Intelligent Database Systems Lab 國立雲林科技大學 National Yunlin University of Science and Technology 1 Martial Arts in Artificial Reality Advisor : Dr. Hsu Presenter : Chia-Hao Yang Author : Perttu Hämäläinen,Tommi Ilmonen, Johanna Höysniemi, Mikko Lindholm, Ari Nykänen SIGCHI 06

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 2  Motivation  Objective  Method  User study  Results and discussion  Conclusions Outline

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 3 Motivation  This paper continues our previous work to motivate training through playful entertainment.

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 4 Objective  Our design goal was to create a physically interactive game that would be both fun and useful as an augmenting form of martial arts training.

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 5 Method  System design ─ You move on a 5x1m playfield, facing either of the two screens and you can perform a combination of kick or punch. ─ The profile view It shows most kicking techniques optimally so that you can see how your leg extend and how far you reach. ─ Special motion Dynamic slow motion  Prince of Persia Sands of time Exaggerated motion  The matrix ─ Technology Computer vision : background subtraction & optical flow  Collision : it is detected between enemies and the outline pixels of the user  A hit is registered if a colliding outline pixel moves fast enough

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 6 Method Horizontal motion  Vertical motion ─ Informal testing This games gas been used in the theater setup it works well as entertainment It works well for people with no martial arts background h0h0

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 7 User study  46 martial arts practitioners and 8 acrobatics participated in this study.  Process ─ Introduction : the participants were asked to fill some information & shown an introductory video ─ Playing : moving, jump, death match with heart rate monitor ─ Interview Good & bad sides of virtual training in this game setting User interface Moving & technique Future improvements

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 8 Results and discussion  Motion exaggeration ─ The distributions indicate that the majority of the subjects liked to gave their motion exaggerated.  Slow motion ─ People feel that they should wait for the avatar ─ The heavy slow motion was considered useful in free training  Heart rates ─ The result shows that the game can be regarded as intensive physical training

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 9 Results and discussion (con.)  Screens and the profile view ─ The subjects often felt confused when switching their gaze from on screen to another ─ This profile view helps in spotting errors in pose and technique  Observations on moving and technique ─ You tend to move carelessly in the game ─ The lack of blocking makes you forget to keep your hands in a guarding position in the game ─ It’s good that the techniques are quick and relaxed  Model based vs. computer vision ─ Computer vision allow the player use any technique with no limitations

Intelligent Database Systems Lab N.Y.U.S.T. I. M. 10 Conclusions  This paper presents Kick Ass Kung-Fu, a martial arts game installation where the player fights virtual enemies.  It works well for entertainment and fitness applications, based on the reactions of the users and the high heart rates measured.