Classroom fingerprint check-in system based on template matching technology - with Matlab source code
The classroom fingerprint check-in system is a common way of checking attendance. In actual use, how to quickly and accurately perform fingerprint identification is an important issue. This article will introduce a classroom fingerprint check-in system based on template matching technology, and provide the relevant Matlab source code.
1. The process of classroom fingerprint check-in system
The basic flow of the system is as follows:
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The mobile app establishes a connection with the server;
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Students enter fingerprint information on the fingerprint collection device;
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Verify whether the fingerprint information is legal;
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Send fingerprint information to the server;
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The server verifies the fingerprint information and compares the similarity with the registered fingerprint information in the database;
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If the similarity reaches a certain threshold, it is judged that the student has arrived, and the attendance information is recorded;
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Return the result to the mobile app.
2. Fingerprint recognition algorithm based on template matching technology
Template matching technology is a pixel-level image processing technology that can be used to find the position of a small image in a large image. In fingerprint recognition, there are two commonly used template matching algorithms, SSD (Sum of Squared Differences) and NCC (Normalized Cross Correlation).
The following is an example of Matlab code implementing the SSD algorithm:
function [result, x, y] = fingerprint_match_SSD(input_img, template_img)
% 输入参数：input_img为输入图像，template_img为模板图像
% 输出参数：result为匹配结果，x和y为匹配位置的坐标
input_gray = rgb2gray