Scanning of big QR codes does not work in html5-qrcode, but works with ZXing demos

[StenGruener]

Describe the bug I cannot scan this big QR code: https://user-images.githubusercontent.com/25526781/53473345-76778700-3a6a-11e9-9ee4-2b72e19d691a.PNG

To Reproduce Scan.

Expected behavior I expect same output as with the ZXing demo: https://zxing-js.github.io/library/examples/multi-camera/

Screenshots If applicable, add screenshots to help explain your problem.

Smartphone (please complete the following information):

• OS: iOS
• Browser Safari
• Version 5.2

Additional context Will updating ZXing dependency help?

[ibalaji777]

facing same problem

[mebjas]

At a library level I can see that the underlying library is able to decode the QR Code.

One potential issue could be due to the QR box size which only covers a small portion of the viewfinder and thus to get the full qrcode you have to move a lot back and the QR code gets blurred due to filtering.

I'll check with an option for full size QR Scanning.

[StenGruener]

@mebjas ping, any updates here?

[angelocuartel]

I'm actually facing the same issue right now.

[StenGruener]

bump

[StenGruener]

@mebjas ping, we are facing a bad-blocker by this issue any idea how to adjust viewfinder?

[mebjas]

I was able to reproduce this well - the shared QR code couldn't get decoded with file based scanning either.

One idea that come to mind is by using a larger hidden canvas, I'll try that.

[mebjas]

I can verify that the zxing demo is able to scan the code, investigating further.

[noelho]

I just tried this and I managed to scan the QR code, however, I had to set my QRBox to at least 500px.

I was also having trouble scanning large sized QR codes, but it looks like increasing the QR box size resolves this issue. However, the downside is my capture screen becomes larger and larger.

I assume this has to do with the resolution of the image making it easier for the QR code to be decoded?

[StenGruener]

Ping and bump

[mbrotos]

Still an issue