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In this paper we study the suitability of a new generation of CAPTCHA methods based on smartphone interactions. The heterogeneous flow of data generated during the interaction with the smartphones can be used to model human behavior when…

Cryptography and Security · Computer Science 2020-10-07 Alejandro Acien , Aythami Morales , Julian Fierrez , Ruben Vera-Rodriguez , Oscar Delgado-Mohatar

Learning from human demonstration is an effective approach for learning complex manipulation skills. However, existing approaches heavily focus on learning from passive human demonstration data for its simplicity in data collection.…

Robotics · Computer Science 2025-03-12 Philipp Wu , Yide Shentu , Qiayuan Liao , Ding Jin , Menglong Guo , Koushil Sreenath , Xingyu Lin , Pieter Abbeel

In teleoperation of contact-rich manipulation tasks, selecting robot impedance is critical but difficult. The robot must be compliant to avoid damaging the environment, but stiff to remain responsive and to apply force when needed. In this…

Effective error detection is crucial to prevent task disruption and maintain user trust. Traditional methods often rely on task-specific models or user reporting, which can be inflexible or slow. Recent research suggests social signals,…

Robotics · Computer Science 2025-01-14 Maia Stiber , Russell Taylor , Chien-Ming Huang

Automated traffic continued to surpass human-generated traffic on the web, and a rising proportion of this automation was explicitly malicious. Evasive bots could pretend to be real users, even solve Captchas and mimic human interaction…

Cryptography and Security · Computer Science 2026-02-11 Ghalia Jarad , Kemal Bicakci

This paper presents a human verification scheme in two independent stages to overcome the vulnerabilities of attacks and to enhance security. At the first stage, a hand image-based CAPTCHA (HandCAPTCHA) is tested to avert automated…

Computer Vision and Pattern Recognition · Computer Science 2024-10-15 Asish Bera , Debotosh Bhattacharjee , Hubert P H Shum

This study addresses the challenge of low dexterity in teleoperation tasks caused by limited sensory feedback and visual occlusion. We propose a novel approach that integrates haptic feedback into teleoperation using the adaptive triggers…

Contactless fingerprint recognition offers a higher level of user comfort and addresses hygiene concerns more effectively. However, it is also more vulnerable to presentation attacks such as photo paper, paper-printout, and various display…

Computer Vision and Pattern Recognition · Computer Science 2023-11-08 Banafsheh Adami , Nima Karimian

We present a robotic setup for real-world testing and evaluation of human-robot and human-human collaborative learning. Leveraging the sample-efficiency of the Soft Actor-Critic algorithm, we have implemented a robotic platform able to…

Robotics · Computer Science 2019-12-05 Jonas Tjomsland , Ali Shafti , A. Aldo Faisal

Protecting digital identities of human face from various attack vectors is paramount, and face anti-spoofing plays a crucial role in this endeavor. Current approaches primarily focus on detecting spoofing attempts within individual frames…

Computer Vision and Pattern Recognition · Computer Science 2024-06-07 Xiang Xu , Tianchen Zhao , Zheng Zhang , Zhihua Li , Jon Wu , Alessandro Achille , Mani Srivastava

This paper contributes a first study into how different human users deliver simultaneous control and feedback signals during human-robot interaction. As part of this work, we formalize and present a general interactive learning framework…

Artificial Intelligence · Computer Science 2017-03-16 Kory W. Mathewson , Patrick M. Pilarski

Robot-to-human object handover is an essential skill for robot assistants, from serving drinks at home to passing surgical tools in the operating room. We expect robots to perform handover robustly -- to release the object only after a firm…

Robotics · Computer Science 2026-05-07 Linfeng Li , Lin Shao , David Hsu

In this paper we evaluate mobile active authentication based on an ensemble of biometrics and behavior-based profiling signals. We consider seven different data channels and their combination. Touch dynamics (touch gestures and…

Cryptography and Security · Computer Science 2019-01-30 Alejandro Acien , Aythami Morales , Ruben Vera-Rodriguez , Julian Fierrez

The growing trend of using wearable devices for context-aware computing and pervasive sensing systems has raised its potentials for quick and reliable authentication techniques. Since personal writing habitats differ from each other, it is…

Human-Computer Interaction · Computer Science 2017-10-24 Qi Lyu , Zhifeng Kong , Chao Shen , Tianwei Yue

Chopsticks constitute a simple yet versatile tool that humans have used for thousands of years to perform a variety of challenging tasks ranging from food manipulation to surgery. Applying such a simple tool in a diverse repertoire of…

Among user authentication methods, behavioural biometrics has proven to be effective against identity theft as well as user-friendly and unobtrusive. One of the most popular traits in the literature is keystroke dynamics due to the large…

Computer Vision and Pattern Recognition · Computer Science 2022-10-05 Giuseppe Stragapede , Paula Delgado-Santos , Ruben Tolosana , Ruben Vera-Rodriguez , Richard Guest , Aythami Morales

Collecting human demonstrations via teleoperation is a common approach for teaching robots task-specific skills. However, when only a limited number of demonstrations are available, policies are prone to entering out-of-distribution (OOD)…

Robotics · Computer Science 2026-04-07 Rui Yan , Zaitian Gongye , Lars Paulsen , Xuxin Cheng , Xiaolong Wang

Behavioral biometrics-based continuous authentication is a promising authentication scheme, which uses behavioral biometrics recorded by built-in sensors to authenticate smartphone users throughout the session. However, current continuous…

Human-Computer Interaction · Computer Science 2026-01-08 Mingming Hu , Kun Zhang , Ruibang You , Bibo Tu

Tactile sensing is critical to fine-grained, contact-rich manipulation tasks, such as insertion and assembly. Prior research has shown the possibility of learning tactile-guided policy from teleoperated demonstration data. However, to…

Robotics · Computer Science 2025-02-07 Kelin Yu , Yunhai Han , Qixian Wang , Vaibhav Saxena , Danfei Xu , Ye Zhao

Pseudo-haptic techniques are becoming increasingly popular in human-computer interaction. They replicate haptic sensations by leveraging primarily visual feedback rather than mechanical actuators. These techniques bridge the gap between the…

Human-Computer Interaction · Computer Science 2024-07-04 Rui Xavier , José Luís Silva , Rodrigo Ventura , Joaquim Jorge
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