High speed phase shifting digital holography for real-time three- dimensional display

2005 ◽  
Author(s):  
O. Matoba ◽  
K. Nitta ◽  
T. Yoshimura ◽  
B. Javidi
Keyword(s):  
Real Time ◽  
High Speed ◽  
Digital Holography ◽  
Three Dimensional ◽  
Phase Shifting ◽  
Three Dimensional Display

scholarly journals Prevention of Mountain Disasters and Maintenance of Residential Area through Real-Time Terrain Rendering

2021 ◽  
Vol 13 (5) ◽  
pp. 2950
Author(s):  
Su-Kyung Sung ◽  
Eun-Seok Lee ◽  
Byeong-Seok Shin
Keyword(s):  
Real Time ◽  
Graphics Processing Units ◽  
High Speed ◽  
Large Scale ◽  
Civil Engineering ◽  
Three Dimensional ◽  
Sampled Data ◽  
Residential Areas ◽  
Terrain Rendering ◽  
Mountain Disasters

Climate change increases the frequency of localized heavy rains and typhoons. As a result, mountain disasters, such as landslides and earthworks, continue to occur, causing damage to roads and residential areas downstream. Moreover, large-scale civil engineering works, including dam construction, cause rapid changes in the terrain, which harm the stability of residential areas. Disasters, such as landslides and earthenware, occur extensively, and there are limitations in the field of investigation; thus, there are many studies being conducted to model terrain geometrically and to observe changes in terrain according to external factors. However, conventional topography methods are expressed in a way that can only be interpreted by people with specialized knowledge. Therefore, there is a lack of consideration for three-dimensional visualization that helps non-experts understand. We need a way to express changes in terrain in real time and to make it intuitive for non-experts to understand. In conventional height-based terrain modeling and simulation, there is a problem in which some of the sampled data are irregularly distorted and do not show the exact terrain shape. The proposed method utilizes a hierarchical vertex cohesion map to correct inaccurately modeled terrain caused by uniform height sampling, and to compensate for geometric errors using Hausdorff distances, while not considering only the elevation difference of the terrain. The mesh reconstruction, which triangulates the three-vertex placed at each location and makes it the smallest unit of 3D model data, can be done at high speed on graphics processing units (GPUs). Our experiments confirm that it is possible to express changes in terrain accurately and quickly compared with existing methods. These functions can improve the sustainability of residential spaces by predicting the damage caused by mountainous disasters or civil engineering works around the city and make it easy for non-experts to understand.

Parallel Phase-Shifting Digital Holography Capable of Simultaneously Capturing Visible and Invisible Three-Dimensional Information

2010 ◽  
Vol 6 (10) ◽  
pp. 472-478 ◽  
Author(s):  
Takashi Kakue ◽  
Kenichi Ito ◽  
Tatsuki Tahara ◽  
Yasuhiro Awatsuji ◽  
Kenzo Nishio ◽  
...  
Keyword(s):  
Digital Holography ◽  
Three Dimensional ◽  
Phase Shifting

Review of three-dimensional imaging of dynamic objects by parallel phase-shifting digital holography

2018 ◽  
Vol 57 (06) ◽  
pp. 1 ◽  
Author(s):  
Takahito Fukuda ◽  
Yasuhiro Awatsuji ◽  
Peng Xia ◽  
Takashi Kakue ◽  
Kenzo Nishio ◽  
...  
Keyword(s):  
Digital Holography ◽  
Three Dimensional ◽  
Phase Shifting ◽  
Three Dimensional Imaging ◽  
Dynamic Objects

Measurement of Three-Dimensional Particle Distribution by Tomographic Digital Holography

2015 ◽  
Author(s):  
Shunsuke Tani ◽  
Yohsuke Tanaka ◽  
Shigeru Murata
Keyword(s):  
Pattern Matching ◽  
High Speed ◽  
Digital Holography ◽  
Particle Distribution ◽  
Three Dimensional ◽  
Particle Diameter ◽  
Average Diameter ◽  
Calibration Device ◽  
Calibration Accuracy ◽  
Static Flow

This paper presents a measurement of three-dimensional particle distribution by tomographic digital holography. Holographic patterns of particles (particle Reynolds number Rep=0.79, average diameter dp=73.5 μm) settling in a static flow were recorded by two high speed cameras orthogonal to each other. Cameras were calibrated by a proposed method using a calibration device and a pattern matching. The calibration accuracy of the method is within 0.34 times of particle diameter.

High-speed parallel phase-shifting digital holography

2011 ◽  
Author(s):  
Takashi Kakue ◽  
Tatsuki Tahara ◽  
Yasuhiro Awatsuji ◽  
Shogo Ura ◽  
Kenzo Nishio ◽  
...  
Keyword(s):  
High Speed ◽  
Digital Holography ◽  
Phase Shifting

Image Processing for Optical Methods to Analyze Shape, Deformation, Stress and Strain

2006 ◽  
Vol 326-328 ◽  
pp. 13-18
Author(s):  
Yoshiharu Morimoto
Keyword(s):  
Image Processing ◽  
Real Time ◽  
High Speed ◽  
Video Camera ◽  
Image Sensor ◽  
Phase Shifting ◽  
Optical Methods ◽  
Shape Deformation ◽  
Stress And Strain ◽  
Deformation Stress

The authors have been developing some novel methods to measure shape, deformation, stress and strain of structures using optical methods and image processing as follows: (1) Phase analysis methods using Fourier, wavelet or Gabor transforms, etc., (2) Real-time 2-D strain measurement using moiré interferometry, (3) Scanning moiré method using thinning-out of scanning lines and a DMD camera (4) Strain rate distribution measurement by a high-speed video camera, (5) Real-time integrated phase-shifting method, (6) Shape measurement methods using multi-reference planes, a linear image sensor, or a frequency modulated grating, and (7) Windowed phase-shifting digital holographic interferometry (WPSDHI). Theories of these methods and some applications are introduced. The most accurate result is 88 picometer standard deviation of errors using the WPSDHI.

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