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A robust and efficient anomaly detection technique is proposed, capable of dealing with crowded scenes where traditional tracking based approaches tend to fail. Initial foreground segmentation of the input frames confines the analysis to…

Computer Vision and Pattern Recognition · Computer Science 2013-04-04 Vikas Reddy , Conrad Sanderson , Brian C. Lovell

Clustering high-dimensional spatiotemporal data using an unsupervised approach is a challenging problem for many data-driven applications. Existing state-of-the-art methods for unsupervised clustering use different similarity and distance…

Machine Learning · Computer Science 2023-09-15 Omar Faruque , Francis Ndikum Nji , Mostafa Cham , Rohan Mandar Salvi , Xue Zheng , Jianwu Wang

Domain shift across crowd data severely hinders crowd counting models to generalize to unseen scenarios. Although domain adaptive crowd counting approaches close this gap to a certain extent, they are still dependent on the target domain…

Computer Vision and Pattern Recognition · Computer Science 2023-03-29 Zhipeng Du , Jiankang Deng , Miaojing Shi

Crowd density level estimation is an essential aspect of crowd safety since it helps to identify areas of probable overcrowding and required conditions. Nowadays, AI systems can help in various sectors. Here for safety purposes or many for…

Cryptography and Security · Computer Science 2024-05-14 Mahira Arefin , Md. Anwar Hussen Wadud , Anichur Rahman

Crowd counting is an important task in computer vision, which has many applications in video surveillance. Although the regression-based framework has achieved great improvements for crowd counting, how to improve the discriminative power…

Computer Vision and Pattern Recognition · Computer Science 2016-05-02 Biyun Sheng , Chunhua Shen , Guosheng Lin , Jun Li , Wankou Yang , Changyin Sun

Detecting extreme events in large datasets is a major challenge in climate science research. Current algorithms for extreme event detection are build upon human expertise in defining events based on subjective thresholds of relevant…

Computer Vision and Pattern Recognition · Computer Science 2016-05-05 Yunjie Liu , Evan Racah , Prabhat , Joaquin Correa , Amir Khosrowshahi , David Lavers , Kenneth Kunkel , Michael Wehner , William Collins

Crowd localization is a new computer vision task, evolved from crowd counting. Different from the latter, it provides more precise location information for each instance, not just counting numbers for the whole crowd scene, which brings…

Computer Vision and Pattern Recognition · Computer Science 2021-08-03 Junyu Gao , Maoguo Gong , Xuelong Li

Precise knowledge about the size of a crowd, its density and flow can provide valuable information for safety and security applications, event planning, architectural design and to analyze consumer behavior. Creating a powerful machine…

Computer Vision and Pattern Recognition · Computer Science 2019-06-19 Mahdi Maktabdar Oghaz , Anish R Khadka , Vasileios Argyriou , Paolo Remagnino

In this work, we propose a novel crowd counting network that progressively generates crowd density maps via residual error estimation. The proposed method uses VGG16 as the backbone network and employs density map generated by the final…

Computer Vision and Pattern Recognition · Computer Science 2019-10-29 Vishwanath A. Sindagi , Rajeev Yasarla , Vishal M. Patel

Detecting and Counting people in a human crowd from a moving drone present challenging problems that arisefrom the constant changing in the image perspective andcamera angle. In this paper, we test two different state-of-the-art approaches,…

Computer Vision and Pattern Recognition · Computer Science 2022-03-01 Javier Gonzalez-Trejo , Diego Mercado-Ravell

State-of-the-art methods for counting people in crowded scenes rely on deep networks to estimate crowd density in the image plane. While useful for this purpose, this image-plane density has no immediate physical meaning because it is…

Computer Vision and Pattern Recognition · Computer Science 2019-07-19 Weizhe Liu , Krzysztof Lis , Mathieu Salzmann , Pascal Fua

In crowd counting, due to the problem of laborious labelling, it is perceived intractability of collecting a new large-scale dataset which has plentiful images with large diversity in density, scene, etc. Thus, for learning a general model,…

Computer Vision and Pattern Recognition · Computer Science 2021-08-19 Binghui Chen , Zhaoyi Yan , Ke Li , Pengyu Li , Biao Wang , Wangmeng Zuo , Lei Zhang

Counting people in dense crowds is a demanding task even for humans. This is primarily due to the large variability in appearance of people. Often people are only seen as a bunch of blobs. Occlusions, pose variations and background clutter…

Computer Vision and Pattern Recognition · Computer Science 2018-07-30 Deepak Babu Sam , R. Venkatesh Babu

Autonomous vehicle navigation in shared pedestrian environments requires the ability to predict future crowd motion both accurately and with minimal delay. Understanding the uncertainty of the prediction is also crucial. Most existing…

Computer Vision and Pattern Recognition · Computer Science 2020-11-24 Kunming Li , Stuart Eiffert , Mao Shan , Francisco Gomez-Donoso , Stewart Worrall , Eduardo Nebot

The rapid development in visual crowd analysis shows a trend to count people by positioning or even detecting, rather than simply summing a density map. It also enlightens us back to the essence of the field, detection to count, which can…

Computer Vision and Pattern Recognition · Computer Science 2021-10-12 Qi wang , Tao Han , Junyu Gao , Yuan Yuan , Xuelong Li

Dense crowd counting aims to predict thousands of human instances from an image, by calculating integrals of a density map over image pixels. Existing approaches mainly suffer from the extreme density variances. Such density pattern shift…

Computer Vision and Pattern Recognition · Computer Science 2019-08-09 Chenfeng Xu , Kai Qiu , Jianlong Fu , Song Bai , Yongchao Xu , Xiang Bai

In this paper, we propose a novel self-training approach named Crowd-SDNet that enables a typical object detector trained only with point-level annotations (i.e., objects are labeled with points) to estimate both the center points and sizes…

Computer Vision and Pattern Recognition · Computer Science 2021-02-19 Yi Wang , Junhui Hou , Xinyu Hou , Lap-Pui Chau

Deep learning models have been widely used for anomaly detection in surveillance videos. Typical models are equipped with the capability to reconstruct normal videos and evaluate the reconstruction errors on anomalous videos to indicate the…

Computer Vision and Pattern Recognition · Computer Science 2022-11-08 Xianlin Zeng , Yalong Jiang , Wenrui Ding , Hongguang Li , Yafeng Hao , Zifeng Qiu

Detection-based methods have been viewed unfavorably in crowd analysis due to their poor performance in dense crowds. However, we argue that the potential of these methods has been underestimated, as they offer crucial information for crowd…

Computer Vision and Pattern Recognition · Computer Science 2023-08-31 Shaokai Wu , Fengyu Yang

Traffic flow prediction is crucial for urban traffic management and public safety. Its key challenges lie in how to adaptively integrate the various factors that affect the flow changes. In this paper, we propose a unified neural network…

Machine Learning · Computer Science 2018-09-05 Lingbo Liu , Ruimao Zhang , Jiefeng Peng , Guanbin Li , Bowen Du , Liang Lin