The Experts below are selected from a list of 4023 Experts worldwide ranked by ideXlab platform
Ondrej Nedved - One of the best experts on this subject based on the ideXlab platform.
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making 3d replicas using a Flatbed Scanner and a 3d printer
International Conference on Computational Science and Its Applications, 2014Co-Authors: Vaclav Skala, Rongjiang Pan, Ondrej NedvedAbstract:This paper describes a novel approach to making 3D replicas of nearly flat objects using a Flatbed Scanner and a 3D printer. The surface reconstruction is based on the fact that the light in a Flatbed Scanner shines under a given constant angle and the CCD sensor records different intensities depending on the angle between a local normal vector of a micro-facet and the vector towards the light source position. The scanned object is rotated by 90ai?? and thus four different images are obtained. It enables normal vector estimation followed by a surface reconstruction based on analogy with solution of partial differential equations. 3D replicas are produced using a 3D printer based on the data from the surface reconstruction. Due to high resolution of the Flatbed Scanner, resulting replicas are of a high precision as well. This method can be used e.g. in making replicas of archaeological parts.
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ICCSA (6) - Making 3D Replicas Using a Flatbed Scanner and a 3D Printer
Computational Science and Its Applications – ICCSA 2014, 2014Co-Authors: Vaclav Skala, Rongjiang Pan, Ondrej NedvedAbstract:This paper describes a novel approach to making 3D replicas of nearly flat objects using a Flatbed Scanner and a 3D printer. The surface reconstruction is based on the fact that the light in a Flatbed Scanner shines under a given constant angle and the CCD sensor records different intensities depending on the angle between a local normal vector of a micro-facet and the vector towards the light source position. The scanned object is rotated by 90ai?? and thus four different images are obtained. It enables normal vector estimation followed by a surface reconstruction based on analogy with solution of partial differential equations. 3D replicas are produced using a 3D printer based on the data from the surface reconstruction. Due to high resolution of the Flatbed Scanner, resulting replicas are of a high precision as well. This method can be used e.g. in making replicas of archaeological parts.
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simple 3d surface reconstruction using Flatbed Scanner and 3d print
International Conference on Computer Graphics and Interactive Techniques, 2013Co-Authors: Vaclav Skala, Rongjiang Pan, Ondrej NedvedAbstract:Reconstruction of nearly flat 3D objects can be used in many applications, e.g. getting 3D surface for games, reconstruction of historical fragments etc. The presented approach uses a Flatbed Scanner to reconstruct a surface of nearly flat objects without calibration and produce a 3D copy of the scanned object using a 3D printer.
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SIGGRAPH ASIA Posters - Simple 3D surface reconstruction using Flatbed Scanner and 3D print
SIGGRAPH Asia 2013 Posters on - SA '13, 2013Co-Authors: Vaclav Skala, Rongjiang Pan, Ondrej NedvedAbstract:Reconstruction of nearly flat 3D objects can be used in many applications, e.g. getting 3D surface for games, reconstruction of historical fragments etc. The presented approach uses a Flatbed Scanner to reconstruct a surface of nearly flat objects without calibration and produce a 3D copy of the scanned object using a 3D printer.
Suk-kyu Chang - One of the best experts on this subject based on the ideXlab platform.
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Flatbed Scanner based colorimetric cu2 signaling system derived from a coumarin benzopyrylium conjugated dye
Sensors and Actuators B-chemical, 2018Co-Authors: Myung Gil Choi, Yu Jeong Lee, In Jung Chang, Hyein Ryu, Sangwoon Yoon, Suk-kyu ChangAbstract:Abstract In this study, we developed a Flatbed-Scanner-based Cu2+-selective signaling method using a coumarin–benzopyrylium conjugated dye platform. The designed sensors (CB-1 and CB-2) were readily synthesized by the reaction of coumarin–benzopyrylium hydrazide with salicylaldehyde or 2-hydroxynaphthaldehyde, respectively. Sensor CB-1 exhibited pronounced colorimetric and fluorescence signaling behaviors toward Cu2+ ions in 50% aqueous acetate buffered (pH 4.7) acetonitrile solution. The Cu2+ signaling of the developed sensor was not affected by the presence of environmentally relevant metal ions. The detection limit of sensor CB-1 for Cu2+ ions was estimated to be 4.0 × 10−8 M (2.5 ppb). In addition, to develop a convenient and straightforward Cu2+ detection method for nonprofessional personnel and practical field applications, the colorimetric determination of Cu2+ ions using a Flatbed Scanner, a readily available IT device, was investigated. Using simulated semiconductor wastewater as a practical sample, the Cu2+ levels were readily determined by a Flatbed Scanner in transmittance mode with a sensitive detection limit of 2.9 × 10−7 M (18 ppb).
