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Defending backdoor attacks in Federated Learning (FL) under heterogeneous client data distributions encounters limitations balancing effectiveness and privacy-preserving, while most existing methods highly rely on the assumption of…

Machine Learning · Computer Science 2025-10-14 Keke Gai , Dongjue Wang , Jing Yu , Liehuang Zhu , Qi Wu

Face anti-spoofing (FAS) plays a vital role in securing face recognition systems. Existing methods heavily rely on the expert-designed networks, which may lead to a sub-optimal solution for FAS task. Here we propose the first FAS method…

Computer Vision and Pattern Recognition · Computer Science 2020-11-05 Zitong Yu , Jun Wan , Yunxiao Qin , Xiaobai Li , Stan Z. Li , Guoying Zhao

Advances in deep learning, combined with availability of large datasets, have led to impressive improvements in face presentation attack detection research. However, state-of-the-art face antispoofing systems are still vulnerable to novel…

Computer Vision and Pattern Recognition · Computer Science 2021-08-30 Mohammad Rostami , Leonidas Spinoulas , Mohamed Hussein , Joe Mathai , Wael Abd-Almageed

In low-resource computing contexts, such as smartphones and other tiny devices, Both deep learning and machine learning are being used in a lot of identification systems. as authentication techniques. The transparent, contactless, and…

Computer Vision and Pattern Recognition · Computer Science 2023-05-02 Pangoth Santhosh Kumar , Garika Akshay

This paper presents a summary of the Competition on Face Presentation Attack Detection Based on Privacy-aware Synthetic Training Data (SynFacePAD 2023) held at the 2023 International Joint Conference on Biometrics (IJCB 2023). The…

Face Anti-Spoofing (FAS) remains challenging due to the requirement for robust domain generalization across unseen environments. While recent trends leverage Vision-Language Models (VLMs) for semantic supervision, these multimodal…

Computer Vision and Pattern Recognition · Computer Science 2026-04-22 Mika Feng , Pierre Gallin-Martel , Koichi Ito , Takafumi Aoki

Visual Anomaly Detection (VAD) is crucial for industrial inspection, yet most existing methods are limited to single-category scenarios, failing to address the multi-class and continual learning demands of real-world environments. While…

Computer Vision and Pattern Recognition · Computer Science 2026-03-19 Manuel Barusco , Davide Dalle Pezze , Francesco Borsatti , Gian Antonio Susto

While neural networks allow highly accurate predictions in many tasks, their lack of robustness towards even slight input perturbations often hampers their deployment. Adversarial attacks such as the seminal projected gradient descent (PGD)…

Computer Vision and Pattern Recognition · Computer Science 2024-07-09 Shashank Agnihotri , Steffen Jung , Margret Keuper

This paper analyzes the design choices of face detection architecture that improve efficiency of computation cost and accuracy. Specifically, we re-examine the effectiveness of the standard convolutional block as a lightweight backbone…

Computer Vision and Pattern Recognition · Computer Science 2023-11-03 Joonhyun Jeong , Beomyoung Kim , Joonsang Yu , Youngjoon Yoo

Deepfakes have emerged as a significant threat to digital media authenticity, increasing the need for advanced detection techniques that can identify subtle and time-dependent manipulations. CNNs are effective at capturing spatial artifacts…

Computer Vision and Pattern Recognition · Computer Science 2026-03-17 Aryan Thakre , Omkar Nagwekar , Vedang Talekar , Aparna Santra Biswas

Visual Place Recognition (VPR) requires robust retrieval of geotagged images despite large appearance, viewpoint, and environmental variation. Prior methods focus on descriptor fine-tuning or fixed sampling strategies yet neglect the…

Computer Vision and Pattern Recognition · Computer Science 2026-02-24 Shunpeng Chen , Changwei Wang , Rongtao Xu , Xingtian Pei , Yukun Song , Jinzhou Lin , Wenhao Xu , Jingyi Zhang , Li Guo , Shibiao Xu

An adversary can fool deep neural network object detectors by generating adversarial noises. Most of the existing works focus on learning local visible noises in an adversarial "patch" fashion. However, the 2D patch attached to a 3D object…

Computer Vision and Pattern Recognition · Computer Science 2022-05-17 Yexin Duan , Jialin Chen , Xingyu Zhou , Junhua Zou , Zhengyun He , Jin Zhang , Wu Zhang , Zhisong Pan

Iris-based biometric systems are vulnerable to presentation attacks (PAs), where adversaries present physical artifacts (e.g., printed iris images, textured contact lenses) to defeat the system. This has led to the development of various…

Computer Vision and Pattern Recognition · Computer Science 2025-04-28 Debasmita Pal , Redwan Sony , Arun Ross

Developing a face anti-spoofing model that meets the security requirements of clients worldwide is challenging due to the domain gap between training datasets and diverse end-user test data. Moreover, for security and privacy reasons, it is…

Computer Vision and Pattern Recognition · Computer Science 2025-04-01 Zhuowei Li , Tianchen Zhao , Xiang Xu , Zheng Zhang , Zhihua Li , Xuanbai Chen , Qin Zhang , Alessandro Bergamo , Anil K. Jain , Yifan Xing

Although deep models have greatly improved the accuracy and robustness of image segmentation, obtaining segmentation results with highly accurate boundaries and fine structures is still a challenging problem. In this paper, we propose a…

Computer Vision and Pattern Recognition · Computer Science 2021-05-12 Xuebin Qin , Deng-Ping Fan , Chenyang Huang , Cyril Diagne , Zichen Zhang , Adrià Cabeza Sant'Anna , Albert Suàrez , Martin Jagersand , Ling Shao

Deep neural networks are facing severe threats from adversarial attacks. Most existing black-box attacks fool target model by generating either global perturbations or local patches. However, both global perturbations and local patches…

Computer Vision and Pattern Recognition · Computer Science 2022-10-18 Chao Zhou , Yuan-Gen Wang , Guopu Zhu

Multi-modal face anti-spoofing (FAS) aims to detect genuine human presence by extracting discriminative liveness cues from multiple modalities, such as RGB, infrared (IR), and depth images, to enhance the robustness of biometric…

Computer Vision and Pattern Recognition · Computer Science 2025-07-09 Jun-Xiong Chong , Fang-Yu Hsu , Ming-Tsung Hsu , Yi-Ting Lin , Kai-Heng Chien , Chiou-Ting Hsu , Pei-Kai Huang

Document Presentation Attack Detection (DPAD) is an important measure in protecting the authenticity of a document image. However, recent DPAD methods demand additional resources, such as manual effort in collecting additional data or…

Computer Vision and Pattern Recognition · Computer Science 2024-11-25 Changsheng Chen , Yongyi Deng , Liangwei Lin , Zitong Yu , Zhimao Lai

This chapter provides an introduction to Presentation Attack Detection (PAD) in fingerprint biometrics, also coined anti-spoofing, describes early developments in this field, and briefly summarizes recent trends and open issues.

Cryptography and Security · Computer Science 2023-04-17 Javier Galbally , Julian Fierrez , Raffaele Cappelli , Gian Luca Marcialis

In a spoofing attack, a malicious actor impersonates a legitimate user to access or manipulate data without authorization. The vulnerability of cryptographic security mechanisms to compromised user credentials motivates spoofing attack…

Signal Processing · Electrical Eng. & Systems 2024-01-17 Tien Ngoc Ha , Daniel Romero
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