scholarly journals Simulation of Multi-Camera Indoor and Outdoor 3D Scanner

2018 ◽  
Vol 2 (3) ◽  
pp. 33-41
Author(s):  
Keyword(s):  
Three Dimensional ◽  
System Structure ◽  
3D Scanner ◽  
Background Removal ◽  
Dimensional Reconstruction ◽  
Characteristic Points ◽  
Graphic Engine ◽  
The Impact ◽  
Indoor And Outdoor

Photogrammetry allows a three-dimensional reconstruction of the object based on its multiple photography’s. The quality of the reconstruction result depends mostly on the gloss, the diversity of the texture, the lighting conditions, the quality of the camera calibration and the shape of the object. The article presents the results of a simulation of a multi-camera reconstruction system, for the needs of designing indoor and outdoor 3D scanner. The 3D reconstruction system works by simultaneously taking photographs of cameras located around the object. The simulation was created to investigate the optimal distribution of cameras and projectors casting a pattern that increases the number of characteristic points on the surface of the object. The impact of background removal in images on the reconstruction result as well as the texture quality of the object depending on the resolution and distance of the cameras from the object were also investigated. The graphic engine used to create the simulation also allows testing of impact of various conditions. The presented results prove that the parameters of the system structure, such as the placement of cameras, projectors, the selection of patterns projected by the projectors are important and their values can be determined at the stage of system simulation. The acquired results are promising and will be further investigated.

Semi-automated methods for 3-D reconstruction of macromolecular complexes

1995 ◽  
Vol 53 ◽  
pp. 42-43
Author(s):  
B. Carragher ◽  
M. Whittaker
Keyword(s):  
Three Dimensional ◽  
Time Saving ◽  
Macromolecular Complexes ◽  
Symmetry Properties ◽  
Dimensional Reconstruction ◽  
Experienced Operator ◽  
Projection Images ◽  
The Individual ◽  
Natural Symmetry

Techniques for three-dimensional reconstruction of macromolecular complexes from electron micrographs have been successfully used for many years. These include methods which take advantage of the natural symmetry properties of the structure (for example helical or icosahedral) as well as those that use single axis or other tilting geometries to reconstruct from a set of projection images. These techniques have traditionally relied on a very experienced operator to manually perform the often numerous and time consuming steps required to obtain the final reconstruction. While the guidance and oversight of an experienced and critical operator will always be an essential component of these techniques, recent advances in computer technology, microprocessor controlled microscopes and the availability of high quality CCD cameras have provided the means to automate many of the individual steps.During the acquisition of data automation provides benefits not only in terms of convenience and time saving but also in circumstances where manual procedures limit the quality of the final reconstruction.

scholarly journals The impact of technical parameters on the perception quality of three-dimensional content

2020 ◽  
Vol 29 (4) ◽  
pp. 13-18
Author(s):  
Fabijan Nushi ◽  
◽  
Vladimir Cviljušac ◽  
Lidija Mandić ◽  
◽  
...  
Keyword(s):  
Three Dimensional ◽  
Technical Parameters ◽  
The Impact

A modified discrete tomography for improving the reconstruction of unknown multi-gray-level material in the `missing wedge' situation

2018 ◽  
Vol 25 (6) ◽  
pp. 1847-1859 ◽  
Author(s):  
Jianhong Liu ◽  
Zhiting Liang ◽  
Yong Guan ◽  
Wenbin Wei ◽  
Haobo Bai ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Iteration Process ◽  
Reconstruction Technique ◽  
Morphological Operations ◽  
Algebraic Reconstruction Technique ◽  
Discrete Tomography ◽  
Boundary Extraction ◽  
X Ray ◽  
Dimensional Reconstruction

Full angular rotational projections cannot always be acquired in tomographic reconstructions because of the limited space in the experimental setup, leading to the `missing wedge' situation. In this paper, a recovering `missing wedge' discrete algebraic reconstruction technique algorithm (rmwDART) has been proposed to solve the `missing wedge' problem and improve the quality of the three-dimensional reconstruction without prior knowledge of the material component's number or the material's values. By using oversegmentation, boundary extraction and mathematical morphological operations, `missing wedge' artifact areas can be located. Then, in the iteration process, by updating the located areas and regions, high-quality reconstructions can be obtained from the simulations, and the reconstructed images based on the rmwDART algorithm can be obtained from soft X-ray nano-computed tomography experiments. The results showed that there is the potential for discrete tomography.