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Flatbed-Scanner-based colorimetric Cu2+ signaling system derived from a coumarin–benzopyrylium conjugated dye
Sensors and Actuators B: Chemical, 2018Co-Authors: Myung Gil Choi, Yu Jeong Lee, In Jung Chang, Hyein Ryu, Sangwoon Yoon, Suk-kyu ChangAbstract:Abstract In this study, we developed a Flatbed-Scanner-based Cu2+-selective signaling method using a coumarin–benzopyrylium conjugated dye platform. The designed sensors (CB-1 and CB-2) were readily synthesized by the reaction of coumarin–benzopyrylium hydrazide with salicylaldehyde or 2-hydroxynaphthaldehyde, respectively. Sensor CB-1 exhibited pronounced colorimetric and fluorescence signaling behaviors toward Cu2+ ions in 50% aqueous acetate buffered (pH 4.7) acetonitrile solution. The Cu2+ signaling of the developed sensor was not affected by the presence of environmentally relevant metal ions. The detection limit of sensor CB-1 for Cu2+ ions was estimated to be 4.0 × 10−8 M (2.5 ppb). In addition, to develop a convenient and straightforward Cu2+ detection method for nonprofessional personnel and practical field applications, the colorimetric determination of Cu2+ ions using a Flatbed Scanner, a readily available IT device, was investigated. Using simulated semiconductor wastewater as a practical sample, the Cu2+ levels were readily determined by a Flatbed Scanner in transmittance mode with a sensitive detection limit of 2.9 × 10−7 M (18 ppb).
F. Garzón - One of the best experts on this subject based on the ideXlab platform.
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astrometry with carte du ciel plates san fernando zone i digitization and measurement using a Flatbed Scanner
Astronomy and Astrophysics, 2007Co-Authors: B. Vicente, C. Abad, F. GarzónAbstract:Context. The historic plates of the Carte du Ciel , an international cooperative project launched in 1887, offers valuable first-epoch material for determining of absolute proper motions. Aims. We present an original method of digitizing and astrometrically reducing Carte du Ciel plate material using an inexpensive Flatbed Scanner, to demonstrate that for this material there is an alternative to more specialized measuring machines that are very few in number and thus not readily available. The sample of plates chosen to develop this method are original Carte du Ciel plates of the San Fernando zone, photographic material with a mean epoch 1903.6, and a limiting photographic magnitude ~14.5, covering the declination range of $-10^{\circ} \leq \delta \leq -2^{\circ}$. Methods. Digitization has been made using a commercial Flatbed Scanner, demonstrating the internal precision that can be attained with such a device. A variety of post-scan corrections are shown to be necessary. In particular, the large distortion introduced by the non-uniform action of the Scanner is modelled using multiple scans of each plate. We also tackle the specific problems associated with the triple-exposure images on some plates and the reseau grid lines present on all. The final measures are reduced to celestial coordinates using the Tycho-2 Catalogue. Results. The internal precision obtained over a single plate, $3~\rm \mu m \sim 0\farcs18$ in each axis, is comparable to what is realized with similar plate material using slower, less affordable, and less widely available conventional measuring machines, such as a PDS microdensitometer. The accuracy attained over large multi-plate areas, employing an overlapping plate technique, is estimated at 0$\farcs$2. Conclusions. The techniques presented here for digitizing photographic material provide a fast and readily available option for the exploitation of old plate collections. Our demonstration area, consisting of ~560 000 stars at an average epoch of 1901.4, is presented as a practical example of the developed scanning and reduction methods. These results are currently being combined with modern astrometry to produce an absolute proper-motion catalogue whose construction is underway.
