Fast calculation method of computer-generated hologram using a depth camera with point cloud gridding

2018 ◽  
Vol 411 ◽  
pp. 166-169 ◽  
Author(s):  
Yu Zhao ◽  
Chen-Xiao Shi ◽  
Ki-Chul Kwon ◽  
Yan-Ling Piao ◽  
Mei-Lan Piao ◽  
...  
Keyword(s):  
Calculation Method ◽  
Point Cloud ◽  
Depth Camera ◽  
Fast Calculation ◽  
Computer Generated Hologram

scholarly journals Comparison of Depth Camera and Terrestrial Laser Scanner in Monitoring Structural Deflections

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 201
Author(s):  
Michael Bekele Maru ◽  
Donghwan Lee ◽  
Kassahun Demissie Tola ◽  
Seunghee Park
Keyword(s):  
Optical Sensors ◽  
Point Cloud ◽  
Three Dimensional ◽  
Laser Scanner ◽  
Point Clouds ◽  
Depth Camera ◽  
Terrestrial Laser Scanner ◽  
Cloud Data ◽  
3D Point Clouds ◽  
3D Information

Modeling a structure in the virtual world using three-dimensional (3D) information enhances our understanding, while also aiding in the visualization, of how a structure reacts to any disturbance. Generally, 3D point clouds are used for determining structural behavioral changes. Light detection and ranging (LiDAR) is one of the crucial ways by which a 3D point cloud dataset can be generated. Additionally, 3D cameras are commonly used to develop a point cloud containing many points on the external surface of an object around it. The main objective of this study was to compare the performance of optical sensors, namely a depth camera (DC) and terrestrial laser scanner (TLS) in estimating structural deflection. We also utilized bilateral filtering techniques, which are commonly used in image processing, on the point cloud data for enhancing their accuracy and increasing the application prospects of these sensors in structure health monitoring. The results from these sensors were validated by comparing them with the outputs from a linear variable differential transformer sensor, which was mounted on the beam during an indoor experiment. The results showed that the datasets obtained from both the sensors were acceptable for nominal deflections of 3 mm and above because the error range was less than ±10%. However, the result obtained from the TLS were better than those obtained from the DC.

scholarly journals Proton impact ionization and a fast calculation method

2013 ◽  
Vol 118 (8) ◽  
pp. 5369-5378 ◽  
Author(s):  
Xiaohua Fang ◽  
Dirk Lummerzheim ◽  
Charles H. Jackman
Keyword(s):  
Calculation Method ◽  
Impact Ionization ◽  
Fast Calculation ◽  
Proton Impact
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