Reduce scanning area

[gsharmaappcore]

I need to reduce the scanning area so that the barcode when placed in the center of the red scan line then only it should be scanned.Please provide the way out for this

[paulc8712]

This would be great as the user expects that the scan will occur when in the 'target area', and it can get confusing when a scan is triggered outside of that.

[kiwicodemonkey]

Can this please be looked at? As paulc8712 said, it is very confusing for users when the scan does not occur where they expect.

For our case, we are only interested in this for 1D barcodes. Looking through the source, there a method:

MultiFormatOneDReader.decodeRow(int rowNumber, BitArray row, Map<DecodeHintType,?> hints)
Attempts to decode a one-dimensional barcode format given a single row of an image.

Could we have an option to call this against the center line of the image?

[huytran291195]

I need to reduce the scanning area so that the barcode when placed in the center of the red scan line then only it should be scanned.Please provide the way out for this

Can you solve it yet? .. Help me. I same you

[priyanka4m]

We are using Zxing in Xamarin Forms for an iOS app. We are facing the same issue - Unable to reduce the scanning Area.
We use our iOS App to scan products stacked one over the other. Ability to reduce the scanning area will help us to scan only the required products. Right now, the app scans even those that are not intended to.
Is there any resolution/workaround yet on this?

[nitewulf]

I'm working on putting together a PR that addresses this. My solution allows a View (some sort of framing square/rectangle on the custom overlay) to be provided to the CameraAnalyzer class. Whatever the screen rotation/screen resolution/location of the scan area only what is inside that view will be looked at for scanning. There's also an option to autofocus that scan area. It achieves focus noticeably faster than the ContinuousPicture/Video modes.

[nitewulf]

pull request completed: #889

[MisterAcoustic]

Hello - is there any word on whether this pull request will be brought in? If so, any time frame or release planned? We really need this feature - so much so that we've already hacked our own version of ZXing.Net.Mobile - but the way we did it may have led to a decrease in the ability to scan long/complex bar codes. I'd really like to upgrade to a 3.x version that includes this feature right away.

Thanks for listening :)

EDIT: I finally saw that this was added to the '3.1 milestone' - any idea whether nitewulf's pull request is a proper fix for this issue?

[nitewulf]

MisterAcoustic,

I needed the feature for our inventory app and had to hack my own version as well. I've been working on it and other improvements for a couple of months. My PR is an upgraded 3.0 version. I took the latest master branch from Redeth's repo and modified that. If you want to pull my dev branch I'd love to hear some confirmation that it works as well as I believe.

https://github.com/nitewulf/ZXing.Net.Mobile/tree/dev-scanarea

[MisterAcoustic]

Thanks nitewulf - I'm in the process of trying to build the latest code from here. My plan was to pull your fix into that version and see how well it works :). I have a few hurdles to cross because the solution doesn't compile out of the box for me - I think I'm missing necessary installs of various things - but when I get it going, I will let you know what I find. Thanks!