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An automatic reading method for a multi-dial pointer instrument

An automatic reading, pointer technology, applied in the direction of instruments, image data processing, character and pattern recognition, etc., can solve the problems of reading accuracy vulnerable to the working environment, poor robust performance, and heavy manual reading workload, saving images. The effect of collecting time and storage space, improving the accuracy of automatic reading, and improving the efficiency of image recognition

Active Publication Date: 2021-12-17
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pointer instruments require manual on-site value reading, but manual reading has a large workload, low efficiency, high error, and reading accuracy is susceptible to a series of uncertain factors such as the working environment, which can no longer meet the needs of modern industrial production.
Aiming at the problem of automatic reading of pointer instruments, researchers at home and abroad have proposed a series of algorithms including central projection method, subtraction method, template feature method, least square method, etc., among which central projection method, subtraction method, etc. The method and the template feature method are greatly affected by the image shooting environment, and their robustness is poor, while the least square method has a large amount of calculation and high error, and cannot be applied to the occasion of real-time reading. In addition, the above methods can only be used for pointer instruments. Reading on a single dial requires a lot of image acquisition and storage during the reading process, which is not only inefficient, but also requires a lot of manpower and material resources

Method used

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  • An automatic reading method for a multi-dial pointer instrument
  • An automatic reading method for a multi-dial pointer instrument
  • An automatic reading method for a multi-dial pointer instrument

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Embodiment Construction

[0052] In order to better understand the present invention, the technical scheme of the present invention will be further described below in conjunction with accompanying drawing:

[0053] Here we take the automatic reading of a pointer instrument with two dials on the left and right as an example to illustrate, let the dial on the right be dial 1, and the dial on the left be dial 2; figure 1 Shown, the present invention comprises the following steps:

[0054] A. Using the architecture of VS2012+OpenCV, establish the reference image of the two dials included in the pointer instrument F bi , i=1,2;

[0055] Reference image F bi The establishment includes the following steps:

[0056] A1. Adjust the pointers of the two dials in the pointer instrument to the zero scale position, such as figure 1 As shown, the camera is used to collect the image of the pointer instrument at this time and save it in JPEG format;

[0057] A2, carry out grayscale and binarization processing to t...

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Abstract

The invention discloses an automatic reading method for a multi-dial pointer meter, which includes establishing reference images F of N dials included in the pointer meter bi , establish the images to be tested F of the N dials included in the pointer instrument ti , the image to be tested F of the dial i ti with reference image F bi Perform position comparison and calculate the reading of dial i p These three steps; the present invention sorts and numbers the images of a plurality of dials, and then extracts ROI, opening operation, pointer refinement, Hough transform line detection and meter scale calculation for each dial respectively, and automatically obtains the information on the pointer meter. The indication value of each dial breaks the limitation that an image can only identify a single instrument, saves image acquisition time and storage space, thereby improving image recognition efficiency. At the same time, the present invention uses morphological operations to reduce noise on pointer area images And through the fast image thinning algorithm, the pointer area image is thinned, which greatly improves the automatic reading accuracy of the instrument.

Description

technical field [0001] The invention relates to the technical field of automatic monitoring systems for instruments and meters, in particular to an automatic reading method for multi-dial pointer instruments. Background technique [0002] Due to the characteristics of simple structure, convenient use and easy maintenance, pointer instruments are widely used in various industrial fields. However, pointer instruments need to be manually read on-site. However, manual reading has a large workload, low efficiency, high error, and a series of uncertainties such as the reading accuracy is vulnerable to the working environment, which can no longer meet the needs of modern industrial production. Aiming at the problem of automatic reading of pointer instruments, researchers at home and abroad have proposed a series of algorithms including central projection method, subtraction method, template feature method, least square method, etc., among which central projection method, subtractio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/32G06K9/40G06T5/00
CPCG06T5/002G06T2207/20036G06V10/25G06V10/30
Inventor 刘四军贺要锋孙明张红涛杨勇陶涛刘斌史雷敏李苏辉王玉兰李明凯
Owner STATE GRID CORP OF CHINA
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