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Number Recognition of Dot Matrix LED Display Using Morphological Processing and Template Matching  

Jung, Min Chul (Dept. of Electronic Engineering, Sangmyung University)
Publication Information
Journal of the Semiconductor & Display Technology / v.17, no.2, 2018 , pp. 41-46 More about this Journal
Abstract
This paper proposes a new method for the number recognition on dot matrix LED display. The proposed method uses morphological processing that dilates dots of numbers and connects the dots into strokes. The size of numbers is normalized using horizontal projection because the gaps of dots are different according to the size of numbers. The numbers are segmented by connected component analysis and finally, template matching method recognizes the segmented numbers. The proposed method is implemented using C language in Raspberry Pi system with a camera module for a real-time image processing. Experiments were conducted by using various dot matrix LED displays. The results show that the proposed method is successful for the number recognition on dot matrix LED display.
Keywords
Number Recognition; Dot Matrix LED; Morphological Process; Horizontal Projection; Template Matching;
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