Search Results for author: Nong Sang

Found 56 papers, 32 papers with code

Disentangling Spatial and Temporal Learning for Efficient Image-to-Video Transfer Learning

1 code implementation14 Sep 2023 Zhiwu Qing, Shiwei Zhang, Ziyuan Huang, Yingya Zhang, Changxin Gao, Deli Zhao, Nong Sang

When pre-training on the large-scale Kinetics-710, we achieve 89. 7% on Kinetics-400 with a frozen ViT-L model, which verifies the scalability of DiST.

Transfer Learning Video Recognition

HR-Pro: Point-supervised Temporal Action Localization via Hierarchical Reliability Propagation

1 code implementation24 Aug 2023 Huaxin Zhang, Xiang Wang, Xiaohao Xu, Zhiwu Qing, Changxin Gao, Nong Sang

For snippet-level learning, we introduce an online-updated memory to store reliable snippet prototypes for each class.

Temporal Action Localization

PLIP: Language-Image Pre-training for Person Representation Learning

1 code implementation15 May 2023 Jialong Zuo, Changqian Yu, Nong Sang, Changxin Gao

Extensive experiments demonstrate that our model not only significantly improves existing methods on all these tasks, but also shows great ability in the few-shot and domain generalization settings.

Pedestrian Attribute Recognition Person Re-Identification +3

MoLo: Motion-augmented Long-short Contrastive Learning for Few-shot Action Recognition

1 code implementation CVPR 2023 Xiang Wang, Shiwei Zhang, Zhiwu Qing, Changxin Gao, Yingya Zhang, Deli Zhao, Nong Sang

To address these issues, we develop a Motion-augmented Long-short Contrastive Learning (MoLo) method that contains two crucial components, including a long-short contrastive objective and a motion autodecoder.

Contrastive Learning Few-Shot action recognition +1

CLIP-guided Prototype Modulating for Few-shot Action Recognition

1 code implementation6 Mar 2023 Xiang Wang, Shiwei Zhang, Jun Cen, Changxin Gao, Yingya Zhang, Deli Zhao, Nong Sang

Learning from large-scale contrastive language-image pre-training like CLIP has shown remarkable success in a wide range of downstream tasks recently, but it is still under-explored on the challenging few-shot action recognition (FSAR) task.

Few-Shot action recognition Few Shot Action Recognition

Semantic Segmentation via Pixel-to-Center Similarity Calculation

no code implementations12 Jan 2023 Dongyue Wu, Zilin Guo, Aoyan Li, Changqian Yu, Changxin Gao, Nong Sang

Under this novel view, we propose a Class Center Similarity layer (CCS layer) to address the above-mentioned challenges by generating adaptive class centers conditioned on different scenes and supervising the similarities between class centers.

Semantic Segmentation

Learning a Condensed Frame for Memory-Efficient Video Class-Incremental Learning

no code implementations2 Nov 2022 Yixuan Pei, Zhiwu Qing, Jun Cen, Xiang Wang, Shiwei Zhang, Yaxiong Wang, Mingqian Tang, Nong Sang, Xueming Qian

The former is to reduce the memory cost by preserving only one condensed frame instead of the whole video, while the latter aims to compensate the lost spatio-temporal details in the Frame Condensing stage.

Action Recognition class-incremental learning +2

MAR: Masked Autoencoders for Efficient Action Recognition

1 code implementation24 Jul 2022 Zhiwu Qing, Shiwei Zhang, Ziyuan Huang, Xiang Wang, Yuehuan Wang, Yiliang Lv, Changxin Gao, Nong Sang

Inspired by this, we propose propose Masked Action Recognition (MAR), which reduces the redundant computation by discarding a proportion of patches and operating only on a part of the videos.

Action Classification Action Recognition +1

Context-aware Proposal Network for Temporal Action Detection

no code implementations18 Jun 2022 Xiang Wang, Huaxin Zhang, Shiwei Zhang, Changxin Gao, Yuanjie Shao, Nong Sang

This technical report presents our first place winning solution for temporal action detection task in CVPR-2022 AcitivityNet Challenge.

Action Classification Action Detection

Hybrid Relation Guided Set Matching for Few-shot Action Recognition

1 code implementation CVPR 2022 Xiang Wang, Shiwei Zhang, Zhiwu Qing, Mingqian Tang, Zhengrong Zuo, Changxin Gao, Rong Jin, Nong Sang

To overcome the two limitations, we propose a novel Hybrid Relation guided Set Matching (HyRSM) approach that incorporates two key components: hybrid relation module and set matching metric.

