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Published 20 hours ago • verified publisher icon zxing-js

Set zoom/scale

Open kimdah3 opened this issue 5 years ago • 3 comments

Is your feature request related to a problem? Please describe. Trying to make the scanning more effective, I think by increasing the scale/zoom of the camera could make it better. I'm scanning really small data matrix codes which makes them hard to scan.

Describe the solution you'd like Ideally an attribute to set it up on the component. Is it possible to fork and change a setting of some sort?

kimdah3 avatar Mar 27 '19 11:03 kimdah3

i need the feature too

zhanglongchina avatar Nov 20 '19 00:11 zhanglongchina

Is it possible to fork and change a setting of some sort?

Teorically you can develop something over the existing code, but zooming without camera support isn't that simple:

  • It depends on the screen pixel density of the device for next items.
  • It depends on the scanner visible area so when the user zooms the image the scanner only tries to read user-visible area, so you need to crop and calculate area based on the component's visibility to make sense.
  • It depends on positioning the video correctly on the screen, considering portrait and landscape.

Cropping the video right is kinda hard. You can always try some native devices API like the torch (flashlight) API we use. Keep in mind that a PR will be welcome.

odahcam avatar Dec 05 '19 03:12 odahcam

I also need this feature. Someone have idea why i start to help this? I never develop using camera api.

Cristuker avatar May 31 '21 18:05 Cristuker