Reading recognition method of pointer meter based on machine vision

A technology of meter reading and recognition method, applied in character and pattern recognition, instruments, computer parts and other directions, can solve the problems of low real-time performance, low reading recognition accuracy, poor practicability, etc., and achieve good practicability. , high time complexity, strong real-time effect

Active Publication Date: 2019-01-01
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a machine vision-based pointer meter reading recognition method, thereby solving the probl

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  • Reading recognition method of pointer meter based on machine vision
  • Reading recognition method of pointer meter based on machine vision
  • Reading recognition method of pointer meter based on machine vision

Examples

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Example Embodiment

[0043] Example 1

[0044] Embodiment 1 of the present invention realizes the reading recognition of the pointer meter through the following steps:

[0045] Step (1): Use the LSD straight line detection algorithm for the image to be recognized, by detecting the sharp change of the image gray from black to white or from white to black, that is, by detecting the gradient value and gradient direction of each pixel in the image Straight line, the algorithm does not need parameter adjustment, it can quickly perform sub-pixel precision straight line detection in linear time, extract all straight line segments on the dashboard, avoid the use of Hough transform to detect straight lines that are prone to failure and high time complexity The problem.

[0046] Further, in Example 1, using the LSD line detection algorithm, 64% of the area in the middle of the image to be recognized, that is, the middle 0.8X*0.8Y area (such as figure 2 (a) is shown in the white box area), extract all the straigh...

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Abstract

The invention discloses a reading recognition method of a pointer-type meter based on machine vision, which comprises the following steps: extracting all straight lines of an instrument panel in an image to be recognized by using an LSD straight line detection algorithm; using length constraint and center constraint to filter out the non-pointer line segment to get pointer line; taking the lengthof pointer line and the distance between pointer line and the center point of circle as weighted values, the deflection angle of instrument pointer in the image to be recognized is obtained by linearweighting and taking the artificial virtual 0 DEG standard line as a reference; and the deflection angle of instrument pointer in the image to be recognized is obtained by linear weighting. The deflection angle of the instrument pointer in the template image is obtained by executing the steps for the template image, and the pointer-type instrument reading in the image to be recognized is obtainedby combining the known parameters of the template image. The method of the invention can realize the reading recognition of the pointer type instrument in the intelligent patrol inspection system of electric power, chemical industry, petroleum industry and the like, and has the advantages of good practicability, strong real-time performance and high accuracy rate of reading recognition of the pointer type instrument.

Description

technical field [0001] The invention belongs to the technical field of image processing and pattern recognition, and more particularly relates to a machine vision-based pointer meter reading recognition method. Background technique [0002] With the development of industrial automation, image processing and pattern recognition technology, for various types of pointer instruments widely used in electric power, petroleum, chemical and other industries, robot intelligent inspection is required to replace manual inspection and improve inspection efficiency. Reduce the risk and cost of manual inspections. [0003] For the reading recognition of pointer instruments, the existing method generally finds the pointer straight line segment through Hough (Hough) transformation, and then obtains the meter reading by calculating the angle of the pointer straight line segment. This method requires that the straight line segment of the pointer is long enough, otherwise it is easy to cause ...

Claims

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Application Information

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IPC IPC(8): G06K9/00
CPCG06V20/20G06V2201/02
Inventor 彭刚杜兵
Owner HUAZHONG UNIV OF SCI & TECH
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