The Study of Thread Parameter Based on Machine Vision for Automatic Measurement

2013 ◽  
Vol 401-403 ◽  
pp. 1158-1161
Author(s):  
Jing Chao ◽  
Zhan Feng Liu ◽  
Yan Shu Liu
Keyword(s):  
Machine Vision ◽  
Image Recognition ◽  
Measurement Accuracy ◽  
Linear Array ◽  
Image Data ◽  
Automatic Measurement ◽  
Measuring Method ◽  
Line Measurement ◽  
On Line ◽  
Tooth Type

In order to improve the measurement accuracy of thread parameter and can realize the automatic measurement of parameter, this paper propose a non-contact measuring method which is based on machine vision, we use the industrial linear array CCD with high-precision scan the projection of the thread which in the field of parallel light, using the image recognition, image acquisition, image data processing technology enable your computer finish the pitch diameter, thread pitch, tooth type angle on a non-contact of real-time, on-line measurement. This article also provides detailed measuring method with the main parameters of thread.

scholarly journals Estimation of Secondary Soil Properties by Fusion of Laboratory and On-Line Measured Vis–NIR Spectra

2019 ◽  
Vol 11 (23) ◽  
pp. 2819 ◽  
Author(s):  
Muhammad Abdul Munnaf ◽  
Said Nawar ◽  
Abdul Mounem Mouazen
Keyword(s):  
Soil Properties ◽  
Real Time ◽  
Measurement Accuracy ◽  
Near Infrared ◽  
Diffuse Reflectance Spectroscopy ◽  
Spectral Response ◽  
Nir Spectroscopy ◽  
Accurate Estimation ◽  
Line Measurement ◽  
On Line

Visible and near infrared (vis–NIR) diffuse reflectance spectroscopy has made invaluable contributions to the accurate estimation of soil properties having direct and indirect spectral responses in NIR spectroscopy with measurements made in laboratory, in situ or using on-line (while the sensor is moving) platforms. Measurement accuracies vary with measurement type, for example, accuracy is higher for laboratory than on-line modes. On-line measurement accuracy deteriorates further for secondary (having indirect spectral response) soil properties. Therefore, the aim of this study is to improve on-line measurement accuracy of secondary properties by fusion of laboratory and on-line scanned spectra. Six arable fields were scanned using an on-line sensing platform coupled with a vis–NIR spectrophotometer (CompactSpec by Tec5 Technology for spectroscopy, Germany), with a spectral range of 305–1700 nm. A total of 138 soil samples were collected and used to develop five calibration models: (i) standard, using 100 laboratory scanned samples; (ii) hybrid-1, using 75 laboratory and 25 on-line samples; (iii) hybrid-2, using 50 laboratory and 50 on-line samples; (iv) hybrid-3, using 25 laboratory and 75 on-line samples, and (v) real-time using 100 on-line samples. Partial least squares regression (PLSR) models were developed for soil pH, available potassium (K), magnesium (Mg), calcium (Ca), and sodium (Na) and quality of models were validated using an independent prediction dataset (38 samples). Validation results showed that the standard models with laboratory scanned spectra provided poor to moderate accuracy for on-line prediction, and the hybrid-3 and real-time models provided the best prediction results, although hybrid-2 model with 50% on-line spectra provided equally good results for all properties except for pH and Na. These results suggest that either the real-time model with exclusively on-line spectra or the hybrid model with fusion up to 50% (except for pH and Na) and 75% on-line scanned spectra allows significant improvement of on-line prediction accuracy for secondary soil properties using vis–NIR spectroscopy.

scholarly journals On-line Measurement Method and Technical Scheme of Transmission Line Crossing Point Based on Machine Vision

2021 ◽  
Vol 2143 (1) ◽  
pp. 012035
Author(s):  
Jie Tang ◽  
Zhidu Huang ◽  
Zhimei Cui
Keyword(s):  
Machine Vision ◽  
Transmission Line ◽  
Measurement Method ◽  
Accuracy Measurement ◽  
Line Measurement ◽  
On Line ◽  
Increasing Demand ◽  
Measurement Efficiency ◽  
Crossing Point ◽  
Line Crossing

