#1 Limited size?

[Pedro Lopes]

Hi,

I am using the library, but I cant decode an image (QRCode)with more 200 bytes.

The usual in a QRCode model 2 would be aprox. 4000 bytes alphanumeric right?

Images with less 200 bytes, I can see the result perfectly.

My source:

// -------------------------------------------------------
ui->setupUi(this);
QString result = "";
QZXing *imgDecoded = new QZXing();
imgDecoded->setDecoder(QZXing::DecoderFormat_QR_CODE);

QImage img = new QImage("C:/Users/Pedro/Desktop/QRSafeGenerator/images/qrcode.png");
result = imgDecoded->decodeImage(img);
ui->result->setText(result);
ui->image->setPixmap(QPixmap::fromImage(*img));
// -------------------------------------------------------

I added my image in attach.

Regards,
Pedro

[Nikolaos Ftylitakis]

Hello Pedro,

there is no restricition of the bytes that the QR code contains, though i have seen failures when it is needed to decode images with high resolution.

The image that you have attached is 1000x1000. I have successfully decoded it by down-scaling it to 512x512 for instance. This can be easily done by replacing the following line of your code:
result = imgDecoded->decodeImage(img);
to:
result = imgDecoded->decodeImage(img, 512, 512, true);

The reason of this "restriction" or the threshold over which failures begin to occur are still unclear to me, though i will try to investigate it when possible.

Please do try the above suggestion and reply the result so as to close the ticket if everything goes well.

Best regards.

[Nikolaos Ftylitakis]

The maximum acceptable resolution is 999x999.
Investigation will take place to locate the bottleneck.

[Pedro Lopes]

Hello Nikolaos,

Thanks for the investigation.
I tried as you said and works fine!

You can close the ticket please.