Pointer type pressure gauge automatic calibrator indicating value reading method based on machine vision

A technology for indication readings and pressure gauges, which is applied to the measurement of fluid pressure, calibration/testing of force/torque/power measuring instruments, instruments, etc., and can solve cumbersome manual calculations, heavy tasks for testers, and inconsistent visual errors in manual readings And other issues

Pending Publication Date: 2020-11-03
CHINA JILIANG UNIV
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Problems solved by technology

In the case of a large number of on-site pressure gauges, manual calibration of pressure gauges is not only inefficient, but also the testers have extremely heavy tasks. Moreover, due to the individual differences of each tester, the visual errors of manual readings are inconsistent, and the manual calculation of errors is cumbersome. Error-prone, resulting in a low accuracy rate of the calibration report, which seriously affects the scientificity and rigor of the measurement work

Method used

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  • Pointer type pressure gauge automatic calibrator indicating value reading method based on machine vision
  • Pointer type pressure gauge automatic calibrator indicating value reading method based on machine vision
  • Pointer type pressure gauge automatic calibrator indicating value reading method based on machine vision

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Embodiment Construction

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. In the image of the pressure gauge in this embodiment, the actual size of the dial is 150 mm in outer diameter, and the range of the pressure gauge is 2.5 MPa.

[0017] (1) Firstly, grayscale operation is performed on the collected pressure gauge image, and then noise reduction processing is performed on it. In this embodiment, adaptive median filtering is used to complete the image filtering process. The specific process is as follows:

[0018] Define a rectangular window S of m×n xy as a filter area. Define the following variables in this area: Z min is S xy The minimum gray value in Z, Z max is S xy The maximum gray value in Z med is S xy Medium gray average, Z xy is the gray value at coordinates (x, y), S MAX is S xy The maximum size allowed. The adaptive median ...

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Abstract

The invention discloses a pointer type pressure gauge automatic calibrator indicating value reading method based on machine vision. According to the method, the current latest image processing technology is used, mathematical knowledge such as the least square method is combined, and automatic interpretation of the pressure gauge indication value in the pressure gauge automatic calibration instrument is achieved. According to the method, system errors caused by different experiences of testers, inconsistent visual errors and the like due to manual interpretation are reduced, so that the rapidity and accuracy of pointer type pressure gauge verification are improved.

Description

technical field [0001] The invention belongs to the technical field of machine vision, and mainly relates to a machine vision-based method for indicating and reading an automatic calibrator of a pointer pressure gauge. Background technique [0002] The use of pointer pressure gauges is very common and there are a large number of them. However, the calibration of pressure gauges still mainly adopts the traditional manual pressure adjustment and human eye reading methods. In the case of a large number of on-site pressure gauges, manual calibration of pressure gauges is not only inefficient, but also the testers have extremely heavy tasks. Moreover, due to the individual differences of each tester, the visual errors of manual readings are inconsistent, and the manual calculation of errors is cumbersome. It is prone to errors, resulting in a low accuracy rate of the calibration report, which seriously affects the scientificity and rigor of the measurement work. In order to auto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13G06T7/66G06T5/00G06K9/38G01L25/00G01L27/00
CPCG06T7/13G06T7/66G06T5/002G01L25/00G01L27/002G06T2207/20032G06T2207/10004G06V10/28G06V2201/02
Inventor 张斌何仁杰林子祥
Owner CHINA JILIANG UNIV
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