Development of an Autonomous Character in Karate Kumite

Petri, Katharina; Witte, Kerstin; Bandow, Nicole; Emmermacher, Peter; Masik, Steffen; Dannenberg, Marco; Salb, Simon; Zhang, Liang; Brunnett, Guido

doi:10.1007/978-3-319-67846-7_13

Cited by 10 publications

(31 citation statements)

References 37 publications

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“…All exercise studies using autonomous VCs are based on decision systems (Hülsmann et al, 2016), or are created on the basis of competition analysis and in consultation with expert coaches (e.g. Petri et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

“…With regard to the use of autonomous VCs, we only found plans to use these systems in anticipation research in the future, but no specific studies exist until now (Petri et al, 2017, Zhang et al, 2018. Argelaguet Sanz, Multon & Lécuyer (2015) use an autonomous VE to analyze anxiety and pressure considering two scenarios: training (no stress) and competition (stress by loud audience).…”

Section: Resultsmentioning

confidence: 99%

“…The first autonomous virtual coach was made available 2015 by de Kok and coworkers. Petri et al (2017) and Zhang et al (2018) developed the first autonomous opponent which can perform an adequate attack against a moving athlete. Previous autonomous VCs were created using a prediction system (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Nowadays, a growing amount of studies is available using HMDs, due to having less weight and being cheaper since they reached commercial availability (Fernandez & Feiner, 2016). Petri et al (2017) showed that HMDs are preferred by karate athletes compared to CAVEs, as with HMD there is more space to move. Chua et al (2003) even recommend wireless HMDs for less obstruction of movement executions and less accidents by falling over cables.…”

Section: Which Visualization Devices Are Used In Sport Related Virtuamentioning

confidence: 99%

“…In three studies only some body parts, in all cases the hands, were visualized (e.g. Petri et al, 2017). Further, there are four VEs available, which virtualize sports equipment.…”

Section: Which Visualization Devices Are Used In Sport Related Virtuamentioning

confidence: 99%

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Using Several Types of Virtual Characters in Sports - a Literature Survey

Petri

Bandow

Witte

2018

International Journal of Computer Science in Sport

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This article discusses the development and application of virtual environments (VEs) in the domain of exercise as well as research in recreational and high-performance sports. A special focus is put on the use of virtual characters (VCs). For its elaboration, the following criteria parameters were chosen: scene content and the role of the VC, output device, kind of additional feedback, level of expertise of the tested participants, kind of user’s movement (reaction), kind of the visualization of the user’s body, kind of study and kind of evaluation. We explored the role of VCs embodying virtual opponents, teammates, or coaches in sports. We divided these VCs in passive and autonomous characters. Passive VCs are not affected by the user, whereas autonomous VCs adapt autonomously to the user’s movements and positions. We identified 44 sport related VEs, thereof 22 each in the domain of recreational sports and high-performance sports: of the identified 44 VEs, 19 VEs are without VC, 20 VEs with passive VCs, and 5 VEs with autonomous VCs. We categorized studies examining expert athletes in high-performance sports as well as studies analyzing novices, beginners or advanced athletes in recreational sports. Nevertheless, all identified systems are suitable for athletes of recreational and high-performance level

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Which Visualization Devices Are Used In Sport Related Virtuamentioning

confidence: 99%

“…In three studies only some body parts, in all cases the hands, were visualized (e.g. Petri et al, 2017). Further, there are four VEs available, which virtualize sports equipment.…”

Section: Which Visualization Devices Are Used In Sport Related Virtuamentioning

confidence: 99%

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Using Several Types of Virtual Characters in Sports - a Literature Survey

Petri

Bandow

Witte

2018

International Journal of Computer Science in Sport

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A systematic survey of martial art using motion capture technologies: the importance of extrinsic feedback

Idris

Ahmad

Bidin

et al. 2018

Multimed Tools Appl

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The number of research papers on Motion Capture technologies published in conferences and journals has been rapidly increasing due to the emerging of new technologies, software and hardware which create new challenges and opportunities for Martial Arts research. Current trend of the Martial Arts using Motion Capture technologies (MAMoCap) researches consists of phases of MoCap-Processing and Post-MoCap-Processing; contexts of algorithms, performance and system development; and feedbacks of intrinsic and extrinsic. The purpose of this paper is to study and explore the potential future trend of research and publications pertaining to MAMoCap researches. A systematic survey of research publications was conducted through the topic of Martial Art (MA) and Motion Capture (MoCap) in order to retrieve the scientific articles published in FOUR (4) established publishers including SPRINGERLINK, SCIENCEDIRECT, IEEE and ACM. Search refinements were done by the inclusions criteria of document types of academic journals and conference proceedings; and by the exceptions criteria of letters, editorials and book reviews. The findings show that only 27% of the publications have been selected while other 73% have been classified as irrelevant contents due to none significance and relevance to the MAMoCap researches. Analysis on the research phases, contexts and feedbacks has been conducted and discussed in detailed for pertaining knowledge gaps and future research agenda. Based on the preliminary study, a framework of EFs-Based Automated Evaluation System for the martial arts should be proposed.

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The influence of facial expressions on attack recognition and response behaviour in karate kumite

Petri

Bandow

Salb

et al. 2018

European Journal of Sport Science

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Facial expressions play a crucial role in human daily life interactions, so it is possible that they contain relevant anticipatory cues. Therefore, we conducted two studies in karate kumite to analyse the influence of facial expressions on the attack recognition (study A) and on the response behaviour (study B). In study A, 10 karate athletes (age 14-26 years, national and international level) had to recognize temporally occluded karate attacks in 2 conditions (normal and blurred face of the attacker) and identify the upcoming attack (verbal reports). In study B, a natural fight was initiated with 12 karate athletes (age 15-32 years, national and international level) in 3 conditions: an attacker with a normal face, wearing a ski mask, and wearing a ski mask together with sunglasses. The measured parameters response quality and time for response were calculated applying the McNemar test (study A) and Friedman test (study B). Results of study A showed a significant improvement in the attack recognition in the blurred face condition compared to the normal face condition. In study B a significant improvement in time for response was observed in the ski mask and ski mask plus sunglasses conditions (r < 0.1). No significant difference for response quality was found in any of the three conditions. The results of our work indicate that the disguise of the attacker's face leads to a better attack recognition and response behaviour. We conclude that anticipatory cues in karate kumite context mainly lie in the attacker's movements and not in the attacker's face.

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Development of an Autonomous Character in Karate Kumite

Cited by 10 publications

References 37 publications

Using Several Types of Virtual Characters in Sports - a Literature Survey

Using Several Types of Virtual Characters in Sports - a Literature Survey

A systematic survey of martial art using motion capture technologies: the importance of extrinsic feedback

The influence of facial expressions on attack recognition and response behaviour in karate kumite

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