relevant methods primarily focus on fundamental visual tasks with limited exploration in vision-language fields. To address this we propose a coarse-to-fine iterative perception framework called ScanFormer. It can iteratively exploit the image scale pyramid to extract linguistic-relevant visual patches from top to bottom. In each iteration irrelevant patches are discarded by our designed informativeness prediction. Furthermore we propose a patch selection strategy for discarded patches to accelerate inference. Experiments on widely used datasets namely RefCOCO RefCOCO+ RefCOCOg and ReferItGame verify the effectiveness of our method which can strike a balance between accuracy and efficiency.
Model Inversion Robustness: Can Transfer Learning Help?
Authors: Koh Jun Hao, Keshigeyan Chandrasegaran, Ngoc-Bao Nguyen, Ngai-Man Cheung Sy-Tuyen Ho
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Model Inversion (MI) attacks aim to reconstruct private training data by abusing access to machine learning models. Contemporary MI attacks have achieved impressive attack performance posing serious threats to privacy. Meanwhile all existing MI defense methods rely on regularization that is in direct conflict with the training objective resulting in noticeable degradation in model utility. In this work we take a different perspective and propose a novel and simple Transfer Learning-based Defense against Model Inversion (TL-DMI) to render MI-robust models. Particularly by leveraging TL we limit the number of layers encoding sensitive information from private training dataset thereby degrading the performance of MI attack. We conduct an analysis using Fisher Information to justify our method. Our defense is remarkably simple to implement. Without bells and whistles we show in extensive experiments that TL-DMI achieves state-of-the-art (SOTA) MI robustness. Our code pre-trained models demo and inverted data are available at: https://hosytuyen.github.io/projects/TL-DMI
Portrait4D: Learning One-Shot 4D Head Avatar Synthesis using Synthetic Data
Authors: Duomin Wang, Xiaohang Ren, Xingyu Chen, Baoyuan Wang Yu Deng
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Existing one-shot 4D head synthesis methods usually learn from monocular videos with the aid of 3DMM reconstruction yet the latter is evenly challenging which restricts them from reasonable 4D head synthesis. We present a method to learn one-shot 4D head synthesis via large-scale synthetic data. The key is to first learn a part-wise 4D generative model from monocular images via adversarial learning to synthesize multi-view images of diverse identities and full motions as training data; then leverage a transformer-based animatable triplane reconstructor to learn 4D head reconstruction using the synthetic data. A novel learning strategy is enforced to enhance the generalizability to real images by disentangling the learning process of 3D reconstruction and reenactment. Experiments demonstrate our superiority over the prior art.
GP-NeRF: Generalized Perception NeRF for Context-Aware 3D Scene Understanding
Authors: Dingwen Zhang, Yalun Dai, Nian Liu, Lechao Cheng, Jingfeng Li, Jingdong Wang, Junwei Han Hao Li
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Applying Neural Radiance Fields (NeRF) to downstream perception tasks for scene understanding and representation is becoming increasingly popular. Most existing methods treat semantic prediction as an additional rendering task i.e. the "label rendering" task to build semantic NeRFs. However by rendering semantic/instance labels per pixel without considering the contextual information of the rendered image these methods usually suffer from unclear boundary segmentation and abnormal segmentation of pixels within an object. To solve this problem we propose Generalized Perception NeRF (GP-NeRF) a novel pipeline that makes the widely used segmentation model and NeRF work compatibly under a unified framework for facilitating context-aware 3D scene perception. To accomplish this goal we introduce transformers to aggregate radiance as well as semantic embedding fields jointly for novel views and facilitate the joint volumetric rendering of both fields. In addition we propose two self-distillation mechanisms i.e. the Semantic Distill Loss and the Depth-Guided Semantic Distill Loss to enhance the discrimination and quality of the semantic field and the maintenance of geometric consistency. In evaluation as shown in Fig. 1 we conduct experimental comparisons under two perception tasks (i.e. semantic and instance segmentation) using both synthetic and real-world datasets. Notably our method outperforms SOTA approaches by 6.94% 11.76% and 8.47% on generalized semantic segmentation finetuning semantic segmentation and instance segmentation respectively
Polarization Wavefront Lidar: Learning Large Scene Reconstruction from Polarized Wavefronts
