A Grid Recognition-Based Calibration Algorithm for Measuring System

2012 ◽  
Author(s):  
Lina Xiang ◽  
Zhangli Lan ◽  
Hong Zhang
Keyword(s):  
Measuring System ◽  
Calibration Algorithm

An improved self-calibration algorithm for multilateration coordinates measuring system

2016 ◽  
Author(s):  
Dongjing Miao ◽  
Guolei Wang ◽  
Jianshuan Li ◽  
Mingzhao He ◽  
Yao Kang
Keyword(s):  
Measuring System ◽  
Self Calibration ◽  
Calibration Algorithm

6R Instrumented Spatial Linkages for Anatomical Joint Motion Measurement—Part 2: Calibration

1992 ◽  
Vol 114 (1) ◽  
pp. 101-110 ◽  
Author(s):  
S. J. Kirstukas ◽  
J. L. Lewis ◽  
A. G. Erdman
Keyword(s):  
Measuring System ◽  
Joint Motion ◽  
Electrical Parameters ◽  
Knee Motion ◽  
Anatomical Position ◽  
Calibration Algorithm ◽  
Calibration Device ◽  
Spatial Linkages ◽  
Six Degree Of Freedom ◽  
Interdependent Relationships

The six-revolute-joint instrumented spatial linkage (6R ISL) is often the measurement system of choice for monitoring motion of anatomical joints. However, due to tolerances of the linkage parameters, the system may not be as accurate as desired. A calibration algorithm and associated calibration device have been developed to refine the initial measurements of the ISL’s mechanical and electrical parameters so that the measurement of six-degree-of-freedom motion will be most accurate within the workspace of the anatomical joint. The algorithm adjusts the magnitudes of selected linkage parameters to reduce the squared differences between the six known and calculated anatomical position parameters at all the calibration positions. Weighting is permitted so as to obtain a linkage parameter set that is specialized for measuring certain anatomical position parameters. Output of the algorithm includes estimates of the measuring system accuracy. For a particular knee-motion-measuring ISL and calibration device, several interdependent design parameter relationships have been identified. These interdependent relationships are due to the configuration of the ISL and calibration device, the number of calibration positions, and the limited resolution of the devices that monitor the position of the linkage joints. It is shown that if interdependence is not eliminated, then the resulting ISL parameter set will not be accurate in measuring motion outside of the calibration positions, even though these positions are within the ISL workspace.

Calibration Algorithm for Structured Light 3D Vision Measuring System

2008 ◽  
Author(s):  
Haihua Cui ◽  
Ning Dai ◽  
Tianran Yuan ◽  
Xiaosheng Cheng ◽  
Wenhe Liao
Keyword(s):  
Structured Light ◽  
Measuring System ◽  
3D Vision ◽  
Calibration Algorithm

Binocular Vision Measurement of Distance Based on Vehicle Logo Location

2012 ◽  
Vol 229-231 ◽  
pp. 1154-1157 ◽  
Author(s):  
A Lin Hou ◽  
Juan Chen ◽  
Zhi Juan Jin ◽  
Qing Liao ◽  
Ying Geng
Keyword(s):  
Binocular Vision ◽  
Image Plane ◽  
Spatial Location ◽  
Measuring System ◽  
Target Vehicle ◽  
Vision Measurement ◽  
World Coordinate System ◽  
Calibration Algorithm ◽  
Image Pairs ◽  
Rapid Processing

A measuring system of vehicle distance is proposed on the basis of binocular vision using location information of the vehicle logo. The spatial location of the target vehicle can be obtained by the pixel coordinates in the image plane due to the logo is sited at the central axis of the vehicle. The camera calibration algorithm is accomplished by conversion relation matrix between the world coordinate system and the image coordinate. And then the binocular logo image pairs are matched. Finally, the distance of the target vehicle is calculated. The simulation experiments have been done and the results show that the proposed method of distance measurement has better performance with rapid processing and higher accuracy.

A Study of Automatic Calibration in Dual Linear-CCD Camera Intersection Measuring System

2012 ◽  
Vol 571 ◽  
pp. 219-223 ◽  
Author(s):  
Xiang Chen ◽  
Jun Yong Tang
Keyword(s):  
Ccd Camera ◽  
System Structure ◽  
Measuring System ◽  
Automatic Calibration ◽  
Structure Parameter ◽  
Optimal Test ◽  
Linear Ccd ◽  
Calibration Algorithm ◽  
Technical Details ◽  
Made In

CCD intersection measuring is an untouched technique that used to measure the coordinates of aerial moving targets, which has been widely applied in optimal test. At present, the main problem is to improve the measuring precision, and much research has been made in system structure parameter optimization, error analysis, intersection principle improving and so on. But when using the measuring system, users are always required to be clear about the working elements of the system, which restricts its usage. In addition, the instruments are disposed and many inputs must be measured manually. As a result, precision improving becomes a difficult work. After finding out the mathematic corresponding relationship between input and output variables of measuring system based on intersection measuring principle, the paper comes up with an automatic calibration algorithm wrapping up the technical details, which makes the complicated principle transparent to users. The setup and parameter adjustment of measuring system with much less manual work has been simplified and deep advancement in precision improving becomes possible.

High-voltage monitoring by the fiber-optic recirculating measuring system

2020 ◽  
pp. 38-44
Author(s):  
A. V. Polyakov ◽  
M. A. Ksenofontov
Keyword(s):  
Optical Fibers ◽  
High Voltage ◽  
Optical Sensors ◽  
Electromagnetic Interference ◽  
Fiber Optic ◽  
Electric Power Industry ◽  
Measuring System ◽  
Voltage Range ◽  
External Electromagnetic Fields ◽  
Optic Communication

Optical technologies for measuring electrical quantities attract great attention due to their unique properties and significant advantages over other technologies used in high-voltage electric power industry: the use of optical fibers ensures high stability of measuring equipment to electromagnetic interference and galvanic isolation of high-voltage sensors; external electromagnetic fields do not influence the data transmitted from optical sensors via fiber-optic communication lines; problems associated with ground loops are eliminated, there are no side electromagnetic radiation and crosstalk between the channels. The structure and operation principle of a quasi-distributed fiber-optic high-voltage monitoring system is presented. The sensitive element is a combination of a piezo-ceramic tube with an optical fiber wound around it. The device uses reverse transverse piezoelectric effect. The measurement principle is based on recording the change in the recirculation frequency under the applied voltage influence. When the measuring sections are arranged in ascending order of the measured effective voltages relative to the receiving-transmitting unit, a relative resolution of 0,3–0,45 % is achieved for the PZT-5H and 0,8–1,2 % for the PZT-4 in the voltage range 20–150 kV.

Information and measuring system based on the device «Polyreotest PRT-2» for wheat hardness control

2020 ◽  
Vol 29 (8) ◽  
pp. 57-61
Author(s):  
V.Y. Chernykh ◽  
◽  
E.V. Karpushina ◽  
N. Yu. Bykova ◽  
A.S. Maksimov ◽  
...  
Keyword(s):  
Measuring System
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