scholarly journals A JOINT CALIBRATION METHOD OF 3D IMAGES ACQUIRED BY COMMON OPTICAL PATH PAYLOAD

2019 ◽  
Vol XLII-2/W16 ◽  
pp. 221-226
Author(s):  
G. E. Teng ◽  
M. Zhou ◽  
J. Hu ◽  
H. H. Wu ◽  
W. Li ◽  
...  
Keyword(s):  
Time Synchronization ◽  
Three Dimensional ◽  
Calibration Method ◽  
Optical Path ◽  
3D Images ◽  
Linear Ccd ◽  
New Type ◽  
The Common ◽  
Misalignment Error

<p><strong>Abstract.</strong> The common optical path payload is a new type of imaging payload that can acquire LiDAR data and CCD images simultaneously. This new payload integrates the linear LiDAR and linear CCD images according to the common optical system, and achieves the registration of LiDAR point cloud and CCD images by the alignment of common aperture optical axis and time synchronization control in the front of hardware. Based on the fixed matching relationship between CCD probes and LiDAR probes offered by optical path of common, this paper proposes a joint calibration method, which reduces the ranging error and misalignment error. And the results verify that this method can effectively improve the quality of the three-dimensional images. The standard deviations of validation area and roof are improved from 0.54&amp;thinsp;m to 0.14&amp;thinsp;m and 1.83&amp;thinsp;m to 0.26&amp;thinsp;m respectively.</p>

Filtering Algorithms for 3D Range Image Analysis

2013 ◽  
Vol 199 ◽  
pp. 235-240 ◽  
Author(s):  
Andrzej Sioma
Keyword(s):  
Image Analysis ◽  
Vision System ◽  
Three Dimensional ◽  
Range Image ◽  
Construction Technique ◽  
3D Images ◽  
Image Construction ◽  
Dimensional Image ◽  
Three Dimensional Vision

This article is devoted to the methods of image analysis used in three-dimensional vision systems. Based on a sample set of 3D images, their defects resulting from the adopted three-dimensional image construction technique are discussed. Those defects are discussed in relation to the following parameters: speed of the vision system, power of the laser, laser mode, laser arrangement relative to the vision system sensor and relative to the tested surface. To illustrate the cases discussed, images showing the effects of selected parameters on the quality of mapping of the tested object onto a three-dimensional image were presented. The next part of the article discusses methods of range image filtering that removes or reduces the importance of defects of the adopted method in any control and measuring tasks. Particular attention is given to methods of removing data described as missing data.

scholarly journals Wavelength-Selective Phase-Shifting Digital Holography: Color Three-Dimensional Imaging Ability in Relation to Bit Depth of Wavelength-Multiplexed Holograms

2018 ◽  
Vol 8 (12) ◽  
pp. 2410 ◽  
Author(s):  
Tatsuki Tahara ◽  
Reo Otani ◽  
Yasuhiro Takaki
Keyword(s):  
Digital Holography ◽  
3D Imaging ◽  
Dynamic Range ◽  
Three Dimensional ◽  
Image Sensor ◽  
Phase Shifting ◽  
3D Images ◽  
Wavelength Resolution ◽  
The Relationship

The quality of reconstructed images in relation to the bit depth of holograms formed by wavelength-selective phase-shifting digital holography was investigated. Wavelength-selective phase-shifting digital holography is a technique to obtain multiwavelength three-dimensional (3D) images with a full space-bandwidth product of an image sensor from wavelength-multiplexed phase-shifted holograms and has been proposed since 2013. The bit resolution required to obtain a multiwavelength holographic image was quantitatively and experimentally evaluated, and the relationship between wavelength resolution and dynamic range of an image sensor was numerically simulated. The results indicate that two-bit resolution per wavelength is required to conduct color 3D imaging.

