Search Results for author: Shalini De Mello

Found 39 papers, 18 papers with code

RegionGPT: Towards Region Understanding Vision Language Model

no code implementations4 Mar 2024 Qiushan Guo, Shalini De Mello, Hongxu Yin, Wonmin Byeon, Ka Chun Cheung, Yizhou Yu, Ping Luo, Sifei Liu

Vision language models (VLMs) have experienced rapid advancements through the integration of large language models (LLMs) with image-text pairs, yet they struggle with detailed regional visual understanding due to limited spatial awareness of the vision encoder, and the use of coarse-grained training data that lacks detailed, region-specific captions.

Language Modelling

What You See is What You GAN: Rendering Every Pixel for High-Fidelity Geometry in 3D GANs

no code implementations4 Jan 2024 Alex Trevithick, Matthew Chan, Towaki Takikawa, Umar Iqbal, Shalini De Mello, Manmohan Chandraker, Ravi Ramamoorthi, Koki Nagano

3D-aware Generative Adversarial Networks (GANs) have shown remarkable progress in learning to generate multi-view-consistent images and 3D geometries of scenes from collections of 2D images via neural volume rendering.

Neural Rendering Super-Resolution

GAvatar: Animatable 3D Gaussian Avatars with Implicit Mesh Learning

no code implementations18 Dec 2023 Ye Yuan, Xueting Li, Yangyi Huang, Shalini De Mello, Koki Nagano, Jan Kautz, Umar Iqbal

Gaussian splatting has emerged as a powerful 3D representation that harnesses the advantages of both explicit (mesh) and implicit (NeRF) 3D representations.

A Unified Approach for Text- and Image-guided 4D Scene Generation

no code implementations28 Nov 2023 Yufeng Zheng, Xueting Li, Koki Nagano, Sifei Liu, Karsten Kreis, Otmar Hilliges, Shalini De Mello

Large-scale diffusion generative models are greatly simplifying image, video and 3D asset creation from user-provided text prompts and images.

Scene Generation

3D Reconstruction with Generalizable Neural Fields using Scene Priors

no code implementations26 Sep 2023 Yang Fu, Shalini De Mello, Xueting Li, Amey Kulkarni, Jan Kautz, Xiaolong Wang, Sifei Liu

NFP not only demonstrates SOTA scene reconstruction performance and efficiency, but it also supports single-image novel-view synthesis, which is underexplored in neural fields.

3D Reconstruction 3D Scene Reconstruction +1

Investigation of Architectures and Receptive Fields for Appearance-based Gaze Estimation

1 code implementation18 Aug 2023 Yunhan Wang, Xiangwei Shi, Shalini De Mello, Hyung Jin Chang, Xucong Zhang

With the rapid development of deep learning technology in the past decade, appearance-based gaze estimation has attracted great attention from both computer vision and human-computer interaction research communities.

Contrastive Learning Disentanglement +2

Generalizable One-shot Neural Head Avatar

no code implementations14 Jun 2023 Xueting Li, Shalini De Mello, Sifei Liu, Koki Nagano, Umar Iqbal, Jan Kautz

We present a method that reconstructs and animates a 3D head avatar from a single-view portrait image.

Super-Resolution

Zero-shot Pose Transfer for Unrigged Stylized 3D Characters

1 code implementation CVPR 2023 Jiashun Wang, Xueting Li, Sifei Liu, Shalini De Mello, Orazio Gallo, Xiaolong Wang, Jan Kautz

We present a zero-shot approach that requires only the widely available deformed non-stylized avatars in training, and deforms stylized characters of significantly different shapes at inference.

Pose Transfer

Avatar Fingerprinting for Authorized Use of Synthetic Talking-Head Videos

no code implementations5 May 2023 Ekta Prashnani, Koki Nagano, Shalini De Mello, David Luebke, Orazio Gallo

This allows us to link the synthetic video to the identity driving the expressions in the video, regardless of the facial appearance shown.

GPViT: A High Resolution Non-Hierarchical Vision Transformer with Group Propagation

2 code implementations13 Dec 2022 Chenhongyi Yang, Jiarui Xu, Shalini De Mello, Elliot J. Crowley, Xiaolong Wang

In each GP Block, features are first grouped together by a fixed number of learnable group tokens; we then perform Group Propagation where global information is exchanged between the grouped features; finally, global information in the updated grouped features is returned back to the image features through a transformer decoder.

