Pointer type instrument reading method based on machine vision

Abstract

The invention relates to a pointer type pressure instrument reading method based on machine vision. The pointer type pressure instrument reading method comprises the following steps of obtaining an instrument standard template image and an instrument image to be read; matching the to-be-read instrument image with the instrument standard template image by using a matching algorithm to obtain a corrected to-be-read instrument image; denoising the corrected to-be-read instrument image, performing threshold segmentation on the denoised corrected to-be-read instrument image to obtain a background-removed to-be-read instrument image, and positioning the position of a boundary circle of a dial plate in the background-removed to-be-read instrument image; performing expansion operation on the background-removed instrument image to be read to obtain a pointer image; obtaining a needle point coordinate (x1, y1) and a circle center coordinate (x2, y2) in the pointer image; and obtaining the angular position of the pointer according to the tip coordinates (x1, y1) and the center coordinates (x2, y2), and obtaining the reading of the instrument according to the angular position of the pointer. Compared with the prior art, the method is advantaged in that reading of an instrument is more accurate.

Description

technical field [0001] The invention relates to the field of image monitoring and processing systems, in particular to a method for reading pointer meters based on machine vision. Background technique [0002] In the factory verification process of the pointer pressure gauge, it is necessary to verify and adjust the reading error of the gauge. At present, the pressurization of the instrument is mainly carried out manually, the current reading of the instrument is read out through human eye observation, and the error of the instrument under test is calculated by comparing the value of the high-precision digital instrument. The factory verification of the pointer pressure gauge by this manual method is inefficient and not high in accuracy, especially for long-term continuous interpretation, it is easy to cause visual fatigue, resulting in errors. In addition, the instrument was not screwed in place during the fixed installation, and the camera used to collect the image of the...

AI Technical Summary

Problems solved by technology

The factory verification of the pointer pressure gauge by this manual method is low in efficiency and low in accuracy, especially for long-term continuous interpretation, it is easy to cause visual fatigue, resulting in errors

In addition, the instrument was not screwed in place during the fixed installation, and the camera used to collect the image of the instrument was not facing the instrument, resulting in the acquisition camera being unable to accurately capture the image of the instrument panel, and the collected instrument image would have a certain attitude error

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