Abstract
Abstract. The paper gives an overview about two research projects, both dealing with optical head tracking in hearing applications. As part of the project “Development of a real-time low-cost tracking system for medical and audiological problems (ELCoT)” a cost-effective single camera 3D tracking system has been developed which enables the detection of arm and head movements of human patients. Amongst others, the measuring system is designed for a new hearing test (based on the “Mainzer Kindertisch”), which analyzes the directional hearing capabilities of children in cooperation with the research project ERKI (Evaluation of acoustic sound source localization for children). As part of the research project framework “Hearing in everyday life (HALLO)” a stereo tracking system is being used for analyzing the head movement of human patients during complex acoustic events. Together with the consideration of biosignals like skin conductance the speech comprehension and listening effort of persons with reduced hearing ability, especially in situations with background noise, is evaluated. For both projects the system design, accuracy aspects and results of practical tests are discussed.
Highlights
Video-based tracking methods have been applied in a lot of different fields for many years
The task of the research project ELCoT was to develop a low-cost 3D measurement system for detection of head and arm movements in real time, which can be applied to new hearing tests in the cooperative project ERKI
Hearing impaired people often have problems concentrating in a conversation as they are distracted by other speakers or noise sources e. g. in a cafeteria
Summary
Video-based tracking methods have been applied in a lot of different fields for many years. The tracking and capture of body movements using cameras is often subsumed by the term motion capture. Applications of this technology can be found in medicine, robotics and in the entertainment industry for computer animation and motion capture for video games and movies. Available tracking systems differ significantly in measuring accuracy, tracking frequency, measurement volume, costs and other specifications. The achievable measuring volume depends on various factors such as sensor resolution, focal length, image scale and the numbers of used cameras. It can be said that at constant conditions for the image scale, a larger volume can be achieved if the aperture angle is larger and the appropriate configuration uses more cameras
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