Authors: Chenyang Lei, Seung-Hwan Baek, Mario Bijelic, Felix Heide Dominik Scheuble
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Lidar has become a cornerstone sensing modality for 3D vision especially for large outdoor scenarios and autonomous driving. Conventional lidar sensors are capable of providing centimeter-accurate distance information by emitting laser pulses into a scene and measuring the time-of-flight (ToF) of the reflection. However the polarization of the received light that depends on the surface orientation and material properties is usually not considered. As such the polarization modality has the potential to improve scene reconstruction beyond distance measurements. In this work we introduce a novel long-range polarization wavefront lidar sensor (PolLidar) that modulates the polarization of the emitted and received light. Departing from conventional lidar sensors PolLidar allows access to the raw time-resolved polarimetric wavefronts. We leverage polarimetric wavefronts to estimate normals distance and material properties in outdoor scenarios with a novel learned reconstruction method. To train and evaluate the method we introduce a simulated and real-world long-range dataset with paired raw lidar data ground truth distance and normal maps. We find that the proposed method improves normal and distance reconstruction by 53% mean angular error and 41% mean absolute error compared to existing shape-from-polarization (SfP) and ToF methods. Code and data are open-sourced here.
GDA: Generalized Diffusion for Robust Test-time Adaptation
Authors: Fu-Chen Chen, Albert Y. C. Chen, Junfeng Yang, Che-Chun Su, Min Sun, Cheng-Hao Kuo Yun-Yun Tsai
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Machine learning models face generalization challenges when exposed to out-of-distribution (OOD) samples with unforeseen distribution shifts. Recent research reveals that for vision tasks test-time adaptation employing diffusion models can achieve state-of-the-art accuracy improvements on OOD samples by generating domain-aligned samples without altering the model's weights. Unfortunately those studies have primarily focused on pixel-level corruptions thereby lacking the generalization to adapt to a broader range of OOD types. We introduce Generalized Diffusion Adaptation (GDA) a novel diffusion-based test-time adaptation method robust against diverse OOD types. Specifically GDA iteratively guides the diffusion by applying a marginal entropy loss derived from the model in conjunction with style and content preservation losses during the reverse sampling process. In other words GDA considers the model's output behavior and the samples' semantic information as a whole reducing ambiguity in downstream tasks. based adaptation. Evaluation across various model architectures and OOD benchmarks indicates that GDA consistently surpasses previous diffusion-based adaptation methods. Notably it achieves the highest classification accuracy improvements ranging from 4.4% to 5.02% on ImageNet-C and 2.5% to 7.4% on Rendition Sketch and Stylized benchmarks. This performance highlights GDA's generalization to a broader range of OOD benchmarks.
ConvoFusion: Multi-Modal Conversational Diffusion for Co-Speech Gesture Synthesis
Authors: Rishabh Dabral, Ikhsanul Habibie, Lucia Donatelli, Marc Habermann, Christian Theobalt Muhammad Hamza Mughal
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Gestures play a key role in human communication. Recent methods for co-speech gesture generation while managing to generate beat-aligned motions struggle generating gestures that are semantically aligned with the utterance. Compared to beat gestures that align naturally to the audio signal semantically coherent gestures require modeling the complex interactions between the language and human motion and can be controlled by focusing on certain words. Therefore we present ConvoFusion a diffusion-based approach for multi-modal gesture synthesis which can not only generate gestures based on multi-modal speech inputs but can also facilitate controllability in gesture synthesis. Our method proposes two guidance objectives that allow the users to modulate the impact of different conditioning modalities (e.g. audio vs text) as well as to choose certain words to be emphasized during gesturing. Our method is versatile in that it can be trained either for generating monologue gestures or even the conversational gestures. To further advance the research on multi-party interactive gestures the DnD Group Gesture dataset is released which contains 6 hours of gesture data showing 5 people interacting with one another. We compare our method with several recent works and demonstrate effectiveness of our method on a variety of tasks. We urge the reader to watch our supplementary video at https://vcai.mpi-inf.mpg.de/projects/ConvoFusion/.
