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An Image Processing Method for Automatic Recognition of Pointer Meter Readings

A technology of instrument reading and automatic identification, applied in the field of image processing, to achieve the effect of improving efficiency and accuracy, wide application range, and expanding the scope of application

Active Publication Date: 2017-11-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide an image processing method for automatic recognition of pointer meter readings. This method can still realize the accuracy of pointer meter readings when the positions of the camera and the meter dial are not fixed and the imaging quality of the camera is not high. Automatic recognition with high recognition accuracy

Method used

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  • An Image Processing Method for Automatic Recognition of Pointer Meter Readings
  • An Image Processing Method for Automatic Recognition of Pointer Meter Readings
  • An Image Processing Method for Automatic Recognition of Pointer Meter Readings

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Embodiment Construction

[0052] An image processing method for automatic recognition of pointer meter readings proposed by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] like figure 1 As shown in Fig. 1, the original image of the instrument panel that needs to be read is collected and stored by the camera whose position relative to the pointer instrument is not fixed.

[0054] Then extract the dial area, such as figure 2 As shown, Hough circle detection is performed on the original image to extract multiple sets of circle center coordinates and corresponding radius values. The abscissa, ordinate and radius of the center of the circle are weighted and averaged to obtain their respective mean values, and the threshold value is set to eliminate the center coordinates and radius of the circle with a large deviation from the mean value. The weighted average of the retained center coordinates and corresponding radii is performed again to ob...

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Abstract

An image processing method for automatic recognition of pointer instrument readings disclosed by the present invention, the implementation steps are as follows: (1) Hough circle detection is performed on the image, the center and radius of the dial are located using the weighted average method, and a square image of the dial area is extracted; (2) Image preprocessing, extracting the binary value of the instrument pointer to refine the image; (3) Use the center projection method to determine the pointer angle; (4) Extract the zero scale line, full scale line position template, and calibrate the starting point and end position of the range; (5) Use the template Match to get the angle of zero scale line and full scale line; (6) Calculate the pointer reading according to the pointer angle, zero scale line angle and full scale line angle. The invention solves the problem that the relative position of the camera and the pointer meter is not fixed, which leads to the problem that the position of the meter dial on the collected image is not fixed, not only can eliminate the subjective error caused by manual reading of the meter reading, but also can improve the efficiency and accuracy , Guarantee the safety of personnel, wide application range and strong robustness.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an image processing method for automatically recognizing pointer instrument readings. Background technique [0002] In testing technology, due to its simple structure and convenient use, the pointer instrument is widely used in electric power, petroleum, chemical industry and other industries. In some test sites, such as outdoors that are not easy to observe or places that are harmful to personnel, it is difficult and dangerous to manually read the meter readings. Using image processing technology for high-precision automatic recognition of pointer meter readings can not only eliminate subjective errors caused by manual reading of meter readings, but also improve efficiency and accuracy and ensure personnel safety. [0003] Use image processing technology to carry out high-precision automatic recognition of pointer instrument readings. Firstly, the original image of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00
CPCG06V20/20G06V10/22
Inventor 闫钧华杭谊青段贺姜惠华王志刚王顺飞朱可许俊峰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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