Research of Advancing Mechanism with Three Circular Arc Equidistant Profile Connection of Drill

2011 ◽  
Vol 179-180 ◽  
pp. 895-898
Author(s):  
You Xin Luo ◽  
Heng Shu Li ◽  
Hui Jun Wen ◽  
Yu Zhou
Keyword(s):  
Stress Concentration ◽  
Three Dimensional ◽  
Circular Arc ◽  
Three Dimensional Modeling ◽  
Rock Drill ◽  
Dimensional Modeling ◽  
Intermediate Shaft ◽  
New Type ◽  
Loaded Rock ◽  
The Common

Study the existing advancing mechanism of drill, analyze the disadvantage of the flat key and the spline, and the feature of the three circular arc equidistant profile connection. Taking the common chain advancing mechanism as basis, using three circular arc equidistant curve to make sprocket bore and intermediate shaft external cylindrical fit constitute the three circular arc equidistant profile keyless connection. Then introduce the advancing mechanism with three circular arc equidistant profile connection of drill. Applying Solidworks2010, we created the three-dimensional modeling of the mechanism, which lay the foundation for the further research and application. The new type advancing mechanism has many advantages, such as automatic-centering accurately, convenient in assembling and disassembling, eliminating the stress concentration, simplicity of the fit section，transferring bigger torque, suitable for heavy-loaded rock drill machine.

scholarly journals Studying the Recent Improvements in Holograms for Three-Dimensional Display

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Hamed Abbasi ◽  
Talie Zarei ◽  
Neda Jalali Farahani ◽  
Adeleh Granmayeh Rad
Keyword(s):  
Three Dimensional ◽  
3D Images ◽  
3D Displays ◽  
Three Dimensional Display ◽  
Three Dimensional Images

Displayers tend to become three-dimensional. The most advantage of holographic 3D displays is the possibility to observe 3D images without using glasses. The quality of created images by this method has surprised everyone. In this paper, the experimental steps of making a transmission hologram have been mentioned. In what follows, current advances of this science-art will be discussed. The aim of this paper is to study the recent improvements in creating three-dimensional images and videos by means of holographic techniques. In the last section we discuss the potentials of holography to be applied in future.

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 Bioclimatic Architecture

2021 ◽  
Vol 102 ◽  
pp. 03002
Author(s):  
Jimena Ávalos ◽  
Regina Villarreal ◽  
Valeria Cárdenas ◽  
Ana Cristina García-Luna Romero
Keyword(s):  
Climate Change ◽  
Well Being ◽  
Construction Sector ◽  
Construction Process ◽  
New Developments ◽  
Know How ◽  
New Type ◽  
The Common ◽  
The Impact

We are living through serious problems of environmental pollution, which causes great risks to the well-being of the population. These problems are presented by the bad planning of urban growth, and many times in very bad quality. Industrialization grows in the cities without having an order and an appropriate planning to avoid the damage in our environment. The construction sector is largely responsible for this global pollution that is experienced today. As the years go by, architects aim to improve the quality of their construction and improve our quality of life. New projects arise with strategy and planning, developing a new type of architecture which contemplates the damage it would do to the environment and how this issue could be solved based on its construction development. The profession of architects, or urban planners who are involved in the development of cities, are responsible for creating new developments by designing the impact of climate change. The architectural community carries a great responsibility in designing with the flows of materials, energy, climate change, causes and solutions in mind. Architecture must involve sustainability in its construction process and know how to implement it to cause an environmental impact to satisfy the common welfare.

scholarly journals Application of Framework of New TQM to Healthcare

2016 ◽  
Vol 1 (1) ◽  
Keyword(s):  
Three Dimensional ◽  
Healthcare Management ◽  
Medical Institution ◽  
Management Process ◽  
View Point ◽  
The Common ◽  
Product And Process ◽  
Definition Of ◽  
Value Model

In late year, strictness of social environment of healthcare management of medical institution is changing, and medical institution should solve many Problems and Issues. In the previous study, we suggested the concept of new TQM. Also, in the previous study, we suggested the target domains and entities of product and process based on the TQM Matrix and view point of Three Dimensional Unification Value Models for managing quality of company. Furthermore, in the previous study, we suggest the Common Management Process for organizations. Based on the above suggestions, in this paper, we would like to propose the application of new TQM for Healthcare management from the view point of the criteria of new TQM based on the consideration of more precise definition of TQM Matrix and Three Dimensional Unification Value Model of Product and Process.

scholarly journals Assessment of Tooth Preparations Submitted to Dental Laboratories for Fabrication of Monolithic Zirconia Crowns

