Projection method based on MATLAB electric meter dial reading recognition
The meter dial is an important device for measuring electrical energy consumption. However, when reading the meter, the numbers and scale lines on the dial may be blurred or reflective, which affects the accuracy of the reading. In order to solve this problem, computer vision technology and MATLAB programming can be used to realize automatic recognition of meter dial readings. This article will introduce a method for identifying electric meter dial readings based on the projection method, and provide the corresponding MATLAB source code.
1. Method principle
Projection method is a commonly used image processing method, which can be used to extract contour information in images. In the recognition of electric meter dial readings, the projection method can be used to extract the outline of the numbers on the dial, and then obtain the position and shape information of the numbers, so as to realize the reading recognition.
Specific steps are as follows:
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Image preprocessing: After reading the meter image, preprocessing is performed first. You can use the image processing functions in MATLAB to perform operations such as grayscale and binarization on the image to improve the effect of subsequent processing.
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Edge detection: Use MATLAB's edge detection function, such as the Canny operator, to perform edge detection on the preprocessed image. This step can help extract the outline information of the numbers.
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Projection extraction: Based on edge detection, using the projection function of MATLAB, the digital contour information can be projected into the horizontal and vertical directions to obtain a one-dimensional projection histogram. By analyzing the projection histogram, the position and shape information of the numbers can be obtained.
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Digital recognition: Based on the position and shape information of the numbers, the digital areas can be segmented from the image and further processed and recognized. You can use MATLAB's image processing functions, such as connected area analysis, character recognition, etc., to realize digital recognition.
2. MATLAB source code implementation
The following is a simple MATLAB code example that demonstrates how to realize the recognition of electric meter dial readings based on the projection method. Please note that this is only a sample code, with