[Feature Request] camera focus

[Erica-W]

Hi,
thanks for your great work!
when qrcode is small, can the camera auto focus be achieved?
Cheers

[raufozturk]

that's exactly what we need. On small QR Codes the scanning performace is very bad, 1cm x 1cm QR Size for example is very hard to scan, also maybe an option to enable the camera light on mobile phone will be helpful.

[nitin282001]

Hi there
I am also facing this issue of focusing the camera , my qr are small and camera is not focusing anyone got any solution for this ?
Anyone help me out of this 💯
Thanks in advance

[bcalik]

Is there any improvements on auto-focus?

[haimiko]

Hi there
I am also facing this issue of focusing the camera , my qr are small and camera is not focusing anyone got any solution for this ?
Anyone help me out of this 💯
Thanks in advance

Managed to fix this by increasing the aspect ratio to 2.

this.html5Qrcode.start(this.cameraId, {
      fps: 10,    // Optional frame per seconds for qr code scanning
      qrbox: undefined,  // Optional if you want bounded box UI, std 250, undefined disables
      aspectRatio: 2)
      
    },

[sjlongland]

aspectRatio seems counter-intuitive, aren't QR codes meant to be square (1:1 ratio)?

[haimiko]

it's the aspectRatio of the videostream which has the effect of enlarging/reducing the image.

[pstanton]

thanks @haimiko - aspectRatio: 2 definitely helps, now to figure out how to "mask" the top/bottom of the videostream. unfortunately aspectRatio: 3 breaks the UI entirely.

[pstanton]

qr-scanner works better

[mebjas]

This is a harder problem - one solution would be to add a QR code classifier and then another instance that zooms the camera stream to the given position if supported.

Aspect ratio will partially help but will also work upto a certain limit.

[mebjas]

Feature request for zoom feature: #330