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Astrometry with "Carte du Ciel" plates, San Fernando zone. I. Digitization and measurement using a Flatbed Scanner
Astronomy & Astrophysics, 2007Co-Authors: B. Vicente, C. Abad, F. GarzónAbstract:We present an original method of digitizing and astrometrically reducing "Carte du Ciel" plate material using an inexpensive Flatbed Scanner, to demonstrate that for this material there is an alternative to more specialized measuring machines that are very few in number and thus not readily available. The sample of plates chosen to develop this method are original "Carte du Ciel" plates of the San Fernando zone, photographic material with a mean epoch 1903.6, and a limiting photographic magnitude ~14.5, covering the declination range of -10 < dec < -2. Digitization has been made using a commercial Flatbed Scanner, demonstrating the internal precision that can be attained with such a device. A variety of post-scan corrections are shown to be necessary. In particular, the large distortion introduced by the non-uniform action of the Scanner is modelled using multiple scans of each plate. We also tackle the specific problems associated with the triple-exposure images on some plates and the grid lines present on all. The final measures are reduced to celestial coordinates using the Tycho-2 Catalogue. The internal precision obtained over a single plate, 3microns ~ 0.18" in each axis, is comparable to what is realized with similar plate material using slower, less affordable, and less widely available conventional measuring machines, such as a PDS microdensitometer. The accuracy attained over large multi-plate areas, employing an overlapping plate technique, is estimated at 0.2".
Vaclav Skala - One of the best experts on this subject based on the ideXlab platform.
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making 3d replicas using a Flatbed Scanner and a 3d printer
International Conference on Computational Science and Its Applications, 2014Co-Authors: Vaclav Skala, Rongjiang Pan, Ondrej NedvedAbstract:This paper describes a novel approach to making 3D replicas of nearly flat objects using a Flatbed Scanner and a 3D printer. The surface reconstruction is based on the fact that the light in a Flatbed Scanner shines under a given constant angle and the CCD sensor records different intensities depending on the angle between a local normal vector of a micro-facet and the vector towards the light source position. The scanned object is rotated by 90ai?? and thus four different images are obtained. It enables normal vector estimation followed by a surface reconstruction based on analogy with solution of partial differential equations. 3D replicas are produced using a 3D printer based on the data from the surface reconstruction. Due to high resolution of the Flatbed Scanner, resulting replicas are of a high precision as well. This method can be used e.g. in making replicas of archaeological parts.
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ICCSA (6) - Making 3D Replicas Using a Flatbed Scanner and a 3D Printer
Computational Science and Its Applications – ICCSA 2014, 2014Co-Authors: Vaclav Skala, Rongjiang Pan, Ondrej NedvedAbstract:This paper describes a novel approach to making 3D replicas of nearly flat objects using a Flatbed Scanner and a 3D printer. The surface reconstruction is based on the fact that the light in a Flatbed Scanner shines under a given constant angle and the CCD sensor records different intensities depending on the angle between a local normal vector of a micro-facet and the vector towards the light source position. The scanned object is rotated by 90ai?? and thus four different images are obtained. It enables normal vector estimation followed by a surface reconstruction based on analogy with solution of partial differential equations. 3D replicas are produced using a 3D printer based on the data from the surface reconstruction. Due to high resolution of the Flatbed Scanner, resulting replicas are of a high precision as well. This method can be used e.g. in making replicas of archaeological parts.
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simple 3d surface reconstruction using Flatbed Scanner and 3d print
International Conference on Computer Graphics and Interactive Techniques, 2013Co-Authors: Vaclav Skala, Rongjiang Pan, Ondrej NedvedAbstract:Reconstruction of nearly flat 3D objects can be used in many applications, e.g. getting 3D surface for games, reconstruction of historical fragments etc. The presented approach uses a Flatbed Scanner to reconstruct a surface of nearly flat objects without calibration and produce a 3D copy of the scanned object using a 3D printer.
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Normal Map Acquisition of Nearly Flat Objects Using a Flatbed Scanner
2013 International Conference on Virtual Reality and Visualization, 2013Co-Authors: Rongjiang Pan, Vaclav SkalaAbstract:We propose a new efficient technique for acquiring normal maps of nearly flat objects using a Flatbed Scanner. The technique requires no hardware modification or dedicated calibration. Our setup consists of a conventional Flatbed Scanner and a clamp on which a planar checkerboard is glued. We take four scans of the object manually rotated by roughly 90 degrees. The scans are then registered by sub pixel checkerboard corners. Detailed normal map of the scanned surface is obtained by solving a linear least squares problem.
