On October 31, we held our biggest annual event of the year, the MATLAB EXPO 2017 Japan. This year, I took part in organizing a couple of new sessions: a Lightning Talk session around fun/hobby uses of MATLAB, and a MATLAB Coding Contest.
As part of these sessions, I wanted to make use of the QR code (which encoded the registration ID number) that each attendee was given. For the lightning talk, I needed to quickly capture the IDs of the audience to do a drawing at the end for prizes. For the coding contest, I needed a way to capture the IDs of the players to keep score.
This is what the EXPO participants had hanging around their necks.
im = imread('qr_example.jpg'); imshow(im)
Rather than try to detect and do OCR on the ID number, I figured it would be easier to try to read the QR code. So, how do I read a QR code? Well, my colleague, Takeyoshi, took on the challenge to do that. After searching the web to find the encoding/decoding specs, he put together a nice function that used Lior’s entry on the File Exchange. The entry is a wrapper around a Java library ZXing, and we were pleasantly surprised at the accuracy it gave.
% Add java path javaaddpath('core-3.3.0.jar') javaaddpath('javase-3.3.0.jar') str = decode_qr(im)
str = '10007'
With a little bit of modification, I was able to create an ID Scanner for the purpose of the EXPO sessions.
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