Few Shot Action Recognition set matching

Joint CNN and Transformer Network via weakly supervised Learning for efficient crowd counting

no code implementations12 Mar 2022 Fusen Wang, Kai Liu, Fei Long, Nong Sang, Xiaofeng Xia, Jun Sang

However, the transformer directly partitions the crowd images into a series of tokens, which may not be a good choice due to each pedestrian being an independent individual, and the parameter number of the network is very large.

Crowd Counting Weakly-supervised Learning

Multi-Centroid Representation Network for Domain Adaptive Person Re-ID

no code implementations22 Dec 2021 Yuhang Wu, Tengteng Huang, Haotian Yao, Chi Zhang, Yuanjie Shao, Chuchu Han, Changxin Gao, Nong Sang

First, we present a Domain-Specific Contrastive Learning (DSCL) mechanism to fully explore intradomain information by comparing samples only from the same domain.

Contrastive Learning Domain Adaptive Person Re-Identification +2

Modality-Aware Triplet Hard Mining for Zero-shot Sketch-Based Image Retrieval

1 code implementation15 Dec 2021 Zongheng Huang, Yifan Sun, Chuchu Han, Changxin Gao, Nong Sang

By combining two fundamental learning approaches in DML, e. g., classification training and pairwise training, we set up a strong baseline for ZS-SBIR.

Metric Learning Retrieval +1

Implicit Neural Deformation for Sparse-View Face Reconstruction

no code implementations5 Dec 2021 Moran Li, Haibin Huang, Yi Zheng, Mengtian Li, Nong Sang, Chongyang Ma

In this work, we present a new method for 3D face reconstruction from sparse-view RGB images.

3D Face Reconstruction

Unsupervised Low-Light Image Enhancement via Histogram Equalization Prior

1 code implementation3 Dec 2021 Feng Zhang, Yuanjie Shao, Yishi Sun, Kai Zhu, Changxin Gao, Nong Sang

We introduce a Noise Disentanglement Module (NDM) to disentangle the noise and content in the reflectance maps with the reliable aid of unpaired clean images.

 Ranked #1 on Low-Light Image Enhancement on MEF (NIQE metric)

Disentanglement Image Restoration +1

Attribute-specific Control Units in StyleGAN for Fine-grained Image Manipulation

1 code implementation25 Nov 2021 Rui Wang, Jian Chen, Gang Yu, Li Sun, Changqian Yu, Changxin Gao, Nong Sang

Image manipulation with StyleGAN has been an increasing concern in recent years. Recent works have achieved tremendous success in analyzing several semantic latent spaces to edit the attributes of the generated images. However, due to the limited semantic and spatial manipulation precision in these latent spaces, the existing endeavors are defeated in fine-grained StyleGAN image manipulation, i. e., local attribute translation. To address this issue, we discover attribute-specific control units, which consist of multiple channels of feature maps and modulation styles.

Image Manipulation

CondNet: Conditional Classifier for Scene Segmentation

2 code implementations21 Sep 2021 Changqian Yu, Yuanjie Shao, Changxin Gao, Nong Sang

The last layer of FCN is typically a global classifier (1x1 convolution) to recognize each pixel to a semantic label.

Scene Segmentation

ParamCrop: Parametric Cubic Cropping for Video Contrastive Learning

1 code implementation24 Aug 2021 Zhiwu Qing, Ziyuan Huang, Shiwei Zhang, Mingqian Tang, Changxin Gao, Marcelo H. Ang Jr, Rong Jin, Nong Sang

The visualizations show that ParamCrop adaptively controls the center distance and the IoU between two augmented views, and the learned change in the disparity along the training process is beneficial to learning a strong representation.

Contrastive Learning

OadTR: Online Action Detection with Transformers

1 code implementation ICCV 2021 Xiang Wang, Shiwei Zhang, Zhiwu Qing, Yuanjie Shao, Zhengrong Zuo, Changxin Gao, Nong Sang

Most recent approaches for online action detection tend to apply Recurrent Neural Network (RNN) to capture long-range temporal structure.

Online Action Detection

Weakly-Supervised Temporal Action Localization Through Local-Global Background Modeling

no code implementations20 Jun 2021 Xiang Wang, Zhiwu Qing, Ziyuan Huang, Yutong Feng, Shiwei Zhang, Jianwen Jiang, Mingqian Tang, Yuanjie Shao, Nong Sang

Then our proposed Local-Global Background Modeling Network (LGBM-Net) is trained to localize instances by using only video-level labels based on Multi-Instance Learning (MIL).