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SIGGRAPH ASIA Posters - Simple 3D surface reconstruction using Flatbed Scanner and 3D print
SIGGRAPH Asia 2013 Posters on - SA '13, 2013Co-Authors: Vaclav Skala, Rongjiang Pan, Ondrej NedvedAbstract:Reconstruction of nearly flat 3D objects can be used in many applications, e.g. getting 3D surface for games, reconstruction of historical fragments etc. The presented approach uses a Flatbed Scanner to reconstruct a surface of nearly flat objects without calibration and produce a 3D copy of the scanned object using a 3D printer.
B. Vicente - One of the best experts on this subject based on the ideXlab platform.
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astrometry with carte du ciel plates san fernando zone i digitization and measurement using a Flatbed Scanner
Astronomy and Astrophysics, 2007Co-Authors: B. Vicente, C. Abad, F. GarzónAbstract:Context. The historic plates of the Carte du Ciel , an international cooperative project launched in 1887, offers valuable first-epoch material for determining of absolute proper motions. Aims. We present an original method of digitizing and astrometrically reducing Carte du Ciel plate material using an inexpensive Flatbed Scanner, to demonstrate that for this material there is an alternative to more specialized measuring machines that are very few in number and thus not readily available. The sample of plates chosen to develop this method are original Carte du Ciel plates of the San Fernando zone, photographic material with a mean epoch 1903.6, and a limiting photographic magnitude ~14.5, covering the declination range of $-10^{\circ} \leq \delta \leq -2^{\circ}$. Methods. Digitization has been made using a commercial Flatbed Scanner, demonstrating the internal precision that can be attained with such a device. A variety of post-scan corrections are shown to be necessary. In particular, the large distortion introduced by the non-uniform action of the Scanner is modelled using multiple scans of each plate. We also tackle the specific problems associated with the triple-exposure images on some plates and the reseau grid lines present on all. The final measures are reduced to celestial coordinates using the Tycho-2 Catalogue. Results. The internal precision obtained over a single plate, $3~\rm \mu m \sim 0\farcs18$ in each axis, is comparable to what is realized with similar plate material using slower, less affordable, and less widely available conventional measuring machines, such as a PDS microdensitometer. The accuracy attained over large multi-plate areas, employing an overlapping plate technique, is estimated at 0$\farcs$2. Conclusions. The techniques presented here for digitizing photographic material provide a fast and readily available option for the exploitation of old plate collections. Our demonstration area, consisting of ~560 000 stars at an average epoch of 1901.4, is presented as a practical example of the developed scanning and reduction methods. These results are currently being combined with modern astrometry to produce an absolute proper-motion catalogue whose construction is underway.
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Astrometry with "Carte du Ciel" plates, San Fernando zone. I. Digitization and measurement using a Flatbed Scanner
Astronomy & Astrophysics, 2007Co-Authors: B. Vicente, C. Abad, F. GarzónAbstract:We present an original method of digitizing and astrometrically reducing "Carte du Ciel" plate material using an inexpensive Flatbed Scanner, to demonstrate that for this material there is an alternative to more specialized measuring machines that are very few in number and thus not readily available. The sample of plates chosen to develop this method are original "Carte du Ciel" plates of the San Fernando zone, photographic material with a mean epoch 1903.6, and a limiting photographic magnitude ~14.5, covering the declination range of -10 < dec < -2. Digitization has been made using a commercial Flatbed Scanner, demonstrating the internal precision that can be attained with such a device. A variety of post-scan corrections are shown to be necessary. In particular, the large distortion introduced by the non-uniform action of the Scanner is modelled using multiple scans of each plate. We also tackle the specific problems associated with the triple-exposure images on some plates and the grid lines present on all. The final measures are reduced to celestial coordinates using the Tycho-2 Catalogue. The internal precision obtained over a single plate, 3microns ~ 0.18" in each axis, is comparable to what is realized with similar plate material using slower, less affordable, and less widely available conventional measuring machines, such as a PDS microdensitometer. The accuracy attained over large multi-plate areas, employing an overlapping plate technique, is estimated at 0.2".
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Digitization of Carte Du Ciel Plates, San Fernando Zone, Using a Flatbed Scanner
Highlights of Spanish Astrophysics III, 2003Co-Authors: B. Vicente, C. AbadAbstract:We present results as to the astrometric precision obtained upon digitization by a Flatbed Scanner relative to that of a PDS. Preliminary results indicate a final, internal accuracy of ~ 1.5µm in x and ~ 1.0 µm in y for the mean of two scans. The results given are for actual Carte du Ciel plate material, San Fernando zone, of the collections at Real Observatorio de la Armada (ROA), Cadiz (Espana).