zbar | open source library that will let your Marmalade app scan | QRCode Processing library
kandi X-RAY | zbar Summary
kandi X-RAY | zbar Summary
Only supports QR code functionality. Tested and used in production apps. License: GNU Lesser General Public License, version 2.1.
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QUESTION
I'm trying to build a realtime barcode reader using pyzbar. I have only EAN-13 barcodes and some of them are read properly but some are recognized as PDF417 and I get this message: WARNING: .\zbar\decoder\pdf417.c:89: : Assertion "g[0] >= 0 && g[1] >= 0 && g[2] >= 0" failed How to increase efficiency? Maybe there is another python library which I can use?
This is my code:
...ANSWER
Answered 2021-May-07 at 13:57If you only have EAN-13, you could specify that so pyzbar would only check for EAN-13. You can specify the desired codes in a list to the parameter symbols when calling decode(...).
QUESTION
Using the example CLI (command-line-interface) pipeline from the documentation:
...ANSWER
Answered 2021-Mar-17 at 23:14After not finding anything, anywhere online, I decided to read the manual again to get a better understanding of the mechanisms behind. The answer was quite simple: message.get_structure().to_string()
Also we can probe when this is triggered by seeing when t == Gst.MessageType.ELEMENT
QUESTION
I used Zbar (and ZXing) to read the QR code in many images like the below one, but both failed to detect it. I think I need some transformation, because when I use ZBarImg from console, it fails. On the other side, when I use ZBarCam and I put the document in front of the webcam on my laptop, it detects and decodes QR code instantly.
There are images that QR is detected correctly and images really similar to the successful ones that fail.
I tried to use ImageMagick to resize the image, remove borders, greyscale, blur it, deskew, multiple scripts from @fmw42 "Fred's ImageMagick Scripts" (unperspective...). Nothing helped. I judge it has to be some simple transformation, because ZBarCam does it almost instantly.
Do you have any idea?
...ANSWER
Answered 2020-Nov-14 at 21:36I am not sure what you have tried in Imagemagick, but my unperspective will not help this image. It will not correct for wrinkles.
But here is what I would do. First threshold, then apply morphology. The use connected components to get get the bounding box of QR code block. The crop the QR code out of the original image and use morphology to make the black regions more distinct.
Input:
QUESTION
I am using this lib https://github.com/codenameone/cn1-codescan to scan QR codes in my application. As I understand there is no functionality to change scanning/camera view right now in this lib
Currently, scanning view for Android it is just fullscreen camera view and for iOS smth like this http://zbar.sourceforge.net/iphone/userguide/scanning.html
Is there any way to add an overall image or change that camera view? Or is there any plans to add some LayredPane to the camera view in this lib?
...ANSWER
Answered 2020-Oct-30 at 06:04This won't work for cn1-codescan since that library is implemented as an external native view. So we're effectively leaving Codename One to perform the scan. You can implement this natively within the library.
Alternatively you can build a library that uses a widget approach instead of moving to a separate activity/view like the current solution. If it uses a peer component (like the camera kit or the Google Maps cn1libs) then you can implement overlays in Codename One.
Notice that we only use zbar on iOS and on Android we use an activity which uses an external app to do the scanning. There's a 3rd party QR scanner (from Little Monkey) which embeds an Android implementation into the cn1lib. I'm not sure about the overlay implementation there.
QUESTION
How can I decode a qr code in python 3.6 in Anaconda 4.8.3 a Windows 10 Pro N 64 bit installation?
Most solutions require Pillow with zbar. However, it appears zbar is only available on 32bit
windows installations. Furthermore, pip install zbarlight yields:
ERROR: No matching distribution found for pyzbarlight
To try and decode a qr code in python 3.6 in Anaconda 4.8.3 on a Windows 10 Pro N 64 bit device, I tried the following code:
...ANSWER
Answered 2020-Aug-07 at 09:41Windows error message
If you see an ugly ImportError when importing pyzbar on Windows you will most likely need the Visual C++ Redistributable Packages for Visual Studio 2013. Install vcredist_x64.exe if using 64-bit Python, vcredist_x86.exe if using 32-bit Python.
visit and read please here https://pypi.org/project/pyzbar/ or github homepage https://github.com/NaturalHistoryMuseum/pyzbar
I use Ubuntu for my purposes, so I cannot check this out, but in home project README they give information about ugly ImportError. If they talk about 64 bit installation, then pyazbar works on 64-bit Windows, please doublecheck that Visual C++ Redistributable Packages for Visual Studio 2013 is properly installed and other requirements are satisfied also.
QUESTION
I am deploying a python flask app to heroku which uses Zxing to read qr codes(scan them) and give out the data on them, however Zxing requires Java on the heroku environment.
Zxing : https://github.com/dlenski/python-zxing
Error with Zxing
...ANSWER
Answered 2020-Aug-09 at 12:50I have managed to solve my error by adding the buildpack
QUESTION
I want to make a script for detecting and reading QR codes from photos. I would like to use PyZbar for that, but I have a problem with some errors.
I'm working in google colaboratory
...ANSWER
Answered 2020-Aug-03 at 04:49Before you can !pip install pyzbar, you need to install libzbar with this command.
QUESTION
my app contains barcode scanner, i used Zbar scanner and it worked but the following error keeps appearing and I searched alot I didn't find any solution the error :
...ANSWER
Answered 2020-Jun-05 at 03:10i found the problem in the code I should remove mScannerView.startCamera() from onResume method
QUESTION
I used Zbar and OpenCV to read the QR code in the image below but both failed to detect it. For ZBar, I use pyzbar library as the python wrapper. There are images that QR is detected correctly and images really similar to the successful ones that fail. My phone camera can read the QR code in the uploaded image which means it is a valid one. Below is the code snippet:
...ANSWER
Answered 2020-Apr-27 at 03:08zbar, which does some preprocessing, does not detect the QR code, which you can test running zbarimg image.jpg.
Good binarization is useful here. I got this to work using the kraken.binarization.nlbin() function of the Kraken library. The library is for OCR, but works very well for QR codes, too, by using non-linear processing. The Kraken binarization code is here.
Here is the code for the sample:
QUESTION
I have ported an app from Eclipse to Android Studio, implemented my needed flavors and have it allow working in Android Studio. Due to the number of flavors I would prefer to build it using command line Gradle. However when I run the following command to build my release APKs
...ANSWER
Answered 2019-Jan-26 at 02:44For anyone facing this issue in the future, for the command line build make sure your JAVA_HOME is set to the same version as Android Studio is using. E.g. JDK v8:
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