Anil Ufuk Batmaz

Anil Ufuk Batmaz
Kadir Has University | KHU · Mechatronics Engineering

Doctor of Philosophy
Assistant Professor @Kadir Has University VR\AR enthusiast, HCI researcher

About

42
Publications
8,501
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368
Citations

Publications

Publications (42)
Conference Paper
Full-text available
Jitter, small fluctuations in the signal, is one of the major sources for a decrease in motor performance and a negative user experience in virtual reality (VR) systems. Current technologies still cannot eliminate jitter in VR systems, especially in the eye-gaze tracking systems embedded in many head-mounted displays. In this work, we used an HTC V...
Chapter
Augmented reality systems show virtual object models overlaid over real ones, which is helpful in many contexts, e.g., during maintenance. Assuming all geometry is known, misalignments in 3D poses will still occur without perfectly robust viewer and object 3D tracking. Such misalignments can impact the user experience and reduce the potential benef...
Conference Paper
Full-text available
While a pinch action is gaining popularity for selection of virtual objects in eye-gaze-based systems, it is still unknown how well this method performs compared to other popular alternatives, e.g., a button click or a dwell action. To determine pinch’s performance in terms of execution time, error rate, and throughput, we implemented a Fitts’ law...
Chapter
Virtual Reality (VR) 3D tracking systems are susceptible to minor fluctuations in signal (jitter). In this study, we explored how different levels of jitter affect user performance for 3D pointing. We designed a Fitts’ Law experiment investigating target positional jitter and cursor rotational jitter at three different depth distances. Performance...
Article
Full-text available
Telepresence robots allow users to be spatially and socially present in remote environments. Yet, it can be challenging to remotely operate telepresence robots, especially in dense environments such as academic conferences or workplaces. In this paper, we primarily focus on the effect that a speed control method, which automatically slows the telep...
Conference Paper
Full-text available
Eye-hand coordination training systems are used to improve user performance during fast movements in sports training. In this work, we explored gaze tracking in a Virtual Reality (VR) sports training system with a VR headset. Twelve subjects performed a pointing study with or without passive haptic feedback. Results showed that subjects spent an av...
Conference Paper
Full-text available
Previous research on eye-hand coordination training systems has investigated user performance on a wall, 2D touchscreens, and in Virtual Reality (VR). In this paper, we designed an eye-hand coordination reaction test to investigate and compare user performance in three different virtual environments (VEs)-VR, Augmented Reality (AR), and a 2D touchs...
Conference Paper
Full-text available
While commercial Virtual Reality (VR) controllers are mostly designed to be held in a power grip, previous research showed that using pen-like devices with a precision grip can improve user performance for selection in VR, potentially even matching that achievable with a mouse. However, it is not known if the improvement is due to the grip style. I...
Conference Paper
Reaction time training systems are used to improve user performance. Until now, such setups use physical 2D flat surfaces, e.g., a 2D touch screen or buttons mounted on a wall. We designed and investigated a mid-air reaction time training system with an immersive virtual reality (VR) headset. 12 participants performed an eye-hand coordination react...
Poster
Even when in a static position, data acquired from 6 Degrees of Freedom (DoF) trackers is affected by noise, which is typically called jitter. In this study, we analyzed the effects of 3D rotational jitter on Virtual Reality (VR) controllers in a 3D Fitts’ law experiment, which explored how such jitter affects user performance. Eight subjects perfo...
Conference Paper
Even when in a static position, data acquired from 6 Degrees of Freedom (DoF) trackers is affected by noise, which is typically called jitter. In this study, we analyzed the effects of 3D rotational jitter on Virtual Reality (VR) controllers in a 3D Fitts' law experiment, which explored how such jitter affects user performance. Eight subjects perfo...
Article
We studied the influence of sound feed-back signals, with eight frequencies between low and high, on the time and precision of target-specific finger movements along visually presented trajectories in an image guided task. Subjects performed the finger movements with their dominant and non-dominant hands along variable directions. The results show...
Conference Paper
Full-text available
Most AR and VR headsets use stereoscopic displays to show virtual objects in 3D. However, the limitations of current stereo display systems affect depth perception through conflicting depth cues, which then also affect virtual hand interaction in peri-personal space, i.e., within arm’s reach. We performed a Fitts’ law experiment to better understan...
Conference Paper
3D pointing is an integral part of Virtual Reality interaction. Typical pointing devices rely on 3D trackers and are thus subject to fluctuations in the reported pose, i.e., jitter. In this work, we explored how different levels of rotational jitter affect pointing performance and if different selection methods can mitigate the effects of jitter. T...
Thesis
Perceptual system of a surgeon must adapt to conditions of multisensorial constrains regard to planning, control, and execution of the image-guided surgical operations. Three experimental setups are designed to explore these visual and haptic constraints in the image-guided training. Results show that subjects are faster and more precise with direc...
Conference Paper
Full-text available
The effective design of virtual reality (VR) simulators requires a deeper understanding of VR mediated human actions such as hand movements, with specifically tailored experiments testing how different design parameters affect performance. The present experiment investigates the time and precision of hand (index finger) movements under varying cond...
Article
Full-text available
In image-guided surgical tasks, the precision and timing of hand movements depend on the effectiveness of visual cues relative to specific target areas in the surgeon's peri-personal space. Two-dimensional (2D) image views of real-world movements are known to negatively affect both constrained (with tool) and unconstrained (no tool) hand movements...
Article
In a virtual reality scene, object location is important when aimed at interaction with a user. The spatial position of a virtual target can affect motor performance for ipsilateral and contralateral manual operations. To test for this effect, an Oculus DK2 Virtual Reality Head Mounted Set was used with a Leap Motion hand tracking system. 22 sticks...
Article
Full-text available
Effects of different visual displays on the time and precision of bare-handed or tool-mediated eye-hand coordination were investigated in a pick-and-place-task with complete novices. All of them scored well above average in spatial perspective taking ability and performed the task with their dominant hand. Two groups of novices, four men and four w...
Data
Raw data for 'time' and 'precision' from the two study groups. The column headings in thistable (excel spreadsheet) are as follows: A and H show labels for the four viewing conditions; B and I show labels for the two manipulation conditions; C and J show labels for the two session conditions; D and K show labels for the two gender conditions; E and...
Conference Paper
Full-text available
STRAS (Single access Transluminal Robotic Assistant for Surgeons) is a flexible robotic system based on the Anubis® platform of Karl Storz for application to intraluminal procedures. It consists of three cable-driven systems, one endoscope serving as guide and two inserted instruments. The flexible and bendable instruments have three degrees of fre...
Article
Full-text available
Background: The speed and precision with which objects are moved by hand or hand-tool interaction under image guidance depend on a specific type of visual and spatial sensorimotor learning. Novices have to learn to optimally control what their hands are doing in a real-world environment while looking at an image representation of the scene on a vid...
Article
A current approach for surgical imaging is to employ a single camera with a fisheye lens, the latter providing a hemispherical focus of vision with poor off-axis resolution and aberrant shape contrast effects at the edges of objects viewed on the screen. We built an experimental platform for testing effects of fisheye screen representations of a Ge...
Article
Full-text available
Transceiver characteristics, asymmetric interference, and various properties of electromagnetic propagation environment create unidirectional links in Wireless Sensor Networks (WSNs), especially in extreme environments. Utilization of unidirectional links is shown to improve network connectivity and lifetime. In practical WSNs, link level data exch...
Conference Paper
Full-text available
The occurrence of unidirectional links in wireless sensor networks (WSNs) is an inherent feature of wireless communication. Transceiver characteristics, asymmetric interference, and many other properties of the electromagnetic propagation environment result in link unidirectionality, however, transmission power heterogeneity is the dominant factor...
Conference Paper
Full-text available
In current literature, Unmanned Aerial Vehicles (UAVs), especially quadrotors, is one of the hot topics of study which has numerous applications. This paper focuses on modeling the quadrotor in order to improve the empirical results. The procedure consists of four stages: 1) Experimental determination of controller coefficients, 2) Data collection,...
Conference Paper
Full-text available
Most of the data transfer mechanisms designed for wireless sensor networks (WSNs) work only on bidirectional links, yet, there are some mechanisms capable of utilizing unidirectional links which have been caused by transmission power heterogeneity. Employment of a multi-hop reverse path for acknowledgement delivery is the key concept in these desig...
Article
Full-text available
Unmanned Aerial Vehicles (UAVs) are currently one of the hot topics of study which have numerous applications such as remote sensing, aerial surveillance, exploration, search and rescue, transport, scientific research and armed attacks. In this work we consider a test-bed for the design of a low cost flight controller for a quadrotor and we demonst...
Article
Full-text available
Unmanned Aerial Vehicles (UAVs), specifically quadrotors, is one of the major topics of study in current literature with applications to numerous fields. In this paper we consider a test-bed for the design of a low cost flight controller for a quadrotor and as a first step in design we demonstrate the design of the roll controller on an experimenta...