Image Classification Instance Segmentation +5

CoordGAN: Self-Supervised Dense Correspondences Emerge from GANs

1 code implementation CVPR 2022 Jiteng Mu, Shalini De Mello, Zhiding Yu, Nuno Vasconcelos, Xiaolong Wang, Jan Kautz, Sifei Liu

We represent the correspondence maps of different images as warped coordinate frames transformed from a canonical coordinate frame, i. e., the correspondence map, which describes the structure (e. g., the shape of a face), is controlled via a transformation.

Disentanglement

FreeSOLO: Learning to Segment Objects without Annotations

1 code implementation CVPR 2022 Xinlong Wang, Zhiding Yu, Shalini De Mello, Jan Kautz, Anima Anandkumar, Chunhua Shen, Jose M. Alvarez

FreeSOLO further demonstrates superiority as a strong pre-training method, outperforming state-of-the-art self-supervised pre-training methods by +9. 8% AP when fine-tuning instance segmentation with only 5% COCO masks.

Instance Segmentation object-detection +4

GroupViT: Semantic Segmentation Emerges from Text Supervision

2 code implementations CVPR 2022 Jiarui Xu, Shalini De Mello, Sifei Liu, Wonmin Byeon, Thomas Breuel, Jan Kautz, Xiaolong Wang

With only text supervision and without any pixel-level annotations, GroupViT learns to group together semantic regions and successfully transfers to the task of semantic segmentation in a zero-shot manner, i. e., without any further fine-tuning.

Object Detection Scene Understanding +3

Learning Continuous Environment Fields via Implicit Functions

no code implementations ICLR 2022 Xueting Li, Shalini De Mello, Xiaolong Wang, Ming-Hsuan Yang, Jan Kautz, Sifei Liu

We propose a novel scene representation that encodes reaching distance -- the distance between any position in the scene to a goal along a feasible trajectory.

Position Trajectory Prediction

Learning Contrastive Representation for Semantic Correspondence

no code implementations22 Sep 2021 Taihong Xiao, Sifei Liu, Shalini De Mello, Zhiding Yu, Jan Kautz, Ming-Hsuan Yang

Dense correspondence across semantically related images has been extensively studied, but still faces two challenges: 1) large variations in appearance, scale and pose exist even for objects from the same category, and 2) labeling pixel-level dense correspondences is labor intensive and infeasible to scale.

Contrastive Learning Semantic correspondence

Weakly-Supervised Physically Unconstrained Gaze Estimation

1 code implementation CVPR 2021 Rakshit Kothari, Shalini De Mello, Umar Iqbal, Wonmin Byeon, Seonwook Park, Jan Kautz

A major challenge for physically unconstrained gaze estimation is acquiring training data with 3D gaze annotations for in-the-wild and outdoor scenarios.

Domain Generalization Gaze Estimation

Learning to Track Instances without Video Annotations

no code implementations CVPR 2021 Yang Fu, Sifei Liu, Umar Iqbal, Shalini De Mello, Humphrey Shi, Jan Kautz

Tracking segmentation masks of multiple instances has been intensively studied, but still faces two fundamental challenges: 1) the requirement of large-scale, frame-wise annotation, and 2) the complexity of two-stage approaches.

Instance Segmentation Pose Estimation +1

Online Adaptation for Consistent Mesh Reconstruction in the Wild

no code implementations NeurIPS 2020 Xueting Li, Sifei Liu, Shalini De Mello, Kihwan Kim, Xiaolong Wang, Ming-Hsuan Yang, Jan Kautz

This paper presents an algorithm to reconstruct temporally consistent 3D meshes of deformable object instances from videos in the wild.

3D Reconstruction

Self-Learning Transformations for Improving Gaze and Head Redirection

2 code implementations NeurIPS 2020 Yufeng Zheng, Seonwook Park, Xucong Zhang, Shalini De Mello, Otmar Hilliges

Furthermore, we show that in the presence of limited amounts of real-world training data, our method allows for improvements in the downstream task of semi-supervised cross-dataset gaze estimation.

Disentanglement Gaze Estimation +1

Self-supervised Single-view 3D Reconstruction via Semantic Consistency

1 code implementation ECCV 2020 Xueting Li, Sifei Liu, Kihwan Kim, Shalini De Mello, Varun Jampani, Ming-Hsuan Yang, Jan Kautz

To the best of our knowledge, we are the first to try and solve the single-view reconstruction problem without a category-specific template mesh or semantic keypoints.

3D Reconstruction Object +1

Content-Consistent Generation of Realistic Eyes with Style

1 code implementation8 Nov 2019 Marcel Bühler, Seonwook Park, Shalini De Mello, Xucong Zhang, Otmar Hilliges

Accurately labeled real-world training data can be scarce, and hence recent works adapt, modify or generate images to boost target datasets.

