Pointer type instrument automatic reading method based on scale search

Abstract

The invention discloses a pointer type instrument automatic reading method based on scale search, which comprises the following steps: preprocessing an instrument image to obtain an instrument regionbinary image, performing probabilistic Hough transform on the instrument region binary image, and identifying an instrument pointer; performing instrument scale search by utilizing the virtual searchbox; carrying out connected domain detection on the binary image of the instrument area to determine a candidate digital area and identifying scale values in the candidate digital area a based on a convolutional neural network; respectively calculating the distance between the center of each scale value and the starting point of all the scale marks, distributing each scale value to the scale withthe shortest distance, and determining the scale value of the scale without the marked numerical value according to the relation of the scale marks; and determining the instrument reading according tothe distance relationship between the pointer and the two scales closest to the pointer. According to the invention, scale value identification and scale value calculation algorithms are provided, sothat prior information in a database is not needed.

Description

technical field [0001] The invention belongs to the technical field of pattern recognition, in particular to an automatic reading method of a pointer instrument based on scale search. Background technique [0002] In the indoor power distribution room, there are many instruments that can display the status of the equipment and systems of the electric cabinet. Most of these meters are pointer meters, and the reason for this is that they are highly resistant to electromagnetic interference, simple in structure and low in maintenance cost, but they do not have any digital interface, and their readings are usually read manually, This is time consuming and inconvenient. Additionally, human error is likely to occur due to issues such as viewing angles and eye fatigue, making manual readings unreliable. Therefore, it is of great importance to find a more accurate, robust and repeatable way to read the readings of analog meters. [0003] In order to avoid manual reading and impro...

AI Technical Summary

Problems solved by technology

Most of these methods can be applied to read tasks to some extent, but their shortcomings are also obvious

Most algorithms can only be used in meters with uniform scale, which limits their application to non-uniform scale meters

In addition, they need to find the center point of the meter, so they cannot read the square meter with the center point hidden behind the dial, and the error of the meter center point recognition will affect the accuracy of the algorithm

Finally, many algorithms require a priori information, such as the location of the lower and upper scales, etc., making it inconvenient to read

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