Abstract With the increasing demand for high voltage and UHV transmission, higher and higher requirements are put forward for transmission line monitoring and fault diagnosis. The traditional line measurement method has many shortcomings, which cannot ensure the measurement accuracy, measurement efficiency and high cost. Based on this, this paper first studies the principle of machine vision on-line measurement, then analyses the on-line measurement process of transmission line crossing point based on machine vision, and finally gives the error source and amelioration measures of transmission line crossing point on-line measurement.

scholarly journals Design of On-line Detecting Device for Groove Wear of Elevator Traction Wheel

2021 ◽  
Vol 2095 (1) ◽  
pp. 012073
Author(s):  
Xiaomin Shi ◽  
Senjun Jia
Keyword(s):  
Computer Simulation ◽  
Machine Vision ◽  
Measurement Accuracy ◽  
Detection Method ◽  
Work Piece ◽  
Measuring Device ◽  
Vision Inspection ◽  
On Line ◽  
Actual Profile ◽  
Machine Vision Inspection

Abstract After the wear of elevator traction wheel, there is a traditional detection method which can measure the geometric dimensions of wheel groove. But this method has low measurement accuracy and cannot accurately reflect the actual profile of wheel groove. By means of the machine vision inspection technology, the profile of the traction wheel groove can be measured, a new detection method is proposed in this paper, and the corresponding measuring device is designed in detail. At the same time, with help of the computer simulation, the processing of the work piece image is used. In this method, the size and profile of the wheel groove of the traction wheel can be measured more accurately and quickly to reflect the actual wear value of the wheel groove.

Capacitance Automatic Measurement Method of the Thickness of Liquid Film on Plat Form

2008 ◽  
Vol 381-382 ◽  
pp. 157-160
Author(s):  
Shu Xing Xu ◽  
B. Wang ◽  
Yi Zhong Zheng
Keyword(s):  
Real Time ◽  
Virtual Instrument ◽  
Measurement Method ◽  
Low Cost ◽  
Measurement Theory ◽  
Water Film ◽  
Automatic Measurement ◽  
Time Data ◽  
Line Measurement ◽  
On Line

The thickness of water film is an important parameter in the field of chemical industry. Water film is formed by the flowing water, which flows through a narrow channel. So it is difficult to use contact gauges to measure the water film because it’s flowing so fast that if it is touched, the thickness will be changed. A low-cost and high precision non-contact measurement method—capacitive sensor is used as the sensor of the thickness of water film, virtual instrument is used to analyze the measurement state. In contrast to the conventional stand-alone instruments, a PC based virtual instrument for the measurement of water film is proposed in this paper. Based on on-line measurement theory, real time voltages should be collected to PC. These voltages will be computed by formulas in Labview and the real time data of thickness will be plotted on the screen. If bad signal got, it will give error alarm. The method of the measurement of water film can save a lot of fees of research and applications, and be easy to apply in other measurement and control fields. The basic principle and working process of capacitive micrometer, denoise method, the method of capacitive calibration, virtual instrument data acquisition system and on-line measurement of water film, will be further discussed in this paper.

Objective on-line assessment of marbling: a brief review

2004 ◽  
Vol 44 (7) ◽  
pp. 681 ◽  
Author(s):  
D. M. Ferguson
Keyword(s):  
Image Analysis ◽  
Measurement Accuracy ◽  
Subjective Evaluation ◽  
Bioelectrical Impedance ◽  
Visual Assessment ◽  
Objective Measurement ◽  
Video Image ◽  
Line Measurement ◽  
On Line ◽  
Visual Assessments

Visual assessment remains the preferred method for evaluation of marbling in abattoirs. However, visual assessments are compromised by the disadvantages inherent in most systems of subjective evaluation. To that end, several objective measurement technologies have been developed and evaluated for on-line measurement of marbling. Several of these technologies are reviewed in this paper. Of the current suite of technologies, video image analysis and the Danish bioelectrical impedance device offer the most promise in terms of measurement accuracy and suitability for on-line use.

