A head-mounted display (HMD) system suffers largely from the time lag between human motion and the display output. The concept of a reflex HMD to compensate for the time lag is proposed and discussed. Based on this no...
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ISBN:
(纸本)0769514928
A head-mounted display (HMD) system suffers largely from the time lag between human motion and the display output. The concept of a reflex HMD to compensate for the time lag is proposed and discussed. Based on this notion, a prototype reflex HMD is constructed. The rotational movement of the user's head is measured by a gyroscope, modulating the driving signal for the LCD panel, and this shifts the viewport within the image supplied from the computer. The derivative distortion was investigated, and the dynamic deformation of the watched world was picked up as the essential demerit. Cylinderical rendering is introduced to solve this problem and is proved to cancel this dynamic deformation, and also to decrease the static distortion.
The aim of this study is to explore the feasibility of multiple display environment technology in the real world. In this paper, the wearable projector, with an infrared camera and light source, is used in combination...
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ISBN:
(纸本)0769514928
The aim of this study is to explore the feasibility of multiple display environment technology in the real world. In this paper, the wearable projector, with an infrared camera and light source, is used in combination with retro-reflective screens. The visible image and infrared light are projected to the screen and reflected back to the user's eye and the infrared camera. The screen location and the user's fingertip position are calculated using image processing to enable the interaction. Several examples or demonstrations have been constructed to show the usage of this configuration. The screen functions as both the visible screen and the high-gain infrared marker at the same time. Owing to high-reflection gain of retro-reflective screens, a small, lightweight projector can be used. Also, the high contrast between the screen and the other environmental object in the captured infrared image decreases the difficulty of image processing.
A VLSI architecture dedicated to W-CDMA (Wideband Code Division Multiple Access) baseband modem is described, with the main theme focused on the cell searcher and PIL (Prime InterLeaver). A search algorithm is refined...
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A VLSI architecture dedicated to W-CDMA (Wideband Code Division Multiple Access) baseband modem is described, with the main theme focused on the cell searcher and PIL (Prime InterLeaver). A search algorithm is refined for the cell searcher to minimize the circuit size, maintaining the operating throughput. In addition, a time-shared scheme is adopted for the turbo encoding/decoding, aiming at the maximization of the hardware sharing in the encoding/decoding process. Finally, implementation results are shown to demonstrate that the proposed architecture can contribute much toward the practical low-power implementation of W-CDMA baseband modem LSI.
Gaze detection is to locate the position on a monitor screen where a user is looking. In our work, we implement it with a computer vision system setting a IR-LED based single camera. To detect the gaze position, we lo...
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This paper proposes an intelligent diagnosis method for plant machinery using wavelet transform (WT) genetic programming (GP) and possibility theory. The WT is used to extract feature spectra of each machine state fro...
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This paper proposes an intelligent diagnosis method for plant machinery using wavelet transform (WT) genetic programming (GP) and possibility theory. The WT is used to extract feature spectra of each machine state from measured vibration signal for distinguishing faults. Excellent symptom parameters (SP) for detecting fault states are automatically generated by GP. The membership functions of symptom parameters are established using possibility theory for resolving the ambiguous diagnosis problems. The methods proposed in this paper are verified by applying them to the fault diagnosis of gear equipment.
Blood pressure measurement in the finger artery offers some advantages compared with that in the brachial artery. However, volume oscillometric signals obtained from finger artery measurement are often influenced by m...
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Blood pressure measurement in the finger artery offers some advantages compared with that in the brachial artery. However, volume oscillometric signals obtained from finger artery measurement are often influenced by motion artefact due to respiration, speaking, involuntary or voluntary movement, etc. In this paper, we developed a digital envelope detector to detect the maximum oscillation criterion in blood pressure measurement for the first time. The digital envelope detector is robust to noise signals generated by motion artefact and filters out the carrier frequency efficiently. To verify the feasibility of our method, we measured blood pressure for eight subjects using our developed system. The results were compared with the auscultation method. In the case of using a digital envelope detector, we could reduce the mean difference error and standard deviation by 30-40%. Our proposed digital envelope detector is a useful tool to improve the accuracy of blood pressure measurement in finger artery.
In CELP coding, signal modification is often employed to improve the pitch prediction at lowest bit rates. In this paper, a signal modification method for coding purely voiced wideband speech frames is introduced. The...
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In CELP coding, signal modification is often employed to improve the pitch prediction at lowest bit rates. In this paper, a signal modification method for coding purely voiced wideband speech frames is introduced. The modification is performed frame and pitch synchronously preserving the original time scale at the end of each frame, which makes the method particularly convenient for variable bit rate coding. Special attention is paid to modify only the frames which are most suitable for the signal modification and low bit rate coding. The signal modification method is applied to a variable bit rate ACELP coder that satisfies IS-95/CDMA2000 rate-set II system requirements.
Investigates development of an in-situ bioremediation process control system that can optimize the complex physical, chemical, and biological processes involved in in-situ bioremediation. A hybrid fuzzy predictive con...
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Investigates development of an in-situ bioremediation process control system that can optimize the complex physical, chemical, and biological processes involved in in-situ bioremediation. A hybrid fuzzy predictive control system is constructed for real time control of in-situ bioremediation process. This control system consists of three parts: an input/output interface system, a database system and a fuzzy expert system. This control system can handle the inherent uncertainty of the bioremediation simulation model in real time.
This paper attempts to look at the fundamental problem of fault detection and isolation (FDI) in nonlinear systems. Using the idea of input reconstruction by means of dynamic inversion the authors first discuss the pr...
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This paper attempts to look at the fundamental problem of fault detection and isolation (FDI) in nonlinear systems. Using the idea of input reconstruction by means of dynamic inversion the authors first discuss the properties of input (or fault) observability in linear systems. The extension of the results to nonlinear systems as well as the mathematical conditions of the calculation of the inverse system, which provides the inverse in finite algorithmic steps, are given. The applicability of the inversion process to fault reconstruction in nonlinear systems is demonstrated.
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