Automatic recognition method of pointer instrument reading based on scale search

Abstract

The invention discloses an automatic identification method for readings of pointer instruments based on scale search. The present invention is an automatic identification method of pointer meter reading based on scale search, comprising: S1: acquiring the image of the pointer meter dial containing the reading to be recognized; S2: using the trained target detection network to detect the image in S1 , to obtain the vertex coordinates of the instrument dial area, and extract the area as the dial image, and scale it to a uniform size; S3: perform preprocessing operations such as grayscale, image filtering, detail enhancement, and binarization on the dial image, and obtain only the foreground and A binarized image of the dial for the background. Beneficial effects of the present invention: (1) The method for identifying the readings of pointer instruments based on scale search can be applied not only to instruments with uniform scales, but also to instruments with non-uniform scales. The method has stronger adaptability and wider application range.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an automatic identification method for pointer instrument readings based on scale search. Background technique [0002] Various monitoring instruments widely exist in modern industrial production. They indicate the status of each link in the production and play an indispensable role in ensuring the orderly and efficient production. At present, there are two common types of instruments: pointer instruments and digital instruments. Pointer instruments are widely used in fields such as mines, oil production, electric power, metering, and military industry due to their characteristics of anti-electromagnetic interference, anti-seismic, and oil pollution resistance. In addition, due to reasons such as antifreeze, waterproof, and low price, there are still a large number of pointer instruments in the fields of manufacturing, energy and chemical industry. [0003] In order to monitor an...

AI Technical Summary

Problems solved by technology

This will bring about the following problems: first, the way it calculates the reading determines that it can only be used for instruments with uniform scales, and it is not suitable for instruments with non-uniform scales; Applicable; third, a large amount of prior knowledge needs to be manually provided, such as the position of the zero scale line, the maximum range, the angle corresponding to the maximum range, etc., and some templates need to be prepared in advance, which is cumbersome to deploy and requires a lot of work

Disadvantages: The dial to be processed is single, and the method of ellipse fitting makes it unable to process a square dial; there are requirements for the dial scale (wide scale)

Disadvantages: It is necessary to make templates in advance and inform the maximum and minimum ranges in advance, and the workload is large; the calculation of instrument readings by the angle method makes it impossible to use for instruments with non-uniform scales

Disadvantages: It cannot be applied to pointer instruments such as square dials whose rotation center is not in the center of the dial; for dials with non-uniform scales, this method will cause large reading errors

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