A reading recognition method of a mechanical pointer pressure gauge

Abstract

The invention discloses a reading recognition method of a mechanical pointer pressure gauge. After image filtering and binarization processing, the center coordinates of the instrument dial are obtained through two times of Hough transformation. After the contour of the dial is extracted, the contour coordinate group is carried out. Polar coordinate transformation, and then take the center coordinates of the instrument dial as the center of the circle, perform scale search and recognition, obtain the dial scale area, and perform scale calibration in the scale recognition result area, obtain the calibrated two-dimensional vector about the angle and scale, and solve the scale recognition problem Convert to a two-dimensional vector to deal with the problem, and then construct a standard scale vector to calculate the distance between the two-dimensional recognition vector of the angle and the scale and the standard scale vector. At the minimum value of the distance between the two vectors, it is the start and end positions of the standard scale. And the pointer position is obtained by obtaining the minimum value of the average gray value of the inner ring of the scale ring; the advantage is to realize the automatic identification of the reading of the mechanical pointer pressure gauge and ensure the accuracy of the reading.

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...

Examples

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 range is...

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...

Examples

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 range is...

Images