Two main concepts of Head Mounted Displays (HMD) for augmented reality (AR) visualization exist, the optical and video-see through type. Several research groups have pursued both approaches for utilizing HMDs for comp...
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ISBN:
(纸本)0769517811
Two main concepts of Head Mounted Displays (HMD) for augmented reality (AR) visualization exist, the optical and video-see through type. Several research groups have pursued both approaches for utilizing HMDs for computeraided surgery. While the hardware requirements for a video see through HMD to achieve acceptable time delay and frame rate seem to be enormous the clinical acceptance of such a device is doubtful from a practical point of view. Starting from previous work in displaying additional computer-generated graphics in operating microscopes, we have adapted a miniature head mounted operating microscope for AR by integrating two very small computer displays. To calibrate the projection parameters of this so called Varioscope AR we have used Tsai's Algorithm for camera calibration. Connection to a surgical navigation system was performed by defining an open interface to the control unit of the Varioscope AR. The control unit consists of a standard PC with an dual head graphics adapter to render and display the desired augmentation of the scene. We connected this control unit to an computeraided surgery (CAS) system by the TCP/IP interface. In this paper we present the control unit for the HMD and its software design. We tested two different optical tracking systems, the Flashpoint (Image Guided Technologies, Boulder, CO), which provided about 10 frames per second, and the Polaris (Northern Digital, Ontario, Can) which provided at least 30 frames per second, both with a time delay of one frame.
In this paper, we present the development of a nonlinear dynamic model of a 3 degrees-of-freedom (3 DOF) flight control experiment apparatus, the "Quanser UFO", which is a helicopter with three propellers dr...
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Recent advances in the SLICOT Library for CACSD computations are addressed. Functional and performance capabilities of SLICOT software are presented and compared to other standard CACSD packages.
Recent advances in the SLICOT Library for CACSD computations are addressed. Functional and performance capabilities of SLICOT software are presented and compared to other standard CACSD packages.
This paper describes briefly a user-friendly MATLAB package for defining linear matrix inequality (LMI) problems. It acts as an interface for the self-dual-minimisation package (SEDUMI) developed by Sturm (1999).
This paper describes briefly a user-friendly MATLAB package for defining linear matrix inequality (LMI) problems. It acts as an interface for the self-dual-minimisation package (SEDUMI) developed by Sturm (1999).
The paper describes a new algorithm of optimal controlsystemdesign for a linear, time-invariant, single-input single-output plant. The proposed algorithm has low computational complexity, high stability and possesse...
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The paper describes a new algorithm of optimal controlsystemdesign for a linear, time-invariant, single-input single-output plant. The proposed algorithm has low computational complexity, high stability and possesses the clear physical sense of the existence conditions of the design problem solution. The reference (command) signal and disturbances can include random and regular components. The algorithm is based on the matrix method solution of the polynomial equations. Numerical examples are given.
The relation between mutual information rate of system variables and system H/sub /spl infin// entropy is formulated, and an information theoretic interpretation of the minimum entropy H/sub /spl infin// control metho...
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ISBN:
(纸本)078037388X
The relation between mutual information rate of system variables and system H/sub /spl infin// entropy is formulated, and an information theoretic interpretation of the minimum entropy H/sub /spl infin// control method is discussed.
The paper presents an approach of how the important relationships between the actuator, process and design parameters and robustness measures can be determined. In this decomposition method the optimal controldesign ...
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The paper presents an approach of how the important relationships between the actuator, process and design parameters and robustness measures can be determined. In this decomposition method the optimal controldesign for two-degree of freedom time delay controlsystems is discussed. Using a proper CAD algorithm the graphical relationships can be plotted and the ultimate robustness limit of any control can be explicitly calculated.
A new algorithm is presented for the determination of the generalized inverse and the Drazin inverse of a polynomial matrix. The proposed algorithm is based on the discrete Fourier transform and thus is computationall...
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A new algorithm is presented for the determination of the generalized inverse and the Drazin inverse of a polynomial matrix. The proposed algorithm is based on the discrete Fourier transform and thus is computationally fast in contrast to other known algorithms. The above algorithm is implemented in the Mathematica programming language and illustrated via examples.
The aim of this project is to exploit artificial intelligence research outcomes to provide a multifaceted support for users of modeling and simulation techniques, reducing thus the time required to learn the technique...
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The aim of this project is to exploit artificial intelligence research outcomes to provide a multifaceted support for users of modeling and simulation techniques, reducing thus the time required to learn the techniques and enhancing the efficiency of the users' work or study. The developed system is freely available across the Internet.
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