Mechanical pointer pressure gauge reading identification method

A recognition method and pressure gauge technology, applied in character and pattern recognition, computer parts, instruments, etc., can solve problems such as difficult to guarantee the accuracy of readings

A recognition method and pressure gauge technology, applied in character and pattern recognition, computer parts, instruments, etc., can solve problems such as difficult to guarantee the accuracy of readings

CN110378326AActive Publication Date: 2019-10-25河南博锐流体设备有限公司
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  • Mechanical pointer pressure gauge reading identification method
  • Mechanical pointer pressure gauge reading identification method
  • Mechanical pointer pressure gauge reading identification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0095] Embodiment: a kind of mechanical pointer pressure gauge reading recognition method, comprises the following steps:

[0096] (1) Take the original color image of the mechanical pointer pressure gauge through the camera;

[0097] (2) Obtain the dial image of the mechanical pointer pressure gauge from the original color image, the specific process is:

[0098] 2.1 Grayscale the original color image to obtain the initial grayscale image;

[0099] 2.2 Perform Gaussian filtering and median filtering sequentially on the initial grayscale image to obtain an intermediate grayscale image;

[0100] 2.3 Construct a two-dimensional coordinate system, and place the intermediate grayscale image in the two-dimensional coordinate system;

[0101] 2.4 Set the input parameter range of the Hough transform to F H‘’ *f H‘’ *1.1-F H‘’ *f H‘’ *0.90, where F H‘’ The value is the width resolution of the image captured by the camera, that is, the number of width pixels, f H‘’ The value ra...

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Abstract

The invention discloses a mechanical pointer pressure gauge reading identification method. The method comprises steps of carrying out image filtering and binarization processing; through two times ofHough transformation, acquiring an accurate instrument dial center coordinate. After dial contour extraction, carrying out polar coordinate transformation on the contour coordinate group; taking the center coordinate of the instrument dial as a circle center; carrying out scale search recognition, obtaining dial scale area, carrying out scale calibration in a scale identification result area; obtaining a calibrated two-dimensional vector about the angle and the scale; converting a scale identification problem into a two-dimensional vector processing problem; constructing a standard scale vector, calculating the distance between the two-dimensional identification vector of the angle and the scale and the standard scale vector, taking the minimum value of the distance between the two vectorsas the starting and ending positions of the standard scale, and solving the position of the pointer by adopting a method of solving the minimum value of the gray average value of the circular ring inthe scale ring. The method has the advantages that the mechanical pointer pressure gauge reading is automatically identified, and the reading accuracy is ensured.

Description

technical field [0001] The invention relates to a reading recognition method of a pressure gauge, in particular to a reading recognition method of a mechanical pointer pressure gauge. Background technique [0002] The mechanical pointer pressure gauge based on Bourdon tube is mainly used to measure the gauge pressure from 0.06 to 700MPa. This mechanical pointer pressure gauge indicates pressure by converting the elastic deformation of the Bourdon tube into rotational motion, causing the pointer to deflect. The mechanical pointer pressure gauge has the advantages of simple structure, high fatigue strength, low cost and no power supply when working, and has been widely used in industrial production and life. [0003] At present, after the pressure is added to the mechanical pointer pressure gauge, the readings displayed on the dial are all recognized by the naked eyes of the staff, and the accuracy of the readings is difficult to guarantee. Contents of the invention [000...

Claims

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Application Information

Patent Timeline
25 Oct 2019
Publication
CN110378326A
IPC
G06K9/20; G06K9/00; G06K9/32; G06K9/60
CPC
G06V20/10; G06V10/22; G06V10/25; G06V10/20
Inventors
陈龙; 吴振谦