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7-Segment Optical Character Recognition Using Template Matching  

Jung, Min Chul (Dept. of Electronic Engineering, Sangmyung University)
Publication Information
Journal of the Semiconductor & Display Technology / v.19, no.4, 2020 , pp. 130-134 More about this Journal
Abstract
This paper proposes a new method for the digit recognition on a 7-segment display. The proposed method uses morphological processing that dilates segments of digits and connects them into strokes. The digits are extracted by connected component analysis and finally, template matching method recognizes the extracted digits. The proposed method is implemented using C language in Raspberry Pi 4 system with a camera module for a real-time image processing. Experiments were conducted by using various 7-segment LED displays and 7-segment mono LCD displays. The results show that the proposed method is successful for the digit recognition on the 7-segment displays.
Keywords
Digit Recognition; 7-segment Display; Morphological Process; Size Normalization; Template Matching;
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