Smart Physical Training in Virtual Reality
Cluster of Excellence CITEC is developing a system to support athletes and patients in physical rehabilitation
A new system in a virtual training room is helping users practice and improve sports exercises and other motor activities: six research groups from the Cluster of Excellence Cognitive Interaction Technology (CITEC) at Bielefeld University are working on the ICSPACE project to develop this virtual coaching space. CITEC is funding this large-scale research project with 1.6 million Euro and it will run until 2017. During a project presentation the researchers showcased what their system is capable of. Using the example of a squat exercise, they presented the new technology, which will help not only athletes, but also physical rehabilitation patients learn movement exercises and correct their mistakes. In a new “research_TV” report from Bielefeld University, the coordinators of the project also explain how their new system works.
When the user enters into the system, the first thing she sees is a virtual image of herself in the mirror of the virtual coaching space. “With the virtual image in the mirror, users can visually watch themselves and check how they are performing the exercises,” explains Professor Dr. Mario Botsch. The computer scientist heads the project together with computer scientist Professor Dr. Stefan Kopp and sport and cognitive scientist Professor Dr. Thomas Schack. Participating research groups on this large-scale project come from a wide range of disciplinary backgrounds, including biology, psychology, sports science, linguistics, and computer science.
To generate the image in the virtual mirror, the participant's appearance is 3D-scanned in advance and transferred onto an artificial figure, an avatar. “In the virtual mirror, the user doesn’t just see herself from the front. The mirror can be turned, on demand, in order to see oneself from another side, which allows the user to better judge if the exercise is being performed correctly,” says Botsch, an expert in computer graphics. “With the help of virtual technology, things can be visualized that normally could not be seen,” says Stefan Kopp. Because of this, what is depicted in the virtual mirror – much in contrast to a real mirror – can be modified. “We can give the user visual training cues, such as highlighting individual body parts in color in the mirror,” says the cognitive scientist Kopp. When a user goes down while doing a squat, for instance, the thighs on her avatar appear red until she moves into the correct end position. The system also points out mistakes: “Certain mistakes made during movement exercises, such as bending one’s neck too far during a squat, are depicted in the mirror in an exaggerated way so as to draw attention to the error.” Users can also see a demonstration of the exercise: An additional half-transparent figure is overlaid on the user’s avatar in the mirror and performs the exercise together with the respective user. “The user can then simply follow the movements made by this second figure, which enables her to learn the correct sequence of movements,” says Kopp.
According to sport and cognitive scientist Thomas Schack, this training environment is the first of its kind in the world. “It is the only system I know of that, in comparison to other virtual systems, simulates and implements the technology of the entire training process, while at the same time adapting flexibly to the user’s actions,” says Schack. “Demonstrating exercises through modeling is part of this process. These models allow the individual exercises to be described and understood, but also serve as objectives for the coach and feedback for the user.” Looking ahead, the researchers would like to use this virtual coaching space to investigate how technical systems can best assist in practicing and performing sports exercises and other motor skills.
In the future, the new system is planned to be able to teach much more than just how to do a squat. “The planned range of activities will include gymnastics exercises, tai chi, yoga, or, for example, how to swing a golf club,” says Schack. In addition to athletes, this system is also appropriate for patients in physical rehabilitation. As Mario Botsch explains, “The system is suitable for coaching high-performance athletics, as well as for therapeutic approaches – for example, treating mobility problems due to an illness.”
The researchers believe that ICSPACE complements existing offerings in sports coaching. “We don’t want to put any coaches out of business,” says Mario Botsch. “But there is considerably more demand for motor learning than one might think. The technologies we are developing are also suitable for motivating elderly people to get active, and to this end the system could be scaled-down to even work at home on a Smart-TV.”
For more information online, please see:
• Video report on ICSPACE from research_tv [English subtitle]: www.youtube.com/watch?v=WDZ4Zgv_wzQ
• Overview of the major CITEC project ICSPACE: graphics.uni-bielefeld.de/research/icspace
• Overview of research projects at CITEC: cit-ec.de/en/content/projects
Prof. Dr. Mario Botsch, Bielefeld University
Faculty of Technology
Telephone: +49 521 106-12146