Semantic Segmentation

Joint-task Self-supervised Learning for Temporal Correspondence

2 code implementations NeurIPS 2019 Xueting Li, Sifei Liu, Shalini De Mello, Xiaolong Wang, Jan Kautz, Ming-Hsuan Yang

Our learning process integrates two highly related tasks: tracking large image regions \emph{and} establishing fine-grained pixel-level associations between consecutive video frames.

Object Tracking Self-Supervised Learning +2

Learning Propagation for Arbitrarily-structured Data

no code implementations ICCV 2019 Sifei Liu, Xueting Li, Varun Jampani, Shalini De Mello, Jan Kautz

We experiment with semantic segmentation networks, where we use our propagation module to jointly train on different data -- images, superpixels and point clouds.

Point Cloud Segmentation Segmentation +2

Few-Shot Viewpoint Estimation

no code implementations13 May 2019 Hung-Yu Tseng, Shalini De Mello, Jonathan Tremblay, Sifei Liu, Stan Birchfield, Ming-Hsuan Yang, Jan Kautz

Through extensive experimentation on the ObjectNet3D and Pascal3D+ benchmark datasets, we demonstrate that our framework, which we call MetaView, significantly outperforms fine-tuning the state-of-the-art models with few examples, and that the specific architectural innovations of our method are crucial to achieving good performance.

Meta-Learning Viewpoint Estimation

Few-Shot Adaptive Gaze Estimation

1 code implementation ICCV 2019 Seonwook Park, Shalini De Mello, Pavlo Molchanov, Umar Iqbal, Otmar Hilliges, Jan Kautz

Inter-personal anatomical differences limit the accuracy of person-independent gaze estimation networks.

 Ranked #1 on Gaze Estimation on MPII Gaze (using extra training data)

Gaze Estimation Meta-Learning

Switchable Temporal Propagation Network

1 code implementation ECCV 2018 Sifei Liu, Guangyu Zhong, Shalini De Mello, Jinwei Gu, Varun Jampani, Ming-Hsuan Yang, Jan Kautz

Our approach is based on a temporal propagation network (TPN), which models the transition-related affinity between a pair of frames in a purely data-driven manner.

Video Compression

Light-weight Head Pose Invariant Gaze Tracking

no code implementations23 Apr 2018 Rajeev Ranjan, Shalini De Mello, Jan Kautz

Unconstrained remote gaze tracking using off-the-shelf cameras is a challenging problem.

Gaze Estimation Transfer Learning +1

Learning Affinity via Spatial Propagation Networks

no code implementations NeurIPS 2017 Sifei Liu, Shalini De Mello, Jinwei Gu, Guangyu Zhong, Ming-Hsuan Yang, Jan Kautz

Specifically, we develop a three-way connection for the linear propagation model, which (a) formulates a sparse transformation matrix, where all elements can be the output from a deep CNN, but (b) results in a dense affinity matrix that effectively models any task-specific pairwise similarity matrix.

Colorization Face Parsing +4

Learning Affinity via Spatial Propagation Network

no code implementations3 Oct 2017 Sifei Liu, Shalini De Mello, Jinwei Gu, Guangyu Zhong, Ming-Hsuan Yang, Jan Kautz

Specifically, we develop a three-way connection for the linear propagation model, which (a) formulates a sparse transformation matrix, where all elements can be the output from a deep CNN, but (b) results in a dense affinity matrix that effectively models any task-specific pairwise similarity matrix.

Colorization Face Parsing +4

Learning to Segment Instances in Videos with Spatial Propagation Network

no code implementations14 Sep 2017 Jingchun Cheng, Sifei Liu, Yi-Hsuan Tsai, Wei-Chih Hung, Shalini De Mello, Jinwei Gu, Jan Kautz, Shengjin Wang, Ming-Hsuan Yang

In addition, we apply a filter on the refined score map that aims to recognize the best connected region using spatial and temporal consistencies in the video.

Object Segmentation +1

Dynamic Facial Analysis: From Bayesian Filtering to Recurrent Neural Network

no code implementations CVPR 2017 Jinwei Gu, Xiaodong Yang, Shalini De Mello, Jan Kautz

We are inspired by the fact that the computation performed in an RNN bears resemblance to Bayesian filters, which have been used for tracking in many previous methods for facial analysis from videos.

 Ranked #1 on Head Pose Estimation on BIWI (MAE (trained with BIWI data) metric, using extra training data)

Face Alignment Feature Engineering +3

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