Direct vs. Indirect 2D Barcodes

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In Japan, where the QR code originated, indirect codes are not used. So, what are the differences between direct and indirect 2D scan codes? Direct: The data is embedded within the code.After scanning a direct code, it is decoded by software on the mobile device, which sends the extracted URL to the mobile device browser as if it had been keyed in. Scan code > decode > arrive at final URL.Direct codes are typically larger than indirect codes because the data is contained in the code itself. For example, take a 2D scan code that has been encoded with contact information—when it is scanned with a scanner app, the user is prompted and given the option of storing the contact information in their contacts list. In the example just given, an Internet connection is not required. If, however, the 2D scan code has been encoded with a URL and the user wanted to link to it on their smartphone, an Internet connection would be necessary. Some other examples where an Internet connection would not be necessary include storing a calendar event, contact information (vCard), email address, geo location, phone number, SMS or text.Indirect: The data resides on a server, and is not embedded within the code.By contrast, indirect codes are encoded with a short text string called an identifier; an index, if you will, to a database containing information about the code. Scan code > decode > intermediate URL > reference index > arrive at final URL.Like direct codes, software running on the mobile device decodes the code. But here the software creates a URL to a web address specified in the application containing the index and passes it on to the final destination. Indirect encoding is proprietary and most likely requires proprietary software to create a code and a proprietary scanner to decode it. It is often stated that an indirect code is more secure and will also result in a smaller code. In Japan, where the QR code originated, indirect codes are not used. With regards to security, both direct and indirect codes can be “switched” or “code jacked.” On the subject of size, direct codes can be simplified by shortening the string to begin with or by using some type of URL shortener. Chris Lehan is the Director of Product Development at Impressions Incorporated (a multi-color printer in St. Paul, MN specializing in the complete production of customized printing and paperboard packaging). http://www.i-i.com/Follow me on Twitter @chrislehan