RLHF-V: Towards Trustworthy MLLMs via Behavior Alignment from Fine-grained Correctional Human Feedback
Authors: Yuan Yao, Haoye Zhang, Taiwen He, Yifeng Han, Ganqu Cui, Jinyi Hu, Zhiyuan Liu, Hai-Tao Zheng, Maosong Sun, Tat-Seng Chua Tianyu Yu
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Multimodal Large Language Models (MLLMs) have recently demonstrated impressive capabilities in multimodal understanding reasoning and interaction. However existing MLLMs prevalently suffer from serious hallucination problems generating text that is not factually grounded in associated images. The problem makes existing MLLMs untrustworthy and thus impractical in real-world (especially high-stakes) applications. To address the challenge we present RLHF-V which enhances MLLM trustworthiness via behavior alignment from fine-grained correctional human feedback. Specifically RLHF-V collects human preference in the form of segment-level corrections on hallucinations and performs dense direct preference optimization over the human feedback. Comprehensive experiments on five benchmarks in both automatic and human evaluation show that RLHF-V can enable substantially more trustworthy MLLM behaviors with promising data and computation efficiency. Remarkably using 1.4k annotated data samples RLHF-V significantly reduces the hallucination rate of the base MLLM by 34.8% outperforming the concurrent LLaVA-RLHF trained on 10k annotated data. The final model achieves state-of-the-art performance in trustworthiness among open-source MLLMs and shows better robustness than GPT-4V in preventing hallucinations aroused from over-generalization. All the data code and model weights will be released to facilitate future research.
ZeroShape: Regression-based Zero-shot Shape Reconstruction
Authors: Stefan Stojanov, Anh Thai, Varun Jampani, James M. Rehg Zixuan Huang
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: We study the problem of single-image zero-shot 3D shape reconstruction. Recent works learn zero-shot shape reconstruction through generative modeling of 3D assets but these models are computationally expensive at train and inference time. In contrast the traditional approach to this problem is regression-based where deterministic models are trained to directly regress the object shape. Such regression methods possess much higher computational efficiency than generative methods. This raises a natural question: is generative modeling necessary for high performance or conversely are regression-based approaches still competitive? To answer this we design a strong regression-based model called ZeroShape based on the converging findings in this field and a novel insight. We also curate a large real-world evaluation benchmark with objects from three different real-world 3D datasets. This evaluation benchmark is more diverse and an order of magnitude larger than what prior works use to quantitatively evaluate their models aiming at reducing the evaluation variance in our field. We show that ZeroShape not only achieves superior performance over state-of-the-art methods but also demonstrates significantly higher computational and data efficiency.
Continual-MAE: Adaptive Distribution Masked Autoencoders for Continual Test-Time Adaptation
Authors: Ran Xu, Senqiao Yang, Renrui Zhang, Qizhe Zhang, Zehui Chen, Yandong Guo, Shanghang Zhang Jiaming Liu
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Continual Test-Time Adaptation (CTTA) is proposed to migrate a source pre-trained model to continually changing target distributions addressing real-world dynamism. Existing CTTA methods mainly rely on entropy minimization or teacher-student pseudo-labeling schemes for knowledge extraction in unlabeled target domains. However dynamic data distributions cause miscalibrated predictions and noisy pseudo-labels in existing self-supervised learning methods hindering the effective mitigation of error accumulation and catastrophic forgetting problems during the continual adaptation process. To tackle these issues we propose a continual self-supervised method Adaptive Distribution Masked Autoencoders (ADMA) which enhances the extraction of target domain knowledge while mitigating the accumulation of distribution shifts. Specifically we propose a Distribution-aware Masking (DaM) mechanism to adaptively sample masked positions followed by establishing consistency constraints between the masked target samples and the original target samples. Additionally for masked tokens we utilize an efficient decoder to reconstruct a hand-crafted feature descriptor (e.g. Histograms of Oriented Gradients) leveraging its invariant properties to boost task-relevant representations. Through conducting extensive experiments on four widely recognized benchmarks our proposed method attains state-of-the-art performance in both classification and segmentation CTTA tasks.