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Projects

Projects (3)
Archived project
This project was funded by the Excellence Cluster of Strasbourg University (IDEX) after selection of the project (Principal Investigator: B DRESP-LANGLEY) by international expert reviewers in 2015. The funding permitted us to hire Anil Ufuk BATMAZ as a doctoral student in 2015. He successfully defended his thesis at the University of Strasbourg's Life Sciences Doctoral School in 2018. Dr. Batmaz is now Associate Professor at a major University of his country of origin after two years as a post-doctoral researcher in Canada. In 2020, the funding permitted us to hire Dr. Rongrong LIU on a post-doctoral position for one year. Dr. Liu is now a Research Fellow at the University of Pisa's Scuola Normale Superiore St. Anna's Robotics Laboratory. The project goal, in line with previously published work by ourselves and others, was to build a novel eye-hand coordination and grip force analysis (hardware and software) station, inspired by the previous prototype developed by Batmaz et al. in 2017 within the context of an improved technological platform (Dr. Philippe ZANNE, CNRS Research Engineer) for robot-assisted, or not, image-guided precision tasks such as single-access transluminal endoscopic surgery. The new workstation was to permit individual spatio-temporal grip force profiling in real time to track the evolution of precision task skills in surgeons and novices with varying levels of task expertise. The project was carried out in collaboration with Professors NAGEOTTE and DE MATHELIN at the Medical Robotics Department of ICube Laboratory UMR 7357 CNRS-Strasbourg University.
Project
To better understand how people select objects using virtual hand on stereo displays
Project
Supervisor = Birgitta Dresp-Langley Co-supervisor = Michel de Mathelin We study the speed, the accuracy and the object movement trajectory of human operators performing tasks in real world space, single-handed or with their two hands and using tools or not, under varying conditions of visual input or absence thereof. The project aims at a deeper understanding of functional aspects of sensory learning, integration, and plasticity with tight links to current technological challenges in the fields of image-guided surgery and robotics