Precision Focal Measuring System Based on CCD Aerial Cameras

2012 ◽  
Vol 571 ◽  
pp. 304-307
Author(s):  
Mei Zhao ◽  
Yu Fang Sha ◽  
Fei Guo ◽  
Ming Quan Yang
Keyword(s):  
Measuring Method ◽  
Image Resolution ◽  
Measuring System ◽  
Gravity Method ◽  
Line Measurement ◽  
Charge Coupled Devices ◽  
Exact Determination ◽  
On Line ◽  
Dynamic Scanning

In view of bigger error (0.24%) of conventional measuring method, this paper focuses on a bigger aperture aerial camera focus measuring system and discusses measuring principle and structure of the system. The image in this system is received by the collimator of long focus and area CCD (Charge Coupled Devices) camera. Using dynamic scanning and center of gravity method, the system measures effectively the location and size of the optimum image. The image resolution of CCD can be up to one tenth of the size of the photosensitive sensor and the precision of 0.1percent of focus measuring can be obtained. The problem of the larger error of conventional measuring method is salved fundamentally. The accurate, real-time and on-line measurement of the focus of aerial camera lens can be realized and the exact determination of the position of the surface can be determined.

INSPECTION OF COLOUR PRINTING QUALITY

1996 ◽  
Vol 10 (02) ◽  
pp. 115-128 ◽  
Author(s):  
CAJ SÖDERGÅRD ◽  
RAIMO LAUNONEN ◽  
JUUSO ÄIKÄS
Keyword(s):  
Machine Vision ◽  
Ccd Camera ◽  
Print Quality ◽  
Offset Printing ◽  
Printing Quality ◽  
Line Measurement ◽  
Target Values ◽  
Measurement Results ◽  
On Line ◽  
Grey Balance

The use of machine vision technology is being investigated at VTT for improving the colour quality and productivity of web offset printing. The visual inspection of colour quality is performed by a colour CCD camera which traverses the moving web under a stroboscopic light. The measuring locations and goal values for the colour register, the ink density and the grey balance are automatically determined from the PostScript™ description of the digital page. A set of criteria is used to find the most suitable spots for the measurements. In addition to providing data for on-line control, the page analysis estimates the zone wise link consumption of the printing plates as a basis for presetting the ink feed. Target calorimetric CIE-values for grey balance and critical colours are determined from the image originals. The on-line measurement results and their derivations from the target values are displayed in an integrated manner. The paper gives test results of computation times, measurements of register error with and without test targets and the colour measuring capabilities of the system. The results show that machine vision can be used for on-line inspection of colour print quality. This makes it possible to upgrade older printing presses to produce a colour quality that is competitive with more modern presses.

Research and Practice on the On-Line Measurement of Cylindricity Error in a Grinding Machine

2007 ◽  
Vol 359-360 ◽  
pp. 176-180 ◽  
Author(s):  
Lei Zhang ◽  
Ying Zhao ◽  
Lin Ba
Keyword(s):  
Measurement Accuracy ◽  
Measurement Instrument ◽  
Complete Separation ◽  
Error Measurement ◽  
Geometrical Error ◽  
Line Measurement ◽  
On Line ◽  
Grinding Machine ◽  
Cylindricity Error ◽  
Very High

This paper researches the theory of multi-probes EST (Error Separation Technique) further. The computer simulation on the three-probes EST is also carried out. Several contrastive experiments of the on-line measurement are carried out in a grinding machine (MB1332A). The workpieces used in the experiments had been measured by TALYROND 262 Geometrical Error Measurement Instrument. The results of these experiments successfully verify that the theory and mathematical models of this paper are correct. The contrast of the measuring results in these experiments proves that the three-probes method can realize the complete separation of all kinds of errors basically and this method is applicable to on-line measurement of a workpiece and it can also make the measurement accuracy very high.

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