Stefan Kohlbecher

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The prototype of a gaze-controlled, head-mounted camera (EyeSeeCam) was developed that provides the functionality for fundamental studies on human gaze behavior even under dynamic conditions like locomotion. EyeSeeCam incorporates active visual exploration by saccades with image stabilization during head, object, and surround motion just as occurs in human(More)
Most video-based eye trackers require a calibration procedure before measurement onset. In this work a stereo approach is presented that yields the position and orientation of the pupil in 3D space. This is achieved by analyzing the pupil images of two calibrated cameras and by a subsequent closed-form stereo reconstruction of the original pupil surface.(More)
Head impulses are a routine clinical test of semicircular canal function. At the bedside, they are used to detect malfunctioning of the horizontal semicircular canals. So far, 3-D-search-coil recording is required to reliably test anterior and posterior canal function and to determine the gain of the vestibulo-ocular reflex (VOR). Search-coil recording(More)
The analysis of cognitive processes during human-machine and human-human interaction requires various tracking technologies. The human gaze is a very important cue to gather information concerning the user's intentions, current mental state, etc. To get this data the framework consisting of a highly accurate head-mounted gaze tracker combined with a low(More)
A novel paradigm for the evaluation of humanrobot interaction is proposed, with special focus on the importance of natural eye and head movements in nonverbal human-machine communication scenarios. We present an experimental platform that will enable Wizard-of-Oz experiments in which a human experimenter (wizard) teleoperates a robotic head and eyes with(More)
We have developed a low-latency combined eye and head tracker suitable for teleoperating a remote robotic head in real-time. Eye and head movements of a human (wizard) are tracked and replicated by the robot with a latency of 16.5 ms. The tracking is achieved by three fully synchronized cameras attached to a head mount. One forward-looking, wide-angle(More)
This contribution presents an approach for representing contact-analog information in an automotive Head-Up Display (HUD). Therefore, we will firstly introduce our approach for the calibration of the optical system consisting of the virtual image plane of the HUD and the drivers eyes. Afterward, we will present the used eyetracking system for adaptation of(More)
Development of accurate Situation Awareness (SA) depends on experience and may be impaired during excessive workload. In order to gain adequate SA for decision making and performance, anaesthetists need to distribute visual attention effectively. Therefore, we hypothesized that in more experienced anaesthetists performance is better and increase of(More)
The current trend toward robot assistants and the execution of autonomous tasks in minimally invasive surgery increases the operation complexity of telepresence systems. The available input channels are currently limited to traditional human-computer interfaces. We introduce two human-robot interfacing modalities that aim to make robotic surgery more(More)
In this paper, a platform for studying human-robot interaction is presented. Apart from presenting a robotic eye module, which exceeds human performance in terms of velocity and acceleration, we introduce a novel method of controlling a robot‘s head and eye movements. In a Wizard-of-Oz scenario, a human operator (the wizard) perceives the world from the(More)