The impact of body-mass index on the frontal knee alignment estimation using three-dimensional reconstruction based on movement analysis

The Knee ◽  
2020 ◽  
Vol 27 (1) ◽  
pp. 89-94 ◽  
Author(s):  
Thomas Legrand ◽  
Vincent Richard ◽  
Alice Bonnefoy-Mazure ◽  
Stéphane Armand ◽  
Hermes H. Miozzari ◽  
...  
Keyword(s):  
Body Mass Index ◽  
Body Mass ◽  
Three Dimensional ◽  
Movement Analysis ◽  
Three Dimensional Reconstruction ◽  
Knee Alignment ◽  
Dimensional Reconstruction ◽  
The Impact

scholarly journals An evaluation of adhesive sample holders for advanced crystallographic experiments

2014 ◽  
Vol 70 (9) ◽  
pp. 2390-2400 ◽  
Author(s):  
Marco Mazzorana ◽  
Juan Sanchez-Weatherby ◽  
James Sandy ◽  
Carina M. C. Lobley ◽  
Thomas Sorensen
Keyword(s):  
Three Dimensional ◽  
X Ray Diffraction ◽  
Porous Support ◽  
Step Procedure ◽  
Alternative Approach ◽  
Hydration State ◽  
Different Types ◽  
One Step ◽  
The Impact

The hydration state of macromolecular crystals often affects their overall order and, ultimately, the quality of the X-ray diffraction pattern that they produce. Post-crystallization techniques that alter the solvent content of a crystal may induce rearrangement within the three-dimensional array making up the crystal, possibly resulting in more ordered packing. The hydration state of a crystal can be manipulated by exposing it to a stream of air at controlled relative humidity in which the crystal can equilibrate. This approach provides a way of exploring crystal hydration space to assess the diffraction capabilities of existing crystals. A key requirement of these experiments is to expose the crystal directly to the dehydrating environment by having the minimum amount of residual mother liquor around it. This is usually achieved by placing the crystal on a flat porous support (Kapton mesh) and removing excess liquid by wicking. Here, an alternative approach is considered whereby crystals are harvested using adhesives that capture naked crystals directly from their crystallization drop, reducing the process to a one-step procedure. The impact of using adhesives to ease the harvesting of different types of crystals is presented together with their contribution to background scattering and their usefulness in dehydration experiments. It is concluded that adhesive supports represent a valuable tool for mounting macromolecular crystals to be used in humidity-controlled experiments and to improve signal-to-noise ratios in diffraction experiments, and how they can protect crystals from modifications in the sample environment is discussed.

scholarly journals AN IMAGE-BASED INEXPENSIVE 3D SCANNER

2003 ◽  
Vol 03 (02) ◽  
pp. 235-263
Author(s):  
ULAŞ YILMAZ ◽  
ADEM YAŞAR MÜLAYİM ◽  
VOLKAN ATALAY
Keyword(s):  
Rotation Axis ◽  
Three Dimensional ◽  
Calibration Method ◽  
Correction Method ◽  
Controlled Environment ◽  
Model Reconstruction ◽  
3D Scanner ◽  
Rigid Object ◽  
Bounding Volume

An image-based model reconstruction system is described in this paper where real images of a rigid object acquired under a simple but controlled environment are used to recover its three dimensional geometry and its surface texture. Based on a multi-image calibration method, an algorithm to extract the rotation axis of a turn-table has been developed. Furthermore, this algorithm can be extended to estimate robustly the initial bounding volume of the object to be modeled. The coarse volume obtained is then carved using a stereo correction method which removes the disadvantages of silhouette-based reconstruction by photoconsistency. The concept of surface particles is adapted in order to extract a texture map for the model. Some existing metrics are used to measure the quality of the reconstructed models.

scholarly journals RESEARCH ON THE FACTORS AFFECTING THE ACCURACY OF THREE-DIMENSIONAL RECONSTRUCTION MODEL OF ROTOR UAV ARCHAEOLOGICAL SITES

2019 ◽  
Vol XLII-4/W20 ◽  
pp. 111-118
Author(s):  
X. Zheng ◽  
Y. G. Hu
Keyword(s):  
New Technologies ◽  
Three Dimensional ◽  
Archaeological Sites ◽  
Three Dimensional Reconstruction ◽  
Factors Affecting ◽  
Dimensional Reconstruction ◽  
Archaeological Work ◽  
Heritage Protection ◽  
Cultural Relics

Abstract. The work of cultural heritage protection has risen to the national strategic level in China in recent years. More and more high and new technologies are applied in the fields of cultural relics and archaeology, heritage protection, etc., including the drone photography technology. Because the cultural protection industry has high requirements for the accuracy of reconstruction results, it puts forward higher requirements for the three-dimensional reconstruction of drones. In this paper, the factors affecting the reconstruction accuracy of the rotor unmanned opportunity are analyzed and summarized in the archaeological protection of cultural relics, and the technical integration of the oblique photography technology in archaeological work is carried out to improve the quality of modeling results.

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