The STVchrono Dataset: Towards Continuous Change Recognition in Time
Authors: Yue Qiu, Mariia Khan, Fumiya Matsuzawa, Kenji Iwata Yanjun Sun
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Recognizing continuous changes offers valuable insights into past historical events supports current trend analysis and facilitates future planning. This knowledge is crucial for a variety of fields such as meteorology and agriculture environmental science urban planning and construction tourism and cultural preservation. Currently available datasets in the field of scene change understanding primarily concentrate on two main tasks: the detection of changed regions within a scene and the linguistic description of the change content. Existing datasets focus on recognizing discrete changes such as adding or deleting an object from two images and largely rely on artificially generated images. Consequently the existing change understanding methods primarily focus on identifying distinct object differences overlooking the importance of continuous gradual changes occurring over extended time intervals. To address the above issues we propose a novel benchmark dataset STVchrono targeting the localization and description of long-term continuous changes in real-world scenes. The dataset consists of 71900 photographs from Google Street View API taken over an 18-year span across 50 cities all over the world. Our STVchrono dataset is designed to support real-world continuous change recognition and description in both image pairs and extended image sequences while also enabling the segmentation of changed regions. We conduct experiments to evaluate state-of-the-art methods on continuous change description and segmentation as well as multimodal Large Language Models for describing changes. Our findings reveal that even the most advanced methods lag human performance emphasizing the need to adapt them to continuously changing real-world scenarios. We hope that our benchmark dataset will further facilitate the research of temporal change recognition in a dynamic world. The STVchrono dataset is available at STVchrono Dataset.
SocialCircle: Learning the Angle-based Social Interaction Representation for Pedestrian Trajectory Prediction
Authors: Beihao Xia, Ziqian Zou, Yulong Wang, Xinge You Conghao Wong
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Analyzing and forecasting trajectories of agents like pedestrians and cars in complex scenes has become more and more significant in many intelligent systems and applications. The diversity and uncertainty in socially interactive behaviors among a rich variety of agents make this task more challenging than other deterministic computer vision tasks. Researchers have made a lot of efforts to quantify the effects of these interactions on future trajectories through different mathematical models and network structures but this problem has not been well solved. Inspired by marine animals that localize the positions of their companions underwater through echoes we build a new anglebased trainable social interaction representation named SocialCircle for continuously reflecting the context of social interactions at different angular orientations relative to the target agent. We validate the effect of the proposed SocialCircle by training it along with several newly released trajectory prediction models and experiments show that the SocialCircle not only quantitatively improves the prediction performance but also qualitatively helps better simulate social interactions when forecasting pedestrian trajectories in a way that is consistent with human intuitions.
Boosting Neural Representations for Videos with a Conditional Decoder
Authors: Ren Yang, Dailan He, Xingtong Ge, Tongda Xu, Yan Wang, Hongwei Qin, Jun Zhang Xinjie Zhang
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Implicit neural representations (INRs) have emerged as a promising approach for video storage and processing showing remarkable versatility across various video tasks. However existing methods often fail to fully leverage their representation capabilities primarily due to inadequate alignment of intermediate features during target frame decoding. This paper introduces a universal boosting framework for current implicit video representation approaches. Specifically we utilize a conditional decoder with a temporal-aware affine transform module which uses the frame index as a prior condition to effectively align intermediate features with target frames. Besides we introduce a sinusoidal NeRV-like block to generate diverse intermediate features and achieve a more balanced parameter distribution thereby enhancing the model's capacity. With a high-frequency information-preserving reconstruction loss our approach successfully boosts multiple baseline INRs in the reconstruction quality and convergence speed for video regression and exhibits superior inpainting and interpolation results. Further we integrate a consistent entropy minimization technique and develop video codecs based on these boosted INRs. Experiments on the UVG dataset confirm that our enhanced codecs significantly outperform baseline INRs and offer competitive rate-distortion performance compared to traditional and learning-based codecs. Code is available at https://github.com/Xinjie-Q/Boosting-NeRV.
