Talk:QR code

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High traffic

On 2 June 2010, QR code was linked from Slashdot, a high-traffic website. (See visitor traffic)

Risks from malicious QR codes[edit]

I hope my entry tonight regarding risk was more appropriate to Wikipedia than before. If you can improve it, please do so. Risks associated w/ QR Codes are far more than just dangerous URLs (which are well known and have their own many different Wiki pages, such as Webpage_hijacking and Cross-site_scripting). They can be as dangerous as the many forms of Computer_virus. But QR Code risks are unique in their own right and possibly greater than these given their easy creation and distribution, their complexity/obscurity to humans, the readiness of smartphone users to scan it, and the immense number of good (and bad) things that little bit of code can do to a computer. For actual results read https://appsec-labs.com/blog/tag/qrcode/ Supposedly, Blackhat 2011 had a Skytalk, an unannounced and anonymous Black_Hat_Briefings, where a research group posted a QR Code on the back of bathroom stall doors which when scanned opened an innocent webpage but also turned on the camera and streamed its video to a webserver until the battery died or memory was corrupted. There might also be QR Code risks that could break a Reader just like malicious webpages can break out of a browser.... but until those details appear in a more public forum they'll remain mere speculation and thus hide out here on the discussion page. — Preceding unsigned comment added by Sweerek (talkcontribs) 02:33, 1 September 2011‎ (UTC)

I've added a very brief introduction, since that section is a bit misleading in making it appear as if the QR codes themselves would do the harm, when they really can only send data to the applications associated with the particular data type, like the browser, which may then allow exploiting a flaw in that application. In short: I want to make it clear that these issues are due to faulty implementations, not by design. — Preceding unsigned comment added by Hansschmucker (talkcontribs) 10:29, 17 October 2013 (UTC)

Add to article a table of character-capacities![edit]

See http://www.thonky.com/qr-code-tutorial/character-capacities/ — Preceding unsigned comment added by 189.35.184.111 (talk) 04:38, 2 August 2013 (UTC)

Unclear description of image[edit]

In http://en.wikipedia.org/wiki/File:QR_Character_Placement.svg there is mentioned, that dark would be 0 on even rows and 1 on odd rows. Where does this information come from? I read a lot in ISO/IEC 18004:2006(E), but I could not figure out anything about a different encoding on even or odd rows? I think this should get a reference or be deleted. — Preceding unsigned comment added by 176.198.137.139 (talk) 19:15, 12 August 2013 (UTC)

The encoding algorithm has a masking step; one of several XOR masks are chosen to minimize unwanted patterns in the data pixels. From the .svg description, the selected mask is one that inverts the even rows. Glrx (talk) 19:42, 12 August 2013 (UTC)

add an History section[edit]

"Invention" section is incomplete. Example of "History" content, that can be compressed: http://www.qrcode.com/en/history/ — Preceding unsigned comment added by 179.208.229.37 (talk) 14:10, 14 September 2013 (UTC)

Bad description in last two "sample" QR codes[edit]

I'm not enough of an expert to know what's wrong, but the last two QR codes in the samples are not properly described - they are both "Version 40 (177×177)" when the one on the right is obviously more data than the one on the left - for example, one is 5 "alignment blocks" wide while the other is 7 "alignment blocks". — Preceding unsigned comment added by Pxtl (talkcontribs) 17:40, 8 November 2013 (UTC)

Yes, first does not look like a V.40, but I don't have the spec available right now. Glrx (talk) 23:02, 9 November 2013 (UTC)

Software?[edit]

Is a software needed? Which device can run that software? The article don't tell very much about this. --109.53.213.118 (talk) 08:39, 23 January 2014 (UTC)

I'm not entirely sure what you're asking. Yes, software is used in both creating and reading QR codes, which is run on a large variety of devices. This seems clear enough to me, from the article. /ninly(talk) 14:08, 15 April 2014 (UTC)

I came here for a simple description of how I can read QR code with my smartphone. No easy way to find it from here. Maybe it's embedded somewhere in the article filled with lots of technical details but of course, I don't have time for that. — Preceding unsigned comment added by 130.154.0.250 (talkcontribs) 17:36, 27 October 2014

Possibly a hidden Ad Campaign?[edit]

Note that reference 50 leads to http://vitreoqr.com/2014/QR_Code.html a company that CLEARLY is selling QR Codes. We should also note that everyone CAN download the iQR generator from Denso-Wave's website after registering (free): http://www.denso-wave.com/en/adcd/product/software/building/qrdraw-ad.html IMHO, this reference should be changed or removed. I'd put this as the reference instead: http://www.qrcode.com/en/codes/iqr.html — Preceding unsigned comment added by 188.250.154.18 (talkcontribs) 16:32, 4 July 2014