Unable to scan QRCode via zxing client

Question

I am unable to scan a QR Code having dark background(dark pink) with lighter QRcode(light pink) on it. I have integrated the zxing barcode scanner in my application to scan codes.. It works perfect for lighter background and dark QRcodes.

I tried this using the default zxing barcode scanner application. But it could not scan such kind of codes.

Following is the QRCode I am trying to scan,

Please suggest some solution.

Thankyou.

Answer 1

Contrast of QR Code you included should be enough for most cameras. Problem here is that the ZXing library does not support inverted QR Codes. It only supports dark codes on light background.

To add this support, you need to invert the image yourself. You can use some code similar to this one: http://www.androidsnippets.com/how-to-invert-bitmap-color

Of course, you will need to integrate the ZXing by including the library to accomplish this, not just by Intent (I don't know how you're doing it now) so you can modify some code.

You can add the code to invert the bitmap in the method decode(byte[], int, int) of class DecodeHandler.