Dual-Enhanced Coreset Selection with Class-wise Collaboration for Online Blurry Class Incremental Learning
Authors: Shiqi Zhao, Haoran Wu, Zhiwu Lu Yutian Luo
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Traditional online class incremental learning assumes class sets in different tasks are disjoint. However recent works have shifted towards a more realistic scenario where tasks have shared classes creating blurred task boundaries. Under this setting although existing approaches could be directly applied challenges like data imbalance and varying class-wise data volumes complicate the critical coreset selection used for replay. To tackle these challenges we introduce DECO (Dual-Enhanced Coreset Selection with Class-wise Collaboration) an approach that starts by establishing a class-wise balanced memory to address data imbalances followed by a tailored class-wise gradient-based similarity scoring system for refined coreset selection strategies with reasonable score guidance to all classes. DECO is distinguished by two main strategies: (1) Collaborative Diverse Score Guidance that mitigates biased knowledge in less-exposed classes through guidance from well-established classes simultaneously consolidating the knowledge in the established classes to enhance overall stability. (2) Adaptive Similarity Score Constraint that relaxes constraints between class types boosting learning plasticity for less-exposed classes and assisting well-established classes in defining clearer boundaries thereby improving overall plasticity. Overall DECO helps effectively identify critical coreset samples improving learning stability and plasticity across all classes. Extensive experiments are conducted on four benchmark datasets to demonstrate the effectiveness and superiority of DECO over other competitors under this online blurry class incremental learning setting.
From Audio to Photoreal Embodiment: Synthesizing Humans in Conversations
Authors: Javier Romero, Timur Bagautdinov, Shaojie Bai, Trevor Darrell, Angjoo Kanazawa, Alexander Richard Evonne Ng
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: We present a framework for generating full-bodied photorealistic avatars that gesture according to the conversational dynamics of a dyadic interaction. Given speech audio we output multiple possibilities of gestural motion for an individual including face body and hands. The key behind our method is in combining the benefits of sample diversity from vector quantization with the high-frequency details obtained through diffusion to generate more dynamic expressive motion. We visualize the generated motion using highly photorealistic avatars that can express crucial nuances in gestures (e.g. sneers and smirks). To facilitate this line of research we introduce a first-of-its-kind multi-view conversational dataset that allows for photorealistic reconstruction. Experiments show our model generates appropriate and diverse gestures outperforming both diffusion- and VQ-only methods. Furthermore our perceptual evaluation highlights the importance of photorealism (vs. meshes) in accurately assessing subtle motion details in conversational gestures. Code and dataset available on project page.
Single-View Scene Point Cloud Human Grasp Generation
Authors: Chengyi Xing, Yi-Lin Wei, Xiao-Ming Wu, Wei-Shi Zheng Yan-Kang Wang
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: In this work we explore a novel task of generating human grasps based on single-view scene point clouds which more accurately mirrors the typical real-world situation of observing objects from a single viewpoint. Due to the incompleteness of object point clouds and the presence of numerous scene points the generated hand is prone to penetrating into the invisible parts of the object and the model is easily affected by scene points. Thus we introduce S2HGrasp a framework composed of two key modules: the Global Perception module that globally perceives partial object point clouds and the DiffuGrasp module designed to generate high-quality human grasps based on complex inputs that include scene points. Additionally we introduce S2HGD dataset which comprises approximately 99000 single-object single-view scene point clouds of 1668 unique objects each annotated with one human grasp. Our extensive experiments demonstrate that S2HGrasp can not only generate natural human grasps regardless of scene points but also effectively prevent penetration between the hand and invisible parts of the object. Moreover our model showcases strong generalization capability when applied to unseen objects. Our code and dataset are available at https://github.com/iSEE-Laboratory/S2HGrasp.
One-step Diffusion with Distribution Matching Distillation
Authors: Michaël Gharbi, Richard Zhang, Eli Shechtman, Frédo Durand, William T. Freeman, Taesung Park Tianwei Yin
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Diffusion models generate high-quality images but require dozens of forward passes. We introduce Distribution Matching Distillation (DMD) a procedure to transform a diffusion model into a one-step image generator with minimal impact on image quality. We enforce the one-step image generator match the diffusion model at distribution level by minimizing an approximate KL divergence whose gradient can be expressed as the difference between 2 score functions one of the target distribution and the other of the synthetic distribution being produced by our one-step generator. The score functions are parameterized as two diffusion models trained separately on each distribution. Combined with a simple regression loss matching the large-scale structure of the multi-step diffusion outputs our method outperforms all published few-step diffusion approaches reaching 2.62 FID on ImageNet 64x64 and 11.49 FID on zero-shot COCO-30k comparable to Stable Diffusion but orders of magnitude faster. Utilizing FP16 inference our model can generate images at 20 FPS on modern hardware.
