Re: Reverse scanned QR code failing

[Sean Owen]

Mirror images of QR codes are not valid, if that's what you mean. You would have to correct this image by flipping it over.

You could also flip the image over and re-scan in the cases where it fails.

If you mean simply rotated 180 degrees, that's fine. It should detect it at pretty much the same rate.

[Rana]

Thanks Sean. Really Appreciated.

 

Yes when we rotated image 180 degrees using JAI apis and decoded again with ZXing...It worked.

[Sean Owen]

Hmm that's odd since a simple rotation shouldn't cause much scanning problem. Still, if it is a problem, that is indeed the simple solution to rotate and scan again. (You can use AWT APIs for this, note, you don't have to use old JAI stuff.)