摘要 :
A volumetric display system based on three-dimensional (3-D) scanning that uses an inclined two-dimensional (2-D) image is described. In the volumetric display system a 2-D display unit is placed obliquely in an imaging system int...
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A volumetric display system based on three-dimensional (3-D) scanning that uses an inclined two-dimensional (2-D) image is described. In the volumetric display system a 2-D display unit is placed obliquely in an imaging system into which a rotating mirror is inserted. When the mirror is rotated, the inclined 2-D image is moved laterally. A locus of the moving image can be observed by persistence of vision as a result of the high-speed rotation of the mirror. Inclined cross-sectional images of an object are displayed on the display unit in accordance with the position of the image plane to observe a 3-D image of the object by persistence of vision. Three-dimensional images formed by this display system satisfy all the criteria for stereoscopic vision. We constructed the volumetric display systems using a galvanometer mirror and a vector-scan display unit. In addition, we constructed a real-time 3-D measurement system based on a light section method. Measured 3-D images can be reconstructed in the 3-D display system in real time.
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摘要 :
A volumetric display system based on three-dimensional (3-D) scanning that uses an inclined two-dimensional (2-D) image is described. In the volumetric display system a 2-D display unit is placed obliquely in an imaging system int...
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A volumetric display system based on three-dimensional (3-D) scanning that uses an inclined two-dimensional (2-D) image is described. In the volumetric display system a 2-D display unit is placed obliquely in an imaging system into which a rotating mirror is inserted. When the mirror is rotated, the inclined 2-D image is moved laterally. A locus of the moving image can be observed by persistence of vision as a result of the high-speed rotation of the mirror. Inclined cross-sectional images of an object are displayed on the display unit in accordance with the position of the image plane to observe a 3-D image of the object by persistence of vision. Three-dimensional images formed by this display system satisfy all the criteria for stereoscopic vision. We constructed the volumetric display systems using a galvanometer mirror and a vector-scan display unit. In addition, we constructed a real-time 3-D measurement system based on a light section method. Measured 3-D images can be reconstructed in the 3-D display system in real time.
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摘要 :
A volumetric display system based on three-dimensional (3-D) scanning that uses an inclined two-dimensional (2-D) image is described. In the volumetric display system a 2-D display unit is placed obliquely in an imaging system int...
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A volumetric display system based on three-dimensional (3-D) scanning that uses an inclined two-dimensional (2-D) image is described. In the volumetric display system a 2-D display unit is placed obliquely in an imaging system into which a rotating mirror is inserted. When the mirror is rotated, the inclined 2-D image is moved laterally. A locus of the moving image can be observed by persistence of vision as a result of the high-speed rotation of the mirror. Inclined cross-sectional images of an object are displayed on the display unit in accordance with the position of the image plane to observe a 3-D image of the object by persistence of vision. Three-dimensional images formed by this display system satisfy all the criteria for stereoscopic vision. We constructed the volumetric display systems using a galvanometer mirror and a vector-scan display unit. In addition, we constructed a real-time 3-D measurement system based on a light section method. Measured 3-D images can be reconstructed in the 3-D display system in real time.
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We have developed a 60 GHz chip antenna designed for use as a gain and pattern verification tool in the calibration process of a millimeter wave antenna test chamber. The antenna is designed to interface with ground-signal-ground ...
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We have developed a 60 GHz chip antenna designed for use as a gain and pattern verification tool in the calibration process of a millimeter wave antenna test chamber. The antenna is designed to interface with ground-signal-ground (GSG) micro-probes that have a probe pitch of 150 um to 250 um. This low temperature cofired ceramic (LTCC) chip antenna is fabricated using DuPont's 9K7 GreenTape™ material system with gold conductors. Features include a wafer-probe transition, a shielded stripline corporate feed network, aperture coupled patch elements, and an integrated Sievenpiper electromagnetic bandgap (EBG) structure for surface wave mode suppression. The use of the EBG structure enables main beam gain enhancement and side lobe level suppression. This 2×2 antenna array is directive such that it offers a nominal gain of 12 dBi at broadside over 58–62 GHz with an antenna efficiency of at least 60%. The entire antenna package has a nominal size of only 10.9 mm × 12.2 mm × 0.71 mm. Since this antenna package material is hermetic, it has stable performance under varying humidity and temperature which is highly desirable as a reference antenna.
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摘要 :
We have developed a 60 GHz chip antenna designed for use as a gain and pattern verification tool in the calibration process of a millimeter wave antenna test chamber. The antenna is designed to interface with ground-signal-ground ...