Cyclic Learning for Binaural Audio Generation and Localization
Authors: Bin Zhao, Yuan Yuan Zhaojian Li
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Binaural audio is obtained by simulating the biological structure of human ears which plays an important role in artificial immersive spaces. A promising approach is to utilize mono audio and corresponding vision to synthesize binaural audio thereby avoiding expensive binaural audio recording. However most existing methods directly use the entire scene as a guide ignoring the correspondence between sounds and sounding objects. In this paper we advocate generating binaural audio using fine-grained raw waveform and object-level visual information as guidance. Specifically we propose a Cyclic Locating-and-UPmixing (CLUP) framework that jointly learns visual sounding object localization and binaural audio generation. Visual sounding object localization establishes the correspondence between specific visual objects and sound modalities which provides object-aware guidance to improve binaural generation performance. Meanwhile the spatial information contained in the generated binaural audio can further improve the performance of sounding object localization. In this case visual sounding object localization and binaural audio generation can achieve cyclic learning and benefit from each other. Experimental results demonstrate that on the FAIR-Play benchmark dataset our method is significantly ahead of the existing baselines in multiple evaluation metrics (STFT\downarrow: 0.787 vs. 0.851 ENV\downarrow: 0.128 vs. 0.134 WAV\downarrow: 5.244 vs. 5.684 SNR\uparrow: 7.546 vs. 7.044).
Neighbor Relations Matter in Video Scene Detection
Authors: Hongxing Wang, Jiaxin Li, Zhilong Ou, Zhangbin Qian Jiawei Tan
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Video scene detection aims to temporally link shots for obtaining semantically compact scenes. It is essential for this task to capture scene-distinguishable affinity among shots by similarity assessment. However most methods relies on ordinary shot-to-shot similarities which may inveigle similar shots into being linked even though they are from different scenes and meanwhile hinder dissimilar shots from being blended into a complete scene. In this paper we propose NeighborNet to inject shot contexts into shot-to-shot similarities through carefully exploring the relations between semantic/temporal neighbors of shots over a local time period. In this way shot-to-shot similarities are remeasured as semantic/temporal neighbor-aware similarities so that NeighborNet can learn context embedding into shot features using graph convolutional network. As a result not only do the learned shot features suppress the affinity among similar shots from different scenes but they also promote the affinity among dissimilar shots in the same scene. Experimental results on public benchmark datasets show that our proposed NeighborNet yields substantial improvements in video scene detection especially outperforms released state-of-the-arts by at least 6% in Average Precision (AP). The code is available at https://github.com/ExMorgan-Alter/NeighborNet.
Rethinking Human Motion Prediction with Symplectic Integral
Authors: Kedi Lyu, Zhenguang Liu, Yifang Yin, Xun Yang, Yingda Lyu Haipeng Chen
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Long-term and accurate forecasting is the long-standing pursuit of the human motion prediction task. Existing methods typically suffer from dramatic degradation in prediction accuracy with the increasing prediction horizon. It comes down to two reasons:1? Insufficient numerical stability.Unforeseen high noise and complex feature relationships in the data. 2? Inadequate modeling stability. Unreasonable step sizes and undesirable parameter updates in the prediction.In this paper we design a novel and symplectic integral-inspired framework named symplectic integral neural network (SINN) which engages symplectic trajectories to optimize the pose representation and employs a stable symplectic operator to alternately model the dynamic context. Specifically we design a Symplectic Representation Encoder that performs on enhanced human pose representation to obtain trajectories on the symplectic manifold ensuring numerical stability based on Hamiltonian mechanics and symplectic spatial splitting algorithm. We further present the Symplectic Temporal Aggregation module in the light of the symplectic temporal splitting algorithm which splits the long-term prediction into multiple accurate short-term predictions generated by a symplectic operator to secure modeling stability. Moreover our approach is model-agnostic and can be efficiently integrated with different physical dynamics models.The experimental results demonstrate that our method achieves the new state-of-the-art outperforming existing methods by large margins:20.1%on Human3.6M16.7%on CUM Mocap and 10.2% on 3DPW.
