Image processing method for automatic pointer-type instrument reading recognition

A technology of meter reading and automatic identification, applied in the field of image processing

Active Publication Date: 2015-03-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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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  • Image processing method for automatic pointer-type instrument reading recognition
  • Image processing method for automatic pointer-type instrument reading recognition
  • Image processing method for automatic pointer-type instrument reading recognition

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Embodiment Construction

[0044] 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.

[0045] Such as 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.

[0046] 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 o...

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Abstract

The invention discloses an image processing method for automatic pointer-type instrument reading recognition. The method comprises the following steps: (1) Hough circle detection is carried out on the image, a weighted average method is used for positioning the circle center and the radius of a dial, and a dial region square image is extracted; (2) the image is pre-treated, and a binary thinning image of the instrument pointer is extracted; (3) a central projection method is used for determining a pointer angle; (4) a zero graduation line and full graduation line position templates are extracted, and a range starting point and ending point positions are calibrated; (5) by using template matching, zero graduation line and full graduation line angles are obtained; and (6) according to the pointer angle, the zero graduation line angle and the full graduation line angle, the pointer reading is obtained through calculation. Thus, the problem that the instrument dial position on the acquired image is not fixed as the relative position between a camera and the pointer-type instrument is not fixed can be solved, subjective errors as the reading of the instrument is read manually can be eliminated, the efficiency and the precision can be improved, safety of people is ensured, the application range is wide, and robustness is strong.

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 Applications(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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