Scanned QR Code is not recognized
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 15/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Stale
- Tech stack
- csharp
- Domain
- cli, computer-vision, desktop-dev
Research direction
Start by reproducing the failure with the attached printed-and-scanned QR image through the CommandLineDecoder and the WindowsFormsDemo in the Clients folder. Investigate the image preprocessing and binarization path in the core decoder, since the 44-comment thread shows no agreed fix. Done means the scanned sample decodes reliably, with a regression test added.
Written by the indexing model from the issue text.
Description
Hi,
I am having trouble with decoding the following QR code. The Code has been printed and then scanned again and can then no be read anymore by the ZXing library.
I mostly tried with the CommandLineDecoder and the WindowsFormsDemo from the Clients folder. I tried with all kinds of different settings but none seem to work.

What do I need to do to make this work?
Thanks for your help.
- Dominant language
- C#
- Stars
- 3.1k
- Forks
- 704
- Avg merge
- 13d 17h
- Merged PRs (30d)
- 2
Getting set up
This project ships no dev container, Dockerfile or contributing guide, so setting up is up to you: start from its README, and see our first-contribution guide for the general steps.
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
More from micjahn/ZXing.Net
-
crop() overrides document "0 <= top <= Height"; should be top < Height like left < WidthPossibly taken A pull request linked to this issue is open or already merged. Open
Difficulty 1/5 Under an hour Newbie friendliness 92/100
-
Difficulty 2/5 1-3 hours Newbie friendliness 62/100
-
Difficulty 3/5 Half a day Newbie friendliness 22/100
-
Difficulty 3/5 1-2 days Newbie friendliness 42/100
-
Difficulty 4/5 3-5 days Newbie friendliness 12/100
All issues in micjahn/ZXing.Net
Similar issues
-
Difficulty 2/5 1-3 hours Newbie friendliness 78/100
-
area: core priority: low type: bug
Difficulty 2/5 1-3 hours Newbie friendliness 74/100
RicoSuter/Namotion.Interceptor#863 ·
Maintainers usually reply within 1 day
-
Difficulty 2/5 1-3 hours Newbie friendliness 76/100
bitfoundation/bitplatform#14428 · 1 comment ·
Maintainers usually reply within 1 day
-
area-cli
Difficulty 2/5 1-3 hours Newbie friendliness 72/100
Maintainers usually reply within 1 day
-
0.3.0
Difficulty 2/5 1-3 hours Newbie friendliness 78/100
Maintainers usually reply within 1 day