Weakly-supervised Learning Weakly-supervised Temporal Action Localization +1

A Stronger Baseline for Ego-Centric Action Detection

1 code implementation13 Jun 2021 Zhiwu Qing, Ziyuan Huang, Xiang Wang, Yutong Feng, Shiwei Zhang, Jianwen Jiang, Mingqian Tang, Changxin Gao, Marcelo H. Ang Jr, Nong Sang

This technical report analyzes an egocentric video action detection method we used in the 2021 EPIC-KITCHENS-100 competition hosted in CVPR2021 Workshop.

Action Detection

Hybrid attention network based on progressive embedding scale-context for crowd counting

no code implementations4 Jun 2021 Fusen Wang, Jun Sang, Zhongyuan Wu, Qi Liu, Nong Sang

In this paper, we propose a Hybrid Attention Network (HAN) by employing Progressive Embedding Scale-context (PES) information, which enables the network to simultaneously suppress noise and adapt head scale variation.

Crowd Counting

Temporal Context Aggregation Network for Temporal Action Proposal Refinement

1 code implementation CVPR 2021 Zhiwu Qing, Haisheng Su, Weihao Gan, Dongliang Wang, Wei Wu, Xiang Wang, Yu Qiao, Junjie Yan, Changxin Gao, Nong Sang

In this paper, we propose Temporal Context Aggregation Network (TCANet) to generate high-quality action proposals through "local and global" temporal context aggregation and complementary as well as progressive boundary refinement.

Action Detection Retrieval +2

Decoupled and Memory-Reinforced Networks: Towards Effective Feature Learning for One-Step Person Search

no code implementations22 Feb 2021 Chuchu Han, Zhedong Zheng, Changxin Gao, Nong Sang, Yi Yang

Specifically, to reconcile the conflicts of multiple objectives, we simplify the standard tightly coupled pipelines and establish a deeply decoupled multi-task learning framework.

Metric Learning Multi-Task Learning +2

Weakly Supervised Text-Based Person Re-Identification

1 code implementation ICCV 2021 Shizhen Zhao, Changxin Gao, Yuanjie Shao, Wei-Shi Zheng, Nong Sang

Specifically, to alleviate the intra-class variations, a clustering method is utilized to generate pseudo labels for both visual and textual instances.

Clustering Person Re-Identification +1

Exploiting Learnable Joint Groups for Hand Pose Estimation

1 code implementation17 Dec 2020 Moran Li, Yuan Gao, Nong Sang

This is different from the previous methods where all the joints are considered holistically and share the same feature.

Hand Pose Estimation Multi-Task Learning

Representative Graph Neural Network

no code implementations ECCV 2020 Changqian Yu, Yifan Liu, Changxin Gao, Chunhua Shen, Nong Sang

In this paper, we present a Representative Graph (RepGraph) layer to dynamically sample a few representative features, which dramatically reduces redundancy.

object-detection Object Detection +1

Multi-Level Temporal Pyramid Network for Action Detection

no code implementations7 Aug 2020 Xiang Wang, Changxin Gao, Shiwei Zhang, Nong Sang

By this means, the proposed MLTPN can learn rich and discriminative features for different action instances with different durations.

Action Detection

Temporal Fusion Network for Temporal Action Localization:Submission to ActivityNet Challenge 2020 (Task E)

no code implementations13 Jun 2020 Zhiwu Qing, Xiang Wang, Yongpeng Sang, Changxin Gao, Shiwei Zhang, Nong Sang

This technical report analyzes a temporal action localization method we used in the HACS competition which is hosted in Activitynet Challenge 2020. The goal of our task is to locate the start time and end time of the action in the untrimmed video, and predict action category. Firstly, we utilize the video-level feature information to train multiple video-level action classification models.

Action Classification Temporal Action Localization

Relevant Region Prediction for Crowd Counting

no code implementations20 May 2020 Xinya Chen, Yanrui Bin, Changxin Gao, Nong Sang, Hao Tang

The module builds a fully connected directed graph between the regions of different density where each node (region) is represented by weighted global pooled feature, and GCN is learned to map this region graph to a set of relation-aware regions representations.

