Measurement technology of model's positions and attitudes with high accuracy on the 200 m free flight ballistic range

2017 ◽  
Author(s):  
Fawei Ke ◽  
Zonghao Wang
Keyword(s):  
High Accuracy ◽  
Measurement Technology ◽  
Free Flight ◽  
Ballistic Range

Transonic Flow Field Analysis of a Free Flight Capsule using Ballistic Range

2020 ◽  
Author(s):  
Hideki Kiritani ◽  
Naoki Tanaka ◽  
Kiyonobu Ohtani ◽  
Koji Fujita ◽  
Hiroki Nagai
Keyword(s):  
Flow Field ◽  
Transonic Flow ◽  
Field Analysis ◽  
Free Flight ◽  
Ballistic Range ◽  
Flow Field Analysis

High-Accuracy Shape Construction of Porcelain and Exhibiting on Web

2011 ◽  
Vol 121-126 ◽  
pp. 2774-2778
Author(s):  
Hai Bin Wu ◽  
Li Quan Wang ◽  
Jing Yan Cui ◽  
Yang Jiao ◽  
Xiao Yang Yu
Keyword(s):  
Measurement Accuracy ◽  
Structured Light ◽  
Mathematic Model ◽  
Gray Code ◽  
High Accuracy ◽  
Measurement Technology ◽  
Black Stripe ◽  
White Stripe ◽  
Edge Location ◽  
High Reflectance

The key of 3D measurement technology based on coded structured light for high-accuracy reconstruction of porcelain exhibited on Web, is to ensure measurement accuracy and anti-interference capability on high reflectance surface. So an edge Gray code method for structured light system and related technologies are proposed under interference by high reflectance ratio and color of measured surface. Firstly, encoding and decoding principles by Gray code stripe edge reduce theoretical quantization error and decoding error against traditional Gray code, so measurement accuracy is improved. Secondly, stripe edge sub-pixel location method based on grey curve intersecting points is designed to reduce edge location error caused by diffusion from white stripe to black stripe. Measurement system was established according to mathematic model. Experimental results show that error of measured high reflectance unicolor standard plane is 0.60.8mm, and reconstructed porcelain shape has same visual effect as the real one. Finally, based on Java 3D, interactively exhibiting on Web was explored.

Research on Volume Measurement Technology for Rail Tanker Based on Computer Vision

2012 ◽  
Vol 157-158 ◽  
pp. 646-651
Author(s):  
Ji Bin Zhao ◽  
Ren Bo Xia ◽  
Wei Jun Liu ◽  
Tao Fu ◽  
Yi Jun Huang ◽  
...  
Keyword(s):  
Computer Vision ◽  
Volume Measurement ◽  
Scattered Data ◽  
High Accuracy ◽  
Measurement Technology ◽  
Identification Algorithm ◽  
Localization Algorithm ◽  
Complex Environment ◽  
Accurate Identification ◽  
Novel Method

In this paper, a computer vision based volume measurement system for rail tanker is proposed. Considering the complex environment, we propose an accurate identification algorithm of coded point and a precise localization algorithm. By investigating the epipolar geometry among three views, this paper develops a novel method for metric reconstruction of a scene based on the trilinear relations. Through the method of ordering incomplete scattered data presented, we construct a series of cross-section contours for a tanker and achieve a precise reconstruction of the surface of the tanker. Experiments show that, the volume measurement method for rail tanker based on computer vision can be operated with simplicity and high accuracy.

scholarly journals Design and Analysis of High-Accuracy Telecentric Surface Reconstruction System Based on Line Laser

2021 ◽  
Vol 11 (2) ◽  
pp. 488
Author(s):  
Linshen Yao ◽  
Haibo Liu
Keyword(s):  
Computer Vision ◽  
Surface Reconstruction ◽  
High Accuracy ◽  
Measurement Technology ◽  
Single Camera ◽  
One Dimensional ◽  
Contact Measurement ◽  
Laser Plane ◽  
On Line ◽  
Telecentric Lens

Non-contact measurement technology based on triangulation with cameras is extensively applied to the development of computer vision. However, the accuracy of the technology is generally not satisfactory enough. The application of telecentric lenses can significantly improve the accuracy, but the view of telecentric lenses is limited due to their structure. To address these challenges, a telecentric surface reconstruction system is designed for surface detection, which consists of a single camera with a telecentric lens, line laser generator and one-dimensional displacement platform. The designed system can reconstruct the surface with high accuracy. The measured region is expanded with the used of the displacement platform. To achieve high-accuracy surface reconstruction, we propose a method based on a checkerboard to calibrate the designed system, including line laser plane and motor direction of the displacement platform. Based on the calibrated system, the object under the line laser is measured, and the results of lines are assembled to make the final surface reconstruction. The results show that the designed system can reconstruct a region of 20×40 mm2, up to the accuracy of micron order.

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