1P1-L05 High Speed 3D Measurement Module using Profile Sensor : The Study of Distortion Correction Method using a Flat Panel LCD and OpenCV(Future of Optronics)

2012 ◽  
Vol 2012 (0) ◽  
pp. _1P1-L05_1-_1P1-L05_4
Author(s):  
Yoshinori MATSUI ◽  
Munenori TAKUMI ◽  
Tamiki TAKEMORI ◽  
Haruyoshi TOYODA
Keyword(s):  
High Speed ◽  
Correction Method ◽  
Distortion Correction ◽  
3D Measurement ◽  
Flat Panel

scholarly journals High-Speed Optical Resolution Photoacoustic Microscopy With a MEMS Scanner: Novel and Simple Distortion Correction Method

2021 ◽  
Author(s):  
Ryo Shintate ◽  
Takuro Ishii ◽  
Joongho Ahn ◽  
Jin Young Kim ◽  
Chulhong Kim ◽  
...  
Keyword(s):  
High Speed ◽  
Optical Resolution ◽  
Calibration Method ◽  
Correction Method ◽  
Distortion Correction ◽  
Photoacoustic Microscopy ◽  
Imaging Tool ◽  
Imaging Sequence ◽  
Biological Interpretation

Abstract Optical resolution photoacoustic microscopy (OR-PAM) is a remarkable biomedical imaging tool that can selectively visualize microtissues with optical-dependent high resolution. However, traditional OR-PAM using mechanical stages provides slow imaging speed, making biological interpretation of in-vivo tissue difficult. Here, we developed a high-speed OR-PAM using a recently commercialized MEMS mirror. This system (MEMS-OR-PAM) consisted of a 1-axis MEMS mirror and a mechanical stage. Furthermore, this study proposed a novel calibration method that quickly removes the spatial distortion caused by fast MEMS scanning. The proposed calibration method needs to run imaging sequence only once using a ruler target and it can easily correct distortions caused by both the scan geometry of the MEMS mirror and its nonlinear motion. The combination of the MEMS-OR-PAM and the distortion correction method was verified by three experiments.; 1) Leaf skeleton phantom imaging to test the distortion correction efficacy.; 2) Spatial resolution and depth of focus (DOF) measurement for the system performance.; 3) In-Vivo finger capillaries imaging to verify their biomedical use. The results showed that the combination could achieve a high-speed (32 sec in 2 mm×4 mm) and high-lateral resolution (~6 µm) imaging capability and precisely visualize the circulating structure of the finger capillaries.

Division model-based distortion correction method for head-mounted displays

2019 ◽  
Vol 27 (3) ◽  
pp. 172-180 ◽  
Author(s):  
Xue Xiao ◽  
Lin Zhang ◽  
Xiao Lin ◽  
Jinliang Zang ◽  
Xiaodi Tan
Keyword(s):  
Correction Method ◽  
Distortion Correction ◽  
Model Based ◽  
Head Mounted Displays ◽  
Division Model

scholarly journals Blockage Correction and Reynolds Number Dependency of an Alpine Skier: A Comparison Between Two Closed-Section Wind Tunnels

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 19
Author(s):  
Ola Elfmark ◽  
Robert Reid ◽  
Lars Morten Bardal
Keyword(s):  
Reynolds Number ◽  
High Speed ◽  
Absolute Error ◽  
Reynolds Numbers ◽  
Correction Method ◽  
Wind Tunnels ◽  
Alpine Skier ◽  
Blockage Correction ◽  
Reynolds Number Dependency ◽  
The Impact

The purpose of this study was to investigate the impact of blockage effect and Reynolds Number dependency by comparing measurements of an alpine skier in standardized positions between two wind tunnels with varying blockage ratios and speed ranges. The results indicated significant blockage effects which need to be corrected for accurate comparison between tunnels, or for generalization to performance in the field. Using an optimized blockage constant, Maskell’s blockage correction method improved the mean absolute error between the two wind tunnels from 7.7% to 2.2%. At lower Reynolds Numbers (<8 × 105, or approximately 25 m/s in this case), skier drag changed significantly with Reynolds Number, indicating the importance of testing at competition specific wind speeds. However, at Reynolds Numbers above 8 × 105, skier drag remained relatively constant for the tested positions. This may be advantageous when testing athletes from high speed sports since testing at slightly lower speeds may not only be safer, but may also allow the athlete to reliably maintain difficult positions during measurements.

Numerical Investigations of Centrifugal Compressor Flows With Tip Leakage Using a Pressure Correction Method

1993 ◽  
Author(s):  
A. Tourlidakis ◽  
R. L. Elder
Keyword(s):  
Flow Pattern ◽  
High Speed ◽  
Stokes Equations ◽  
Correction Method ◽  
Secondary Flows ◽  
Tip Clearance ◽  
Physical Models ◽  
Wake Flow ◽  
Operating Characteristics ◽  
Pressure Correction

In this paper, a three-dimensional computational model for the solution of the time-averaged Navier-Stokes equations, based on a pressure correction method and the k-ε turbulence model, is presented and implemented for the viscous flow modelling through a series of centrifugal compressors. Theoretical calculations with the current fully elliptic method are carried out and the results are compared critically with available experimental data and with results from other computational models. A radial and two backswept high-speed subsonic compressors with different geometrical and operating characteristics are analysed at design and off-design conditions. In all cases, a wake flow pattern is evident and strong secondary flows are discerned. The tip clearance effects on the relative flow pattern are found to be important and are appropriately simulated. The predictive capability of the current flow model is judged to be encouraging taking into consideration the limitations of the physical models and the numerical schemes involved in the computations.

An oversize correction method of dry density for non-cohesive soils filling the embankment of high-speed railway

2014 ◽  
Vol 58 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Jian Chen ◽  
Qiang Luo ◽  
LiangWei Jiang ◽  
Liang Zhang ◽  
MinZhi Zhao
Keyword(s):  
High Speed ◽  
Correction Method ◽  
Dry Density ◽  
Cohesive Soils ◽  
High Speed Railway
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