like bodily, physiological, and psychological skills which are commonly assessed in professional sport, assessment of visual skills is also of high importance. in this regard, and in order to organize teams efficiently, the skills of each player, considering his/her post in the pitch, should be developed for superiority over the opponent. the present study attempts to clarify if there is a mean...

We present a tracking system integrating both optical and magnetic tracking which runs on low-cost hardware. This tracking system is part of the “Studierstube”, a new multi-user augmented reality system. On the one hand, two independently running tracking systems are integrated to complement each other, on the other hand by using only parts of two independent tracking systems we can obtain a un...

In order to make virtual modeling as easy as real clay manipulation, we describe a realtime virtual clay model, specially designed for direct hand manipulation. We build on a previous layered model for clay, extending it to handle local properties such as colour or fluidity, to deal with an arbitrary number of tools, and to capture twist effects due to rotating tools. The resulting clay model i...

When recognized by a computer, hands can be very powerful and natural tools to convey information. Hand tracking techniques evolved a lot during the last years from one camera solutions to 3D solutions, offering users an improved experience. This paper first describes (1) the main methods used in hand tracking algorithms based on single camera and their limits, (2) the meaning of touch and the ...

Hand tracking has become an integral feature of recent generations immersive virtual reality head-mounted displays. With the widespread adoption this feature, hardware engineers and software developers are faced with exciting array opportunities a number challenges, mostly in relation to human user. In article, I outline what see as main possibilities for hand add value well some potential chal...

In colocated multi-user Virtual Reality applications, relative user positions in the virtual environment need to match their physical tracking space. A mismatch between and real might lead harmful events such as collisions. This paper examines three calibration methods that enable scenarios for SLAM-tracked head-mounted displays without an external system. Two of these methods—fixed-point marke...

Real-time hand tracking is a challenging task in many computer vision applications such as gesture recognition. This paper proposes a robust method for hand tracking in a complex environment using Mean-shift analysis and Kalman filter in conjunction with 3D depth map. The depth information solve the overlapping problem between hands and face, which is obtained by passive stereo measuring based ...