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Recognising actions in videos relies on labelled supervision during training, typically the start and end times of each action instance. This supervision is not only subjective, but also expensive to acquire. Weak video-level supervision…

Computer Vision and Pattern Recognition · Computer Science 2019-04-10 Davide Moltisanti , Sanja Fidler , Dima Damen

We introduce the Action Transformer model for recognizing and localizing human actions in video clips. We repurpose a Transformer-style architecture to aggregate features from the spatiotemporal context around the person whose actions we…

Computer Vision and Pattern Recognition · Computer Science 2019-05-20 Rohit Girdhar , João Carreira , Carl Doersch , Andrew Zisserman

From face recognition systems installed in phones to self-driving cars, the field of AI is witnessing rapid transformations and is being integrated into our everyday lives at an incredible pace. Any major failure in these system's…

Cryptography and Security · Computer Science 2020-12-14 Ayush Goel

The development in Artificial Intelligence (AI) offers transformative potential for redefining student assessment methodologies. This paper aims to establish the idea of the advancement of Artificial Intelligence (AI) and its prospect in…

Computers and Society · Computer Science 2025-03-10 Pushpalatha K S , Abhishek Mangalur , Ketan Hegde , Chetan Badachi , Mohammad Aamir

Nowadays, mobile devices have become the natural substitute for the digital camera, as they capture everyday situations easily and quickly, encouraging users to express themselves through images and videos. These videos can be shared across…

Cryptography and Security · Computer Science 2024-02-14 Carlos Quinto Huamán , Ana Lucila Sandoval Orozco , Luis Javier García Villalba

Machine learning models have demonstrated vulnerability to adversarial attacks, more specifically misclassification of adversarial examples. In this paper, we investigate an attack-agnostic defense against adversarial attacks on…

Computer Vision and Pattern Recognition · Computer Science 2022-03-07 Shuo Wang , Surya Nepal , Alsharif Abuadbba , Carsten Rudolph , Marthie Grobler

Developing a technique for the automatic analysis of surveillance videos in order to identify the presence of violence is of broad interest. In this work, we propose a deep neural network for the purpose of recognizing violent videos. A…

Computer Vision and Pattern Recognition · Computer Science 2017-09-20 Swathikiran Sudhakaran , Oswald Lanz

Transferable adversarial images raise critical security concerns for computer vision systems in real-world, black-box attack scenarios. Although many transfer attacks have been proposed, existing research lacks a systematic and…

Cryptography and Security · Computer Science 2025-09-17 Zhengyu Zhao , Hanwei Zhang , Renjue Li , Ronan Sicre , Laurent Amsaleg , Michael Backes , Qi Li , Qian Wang , Chao Shen

Deep learning models are vulnerable to adversarial examples, which can fool a target classifier by imposing imperceptible perturbations onto natural examples. In this work, we consider the practical and challenging decision-based black-box…

Machine Learning · Computer Science 2021-05-11 Qi-An Fu , Yinpeng Dong , Hang Su , Jun Zhu

Many video classification applications require access to personal data, thereby posing an invasive security risk to the users' privacy. We propose a privacy-preserving implementation of single-frame method based video classification with…

Cryptography and Security · Computer Science 2021-02-09 Sikha Pentyala , Rafael Dowsley , Martine De Cock

Standard adversarial attacks change the predicted class label of a selected image by adding specially tailored small perturbations to its pixels. In contrast, a universal perturbation is an update that can be added to any image in a broad…

Computer Vision and Pattern Recognition · Computer Science 2019-11-22 Ali Shafahi , Mahyar Najibi , Zheng Xu , John Dickerson , Larry S. Davis , Tom Goldstein

In this paper, a video service enhancement strategy is investigated under an edge-cloud collaboration framework, where video caching and delivery decisions are made in the cloud and edge respectively. We aim to guarantee the user fairness…

Multimedia · Computer Science 2021-03-24 Dapeng Wu , Ruili Bao , Zhidu Li , Honggang Wang , Ruyan Wang

Machine Learning systems are vulnerable to adversarial attacks and will highly likely produce incorrect outputs under these attacks. There are white-box and black-box attacks regarding to adversary's access level to the victim learning…

Machine Learning · Computer Science 2019-10-23 Saeid Samizade , Zheng-Hua Tan , Chao Shen , Xiaohong Guan

We propose a novel algorithm for weakly supervised semantic segmentation based on image-level class labels only. In weakly supervised setting, it is commonly observed that trained model overly focuses on discriminative parts rather than the…

Computer Vision and Pattern Recognition · Computer Science 2018-01-09 Seunghoon Hong , Donghun Yeo , Suha Kwak , Honglak Lee , Bohyung Han

Recent research has demonstrated that Deep Neural Networks (DNNs) are vulnerable to adversarial patches which introduce perceptible but localized changes to the input. Nevertheless, existing approaches have focused on generating adversarial…

Computer Vision and Pattern Recognition · Computer Science 2022-01-12 Kai Chen , Zhipeng Wei , Jingjing Chen , Zuxuan Wu , Yu-Gang Jiang

Deep learning based object detectors require thousands of diversified bounding box and class annotated examples. Though image object detectors have shown rapid progress in recent years with the release of multiple large-scale static image…

Computer Vision and Pattern Recognition · Computer Science 2018-10-05 Avisek Lahiri , Charan Reddy , Prabir Kumar Biswas

We study the problem of video-to-video synthesis, whose goal is to learn a mapping function from an input source video (e.g., a sequence of semantic segmentation masks) to an output photorealistic video that precisely depicts the content of…

Computer Vision and Pattern Recognition · Computer Science 2018-12-04 Ting-Chun Wang , Ming-Yu Liu , Jun-Yan Zhu , Guilin Liu , Andrew Tao , Jan Kautz , Bryan Catanzaro

Human action recognition and analysis have great demand and important application significance in video surveillance, video retrieval, and human-computer interaction. The task of human action quality evaluation requires the intelligent…

Computer Vision and Pattern Recognition · Computer Science 2022-04-21 Shunli Wang , Dingkang Yang , Peng Zhai , Qing Yu , Tao Suo , Zhan Sun , Ka Li , Lihua Zhang

Video compression plays a significant role in IoT devices for the efficient transport of visual data while satisfying all underlying bandwidth constraints. Deep learning-based video compression methods are rapidly replacing traditional…

Image and Video Processing · Electrical Eng. & Systems 2023-04-05 Jung-Woo Chang , Nojan Sheybani , Shehzeen Samarah Hussain , Mojan Javaheripi , Seira Hidano , Farinaz Koushanfar

Research of adversarial attacks is important for AI security because it shows the vulnerability of deep learning models and helps to build more robust models. Adversarial attacks on images are most widely studied, which include noise-based…

Cryptography and Security · Computer Science 2024-10-14 Xiaopei Zhu , Peiyang Xu , Guanning Zeng , Yingpeng Dong , Xiaolin Hu
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