Text-to-Image Diffusion Models are Great Sketch-Photo Matchmakers
Authors: Ayan Kumar Bhunia, Aneeshan Sain, Pinaki Nath Chowdhury, Tao Xiang, Yi-Zhe Song Subhadeep Koley
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: This paper for the first time explores text-to-image diffusion models for Zero-Shot Sketch-based Image Retrieval (ZS-SBIR). We highlight a pivotal discovery: the capacity of text-to-image diffusion models to seamlessly bridge the gap between sketches and photos. This proficiency is underpinned by their robust cross-modal capabilities and shape bias findings that are substantiated through our pilot studies. In order to harness pre-trained diffusion models effectively we introduce a straightforward yet powerful strategy focused on two key aspects: selecting optimal feature layers and utilising visual and textual prompts. For the former we identify which layers are most enriched with information and are best suited for the specific retrieval requirements (category-level or fine-grained). Then we employ visual and textual prompts to guide the model's feature extraction process enabling it to generate more discriminative and contextually relevant cross-modal representations. Extensive experiments on several benchmark datasets validate significant performance improvements.
Mudslide: A Universal Nuclear Instance Segmentation Method
Authors: Jun Wang
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Nuclear instance segmentation has played a critical role in pathology image analysis. The main challenges arise from the difficulty in accurately segmenting densely overlapping instances and the high cost of precise mask-level annotations. Existing fully-supervised nuclear instance segmentation methods such as boundary-based methods struggle to capture differences between overlapping instances and thus fail in densely distributed blurry regions. They also face challenges transitioning to point supervision where annotations are simple and effective. Inspired by natural mudslides we propose a universal method called Mudslide that uses simple representations to characterize differences between different instances and can easily be extended from fully-supervised to point-supervised. oncretely we introduce a collapse field and leverage it to construct a force map and initial boundary enabling a distinctive representation for each instance. Each pixel is assigned a collapse force with distinct directions between adjacent instances. Starting from the initial boundary Mudslide executes a pixel-by-pixel collapse along various force directions. Pixels that collapse into the same region are considered as one instance concurrently accounting for both inter-instance distinctions and intra-instance coherence. Experiments on public datasets show superior performance in both fully-supervised and point-supervised tasks.
CPGA: Coding Priors-Guided Aggregation Network for Compressed Video Quality Enhancement
Authors: Jinhua Hao, Yukang Ding, Yu Liu, Qiao Mo, Ming Sun, Chao Zhou, Shuyuan Zhu Qiang Zhu
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Recently numerous approaches have achieved notable success in compressed video quality enhancement (VQE). However these methods usually ignore the utilization of valuable coding priors inherently embedded in compressed videos such as motion vectors and residual frames which carry abundant temporal and spatial information. To remedy this problem we propose the Coding Priors-Guided Aggregation (CPGA) network to utilize temporal and spatial information from coding priors. The CPGA mainly consists of an inter-frame temporal aggregation (ITA) module and a multi-scale non-local aggregation (MNA) module. Specifically the ITA module aggregates temporal information from consecutive frames and coding priors while the MNA module globally captures spatial information guided by residual frames. In addition to facilitate research in VQE task we newly construct the Video Coding Priors (VCP) dataset comprising 300 videos with various coding priors extracted from corresponding bitstreams. It remedies the shortage of previous datasets on the lack of coding information. Experimental results demonstrate the superiority of our method compared to existing state-of-the-art methods. The code and dataset will be released at https://github.com/VQE-CPGA/CPGA.
