Na LI, Jun WANG, Xing-fa DONG, et al. Pointer meter recognition method based on improved hough transform[J/OL]. Chinese journal of liquid crystals and displays, 2021, 1-8.
DOI:
Na LI, Jun WANG, Xing-fa DONG, et al. Pointer meter recognition method based on improved hough transform[J/OL]. Chinese journal of liquid crystals and displays, 2021, 1-8. DOI: 10.37188/CJLCD.2020-179.
Pointer meter recognition method based on improved hough transform
In order to solve the problems of uneven illumination and low accuracy in the automatic recognition system of pointer instruments, an Otsu algorithm and an improved Hough algorithm are proposed to process the instrument image. Firstly, the instrument image is preprocessed to enhance the characteristics of the instrument pointer area, Otsu algorithm perform image binarization to segment pixels that only belong to the pointer, and perform improved Hough transform to detect the pointer. By quickly extracting the center pixel point of the dial pointer's connected area, combined with the dial center constraint, double threshold Hough is performed on the extracted pixel point Transform straight line detection. Experiments show that the proposed algorithm detects the meter reading error at about 4.76%, which meets the system accuracy requirements.
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