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I have no iPhone 4 here now but I need to know how well is its camera for reading small-size QR codes. Now I have some test QR codes printed on a sheet of paper and my old 1.3MPx smartphone camera doesn't recognize them. So, I wonder how good is iPhone 5MPx camera for doing that. The code I need to be read well from a printed sheet is 16x16mm or so. The size of a single square module is about half of a millimeter now. Please let me know if you have a chance to test it or if you had a deal with such things. Thanks!

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Can you share that image? So we can test and tell you the result with the application we used. –  ARTniyet Jan 27 '11 at 10:15

2 Answers 2

16mmx16mm is pretty small (I tried with with my iPod Touch4G and it didn't work). I would say it would depends on the application which you are using and how well it does the image processing.

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Thanks. I suppose I need to make some experiments with this to find out the most compact yet readable size of QR code to use. –  Sergey Basharov Jan 27 '11 at 10:42
    
Yea.. Sadly, because of the different cameras that comes with the different iPhones, there won't be one limit which works for all.. –  notthetup Jan 27 '11 at 10:46

I use the RedLaser app on my iPhone 3GS and it can handle just about every QR code that I've thrown at it. I would venture to say it would work even better with the higher resolution camera and enhanced image processing in the iPhone 4. Good lighting is probably going to be key.

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