2021 ◽  
Vol 9 (10) ◽  
pp. 112
Author(s):  
Ramtin Sadid-Zadeh ◽  
Hadjer Sahraoui ◽  
Brian Lawson ◽  
Robert Cox
Keyword(s):  
Three Dimensional ◽  
Finish Line ◽  
Posterior Teeth ◽  
3D Images ◽  
Line Angle ◽  
Zirconia Crowns ◽  
Monolithic Zirconia ◽  
Tooth Preparation ◽  
Line Design

Purpose: The objective of this study was to assess the quality of posterior teeth prepared for monolithic zirconia crowns. Materials and Methods: A total of 392 STL-files of posterior preparations for monolithic zirconia crowns were evaluated in this study. Three-dimensional (3D) images were evaluated using a software (3D Viewer; 3Shape A/S, Copenhagen, Denmark) for finish line design, finish line width, occluso-cervical dimension, total occlusal convergence (TOC), intercuspal angulation, finish line quality, line angle form, and presence or absence of undercut at the axial wall and unsupported lip of enamel. The assessment was performed by two calibrated evaluators. Then, data were descriptively analyzed. Data for occluso-cervical dimension and TOC were descriptively analyzed according to their location. Results: Thirty-nine percent of premolars, 77% of first molars, and 91% of second molars had an average occluso-cervical dimension of less than 3 mm (premolars) and 4 mm (molars), with most of the preparations having a TOC of more than 20 degrees. More than 50% of preparations had undercut, unsupported enamel and/or unacceptable finish line quality. Conclusions: The quality of tooth preparation including finish line quality, absence of unsupported enamel and undercut at the axial wall should be evaluated when preparing monolithic zirconia crowns.

Measurements in 3D images

1991 ◽  
Vol 49 ◽  
pp. 408-409
Author(s):  
John C. Russ
Keyword(s):  
Three Dimensional ◽  
Image Plane ◽  
X Rays ◽  
Traditional Use ◽  
3D Images ◽  
Confocal Scanning Laser Microscope ◽  
Hard Materials ◽  
Depth Direction ◽  
Confocal Scanning ◽  
Confocal Scanning Laser

Three-dimensional (3D) images consisting of arrays of voxels can now be routinely obtained from several different types of microscopes. These include both the transmission and emission modes of the confocal scanning laser microscope (but not its most common reflection mode), the secondary ion mass spectrometer, and computed tomography using electrons, X-rays or other signals. Compared to the traditional use of serial sectioning (which includes sequential polishing of hard materials), these newer techniques eliminate difficulties of alignment of slices, and maintain uniform resolution in the depth direction. However, the resolution in the z-direction may be different from that within each image plane, which makes the voxels non-cubic and creates some difficulties for subsequent analysis.

Scanning Electron Microscopy in Hybrid Microelectronics

1976 ◽  
Vol 34 ◽  
pp. 456-457
Author(s):  
S. Khadpe ◽  
R. Faryniak
Keyword(s):  
Integrated Circuits ◽  
Thick Film ◽  
Integrated Circuit ◽  
Failure Modes ◽  
Three Dimensional ◽  
Circuit Components ◽  
Hybrid Microcircuit ◽  
Electrical Connections ◽  
Scanning Electron

The Scanning Electron Microscope (SEM) is an important tool in Thick Film Hybrid Microcircuits Manufacturing because of its large depth of focus and three dimensional capability. This paper discusses some of the important areas in which the SEM is used to monitor process control and component failure modes during the various stages of manufacture of a typical hybrid microcircuit.Figure 1 shows a thick film hybrid microcircuit used in a Motorola Paging Receiver. The circuit consists of thick film resistors and conductors screened and fired on a ceramic (aluminum oxide) substrate. Two integrated circuit dice are bonded to the conductors by means of conductive epoxy and electrical connections from each integrated circuit to the substrate are made by ultrasonically bonding 1 mil aluminum wires from the die pads to appropriate conductor pads on the substrate. In addition to the integrated circuits and the resistors, the circuit includes seven chip capacitors soldered onto the substrate. Some of the important considerations involved in the selection and reliability aspects of the hybrid circuit components are: (a) the quality of the substrate; (b) the surface structure of the thick film conductors; (c) the metallization characteristics of the integrated circuit; and (d) the quality of the wire bond interconnections.

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