MicroCinema: A Divide-and-Conquer Approach for Text-to-Video Generation
Authors: Jianmin Bao, Wenming Weng, Ruoyu Feng, Dacheng Yin, Tao Yang, Jingxu Zhang, Qi Dai, Zhiyuan Zhao, Chunyu Wang, Kai Qiu, Yuhui Yuan, Xiaoyan Sun, Chong Luo, Baining Guo Yanhui Wang
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: We present MicroCinema a straightforward yet effective framework for high-quality and coherent text-to-video generation. Unlike existing approaches that align text prompts with video directly MicroCinema introduces a Divide-and-Conquer strategy which divides the text-to-video into a two-stage process: text-to-image generation and image&text-to-video generation. This strategy offers two significant advantages. a) It allows us to take full advantage of the recent advances in text-to-image models such as Stable Diffusion Midjourney and DALLE to generate photorealistic and highly detailed images. b) Leveraging the generated image the model can allocate less focus to fine-grained appearance details prioritizing the efficient learning of motion dynamics. To implement this strategy effectively we introduce two core designs. First we propose the Appearance Injection Network enhancing the preservation of the appearance of the given image. Second we introduce the Appearance Noise Prior a novel mechanism aimed at maintaining the capabilities of pre-trained 2D diffusion models. These design elements empower MicroCinema to generate high-quality videos with precise motion guided by the provided text prompts. Extensive experiments demonstrate the superiority of the proposed framework. Concretely MicroCinema achieves SOTA zero-shot FVD of 342.86 on UCF-101 and 377.40 on MSR-VTT.
Learning Instance-Aware Correspondences for Robust Multi-Instance Point Cloud Registration in Cluttered Scenes
Authors: Zheng Qin, Lintao Zheng, Kai Xu Zhiyuan Yu
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Multi-instance point cloud registration estimates the poses of multiple instances of a model point cloud in a scene point cloud. Extracting accurate point correspondences is to the center of the problem. Existing approaches usually treat the scene point cloud as a whole overlooking the separation of instances. Therefore point features could be easily polluted by other points from the background or different instances leading to inaccurate correspondences oblivious to separate instances especially in cluttered scenes. In this work we propose MIRETR Multi-Instance REgistration TRansformer a coarse-to-fine approach to the extraction of instance-aware correspondences. At the coarse level it jointly learns instance-aware superpoint features and predicts per-instance masks. With instance masks the influence from outside of the instance being concerned is minimized such that highly reliable superpoint correspondences can be extracted. The superpoint correspondences are then extended to instance candidates at the fine level according to the instance masks. At last an efficient candidate selection and refinement algorithm is devised to obtain the final registrations. Extensive experiments on three public benchmarks demonstrate the efficacy of our approach. In particular MIRETR outperforms the state of the arts by 16.6 points on F1 score on the challenging ROBI benchmark. Code and models are available at https://github.com/zhiyuanYU134/MIRETR
Structure Matters: Tackling the Semantic Discrepancy in Diffusion Models for Image Inpainting
Authors: Yang Wang, Biao Qian, Meng Wang, Yong Rui Haipeng Liu
Published in: IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2024 (Main Conference Track), 2024

Abstract: Denoising diffusion probabilistic models (DDPMs) for image inpainting aim to add the noise to the texture of the image during the forward process and recover the masked regions with the unmasked ones of the texture via the reverse denoising process. Despite the meaningful semantics generation the existing arts suffer from the semantic discrepancy between the masked and unmasked regions since the semantically dense unmasked texture fails to be completely degraded while the masked regions turn to the pure noise in diffusion process leading to the large discrepancy between them. In this paper we aim to answer how the unmasked semantics guide the texture denoising process; together with how to tackle the semantic discrepancy to facilitate the consistent and meaningful semantics generation. To this end we propose a novel structure-guided diffusion model for image inpainting named StrDiffusion to reformulate the conventional texture denoising process under the structure guidance to derive a simplified denoising objective for image inpainting while revealing: 1) the semantically sparse structure is beneficial to tackle the semantic discrepancy in the early stage while the dense texture generates the reasonable semantics in the late stage; 2) the semantics from the unmasked regions essentially offer the time-dependent structure guidance for the texture denoising process benefiting from the time-dependent sparsity of the structure semantics. For the denoising process a structure-guided neural network is trained to estimate the simplified denoising objective by exploiting the consistency of the denoised structure between masked and unmasked regions. Besides we devise an adaptive resampling strategy as a formal criterion as whether the structure is competent to guide the texture denoising process while regulate their semantic correlations. Extensive experiments validate the merits of StrDiffusion over the state-of-the-arts. Our code is available at https://github.com/htyjers/StrDiffusion.