Crowd Counting

Domain Adaptation for Image Dehazing

1 code implementation CVPR 2020 Yuanjie Shao, Lerenhan Li, Wenqi Ren, Changxin Gao, Nong Sang

By training image translation and dehazing network in an end-to-end manner, we can obtain better effects of both image translation and dehazing.

Domain Adaptation Image Dehazing +1

BiSeNet V2: Bilateral Network with Guided Aggregation for Real-time Semantic Segmentation

6 code implementations5 Apr 2020 Changqian Yu, Changxin Gao, Jingbo Wang, Gang Yu, Chunhua Shen, Nong Sang

We propose to treat these spatial details and categorical semantics separately to achieve high accuracy and high efficiency for realtime semantic segmentation.

Real-Time Semantic Segmentation

Context Prior for Scene Segmentation

2 code implementations CVPR 2020 Changqian Yu, Jingbo Wang, Changxin Gao, Gang Yu, Chunhua Shen, Nong Sang

Given an input image and corresponding ground truth, Affinity Loss constructs an ideal affinity map to supervise the learning of Context Prior.

Scene Segmentation Scene Understanding

GTNet: Generative Transfer Network for Zero-Shot Object Detection

1 code implementation19 Jan 2020 Shizhen Zhao, Changxin Gao, Yuanjie Shao, Lerenhan Li, Changqian Yu, Zhong Ji, Nong Sang

FFU and BFU add the IoU variance to the results of CFU, yielding class-specific foreground and background features, respectively.

object-detection Transfer Learning +1

Re-ID Driven Localization Refinement for Person Search

no code implementations ICCV 2019 Chuchu Han, Jiacheng Ye, Yunshan Zhong, Xin Tan, Chi Zhang, Changxin Gao, Nong Sang

The state-of-the-art methods train the detector individually, and the detected bounding boxes may be sub-optimal for the following re-ID task.

Person Re-Identification Person Search

Learning a Discriminative Feature Network for Semantic Segmentation

3 code implementations CVPR 2018 Changqian Yu, Jingbo Wang, Chao Peng, Changxin Gao, Gang Yu, Nong Sang

Most existing methods of semantic segmentation still suffer from two aspects of challenges: intra-class inconsistency and inter-class indistinction.

Semantic Segmentation Thermal Image Segmentation

Learning a Discriminative Prior for Blind Image Deblurring

no code implementations CVPR 2018 Lerenhan Li, Jinshan Pan, Wei-Sheng Lai, Changxin Gao, Nong Sang, Ming-Hsuan Yang

We present an effective blind image deblurring method based on a data-driven discriminative prior. Our work is motivated by the fact that a good image prior should favor clear images over blurred images. In this work, we formulate the image prior as a binary classifier which can be achieved by a deep convolutional neural network (CNN). The learned prior is able to distinguish whether an input image is clear or not. Embedded into the maximum a posterior (MAP) framework, it helps blind deblurring in various scenarios, including natural, face, text, and low-illumination images. However, it is difficult to optimize the deblurring method with the learned image prior as it involves a non-linear CNN. Therefore, we develop an efficient numerical approach based on the half-quadratic splitting method and gradient decent algorithm to solve the proposed model. Furthermore, the proposed model can be easily extended to non-uniform deblurring. Both qualitative and quantitative experimental results show that our method performs favorably against state-of-the-art algorithms as well as domain-specific image deblurring approaches.

Blind Image Deblurring Image Deblurring

Learning Scene-specific Object Detectors Based on a Generative-Discriminative Model with Minimal Supervision

no code implementations12 Nov 2016 Dapeng Luo, Zhipeng Zeng, Nong Sang, Xiang Wu, Longsheng Wei, Quanzheng Mou, Jun Cheng, Chen Luo

In this paper, the proposed framework takes a remarkably different direction to resolve the multi-scene detection problem in a bottom-up fashion.

object-detection Object Detection +1

Scene Text Detection via Holistic, Multi-Channel Prediction

no code implementations29 Jun 2016 Cong Yao, Xiang Bai, Nong Sang, Xinyu Zhou, Shuchang Zhou, Zhimin Cao

Recently, scene text detection has become an active research topic in computer vision and document analysis, because of its great importance and significant challenge.

Scene Text Detection Semantic Segmentation +1

Exemplar-based Linear Discriminant Analysis for Robust Object Tracking

no code implementations24 Feb 2014 Changxin Gao, Feifei Chen, Jin-Gang Yu, Rui Huang, Nong Sang

However, the task in tracking is to search for a specific object, rather than an object category as in detection.

Object Tracking

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