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We have developed a 60 GHz chip antenna designed for use as a gain and pattern verification tool in the calibration process of a millimeter wave antenna test chamber. The antenna is designed to interface with ground-signal-ground (GSG) micro-probes that have a probe pitch of 150 um to 250 um. This low temperature cofired ceramic (LTCC) chip antenna is fabricated using DuPont's 9K7 GreenTape? material system with gold conductors. Features include a wafer-probe transition, a shielded stripline corporate feed network, aperture coupled patch elements, and an integrated Sievenpiper electromagnetic bandgap (EBG) structure for surface wave mode suppression. The use of the EBG structure enables main beam gain enhancement and side lobe level suppression. This 2×2 antenna array is directive such that it offers a nominal gain of 12 dBi at broadside over 58–62 GHz with an antenna efficiency of at least 60%. The entire antenna package has a nominal size of only 10.9 mm × 12.2 mm × 0.71 mm. Since this antenna package material is hermetic, it has stable performance under varying humidity and temperature which is highly desirable as a reference antenna.
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This paper presents an approach to store binary voxel maps of arbitrary, non-power-of-2 dimensions, using 2D and 3D spatial subdivision. The two data structures used are quadtrees and octrees. The approach presented is applied on ...
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This paper presents an approach to store binary voxel maps of arbitrary, non-power-of-2 dimensions, using 2D and 3D spatial subdivision. The two data structures used are quadtrees and octrees. The approach presented is applied on voxel maps of bone tissue that has been microCT scanned at a resolution of a few microns. Due to space requirements all source data may not be expanded to cover sizes that are a power of 2, which would greatly simplify the subdivision approach. The 2D subdivision data structure is applied on a per z-level, while the 3D subdivision is applied on the entire voxel map. Either of the two approaches compresses the initial data, although not at the same level. The 2D approach allows selective decompression of each z-layer, without processing the remaining voxel map.
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摘要 :
This paper presents an approach to store binary voxel maps of arbitrary, non-power-of-2 dimensions, using 2D and 3D spatial subdivision. The two data structures used are quadtrees and octrees. The approach presented is applied on ...
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This paper presents an approach to store binary voxel maps of arbitrary, non-power-of-2 dimensions, using 2D and 3D spatial subdivision. The two data structures used are quadtrees and octrees. The approach presented is applied on voxel maps of bone tissue that has been microCT scanned at a resolution of a few microns. Due to space requirements all source data may not be expanded to cover sizes that are a power of 2, which would greatly simplify the subdivision approach. The 2D subdivision data structure is applied on a per z-level, while the 3D subdivision is applied on the entire voxel map. Either of the two approaches compresses the initial data, although not at the same level. The 2D approach allows selective decompression of each z-layer, without processing the remaining voxel map.
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A new three-dimensional display system based on a volume-scanning method is demonstrated. To form a three-dimensional real image, an inclined two-dimensional image is rapidly moved with a mirror scanner while the cross-section pat...
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A new three-dimensional display system based on a volume-scanning method is demonstrated. To form a three-dimensional real image, an inclined two-dimensional image is rapidly moved with a mirror scanner while the cross-section patterns of a three-dimensional object are displayed sequentially. A vector-scan CRT display unit is used to obtain a high-resolution image. An optical scanning system is constructed with concave mirrors and a galvanometer mirror. It is confirmed that three-dimensional images, formed by the experimental system, satisfy all the criteria for human stereoscopic vision.
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Smart Grids are intelligent by definition. Their capacity of “reporting”, facilitate the flow of information which is essential to guaranteeing the proper functioning of Critical Infrastructure(CI). Smart grids are meant to enha...
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Smart Grids are intelligent by definition. Their capacity of “reporting”, facilitate the flow of information which is essential to guaranteeing the proper functioning of Critical Infrastructure(CI). Smart grids are meant to enhance both the level of security of CI such as seaports and build a more effective resilient process in case of disruptions.
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摘要 :
Smart Grids are intelligent by definition. Their capacity of “reporting”, facilitate the flow of information which is essential to guaranteeing the proper functioning of Critical Infrastructure(CI). Smart grids are meant to enha...
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Smart Grids are intelligent by definition. Their capacity of “reporting”, facilitate the flow of information which is essential to guaranteeing the proper functioning of Critical Infrastructure(CI). Smart grids are meant to enhance both the level of security of CI such as seaports and build a more effective resilient process in case of disruptions.
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