There has been considerable interest in immersive and realistic virtual environment system and how to improve human and computer interaction has been a main challenge. For vision-based human-computer interaction, extraction of user region from camera images is an essential part. In this paper, we propose a background subtraction method that segments dynamic projected background in a rear-projec...

In this paper, a 3D shape acquisition system consisting of a laser projector and a video camera is described. A user projects a stripe of light to the measured 3D scene by hand. The projected light and LED markers attached to the laser projector are captured with the video camera. By estimating the 3D pose of the laser projector from the 2D locations of the markers, the distance to the surface ...

This paper examines a steerable projection system, the everywhere displays projector (ED-projector), which transforms surfaces into interactive displays. In an ED-projector, the display image is directed onto a surface by a rotating mirror. Oblique projection distortion is removed by a computer-graphics reverse-distortion process and user interaction (pointing and clicking) is achieved by detec...

Video projectors and cameras are widely used in augmented environment applications, such as telepresence, smart rooms or immersive spaces. In this paper we discuss the potential of camera-projector systems as sensor-actuator devices that are particularly suitable for robots operating in human-populated environments. A brief review of sensing techniques and possible applications involving the us...

Due to several industrial requirements we were exploring the use of projective displays as an alternative to Augmented Reality user interfaces based on HMDs. This resulted in the development of an Augmented Reality Laser Projector. In this demo we show the laser projector in combination with an easy to use and easy to adapt markerless tracking system. Almost any pseudo planar object can be taug...

This paper discusses a method for obtaining accurate 3D measurements using a temporally encoded structured light system. An objective of the work was to have a balance in the accuracy of all components in the system. This was achieved by including lens distortion in the models for both the camera and projector which comprise the structured light system. In addition, substripe estimation was use...

of thesis entitled Passivity Assessment and Model Order Reduction for Linear Time-Invariant Descriptor Systems in VLSI Circuit Simulation Submitted by Zheng ZHANG for the degree of Master of Philosophy at the University of Hong Kong in June 2010 This thesis presents some theoretical and numerical results for linear time-invariant (LTI) descriptor systems (DSs), with emphasis on their correspond...

This paper introduces the Everywhere Displays projector, a device that uses a rotating mirror to steer the light from an LCD projector onto different surfaces of an environment and a pan/tilt camera to sense interaction with the projected surface. The ED-projector is a generic I/O ubiquitous device that is able to create graphical interfaces on non-wired surfaces, to access computational power ...