The size of version $V$ is $N \times N$ with $N = 17 + 4V$. Each size is indexed by a version number, ranging from $1$ to $40$. Each symbol is a square array of smaller squares, which are called modules in the ISO manual. Another is that there are several options for QR code symbols, and some correspondingly complicated programming is involved. One reason is that it contains much necessarily technical information, and the symbols are organized for efficiency rather than elegance and simplicity. The exact definition of QR symbols is contained in an ISO/IEC manual of about 114 pages. In Japan, even now, these symbols are far more common than elsewhere in the world.
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The company has released the patent for free public use. QR symbols were first developed by the Japanese company DENSO, a subsidiary of Toyota, apparently in order to track manufactured items. How does your 'phone read the information in a QR code symbol? How is information stored on it? In this column I'll make a start, but really only a start, on answering these questions. As well as some of more doubtful taste, such as learning all about someone's dearly departed.
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Other applications include some very useful ones such as linking your phone to a real-time bus-schedule, paying for downtown parking, recalling where your car was parked, and how to purchase advertised items. In fact, this example is perhaps a bit out of date, since many phone apps nowadays will read the symbol and directly take you to a URL embedded in it.
If your mobile phone has a camera and the right app loaded into it, it can interpret one of these. The point is that these symbols are not meant to be read by the unaided human eye, but instead by a computer's aided eye. They are, however, still quite useful, as this store display from Bonn, Germany shows in a hopeful if unusual hand-painted message about a store for rent: it's February.) These do not exactly make much sense to the unaided human eye.
(The QR symbol on the left was an ad for the Canadian Liberal Party leaders' debate. QR code is what you find on those little black and white things that look like University of British Columbia, Vancouver, Canada How to Read QR Symbols Without Your Mobile Telephone How does your phone read the information in a QR code symbol? How is information stored on it? In this column I'll make a start, but really only a start, on answering these questions.
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