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Questions tagged [qr-code]

QR code is an ISO-standardized two-dimensional barcode format.

Here is a sample QR-Code, pointing to Tag wiki qr-code

Simple QR Code

A Qr-code decoder has many specific patterns to recognize how to read the QR-code

Eyes

Eyes Qr code

Alignment

Alignment

Timing

Timing

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ARKit – How to put 3D Object on QRCode?

I'm actually trying to put a 3D Object on QRCode with ARKit For that I use a AVCaptureDevice to detect a QRCode and establish the area of the QRCode that gives me a CGRect. Then, I make a hitTest on every point of the CGRect to get the average 3D…
Alain Berrier
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Decode QR Code Image from Camera Roll React Native

I'm trying to implement a feature in my app where I the user can select a picture from their camera roll and the app will decode a QR code in the image is detected. I'm currently using react-native-camera-roll-picker:…
Armin
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How can QR code store so much data?

Quick googling result that QR code can hold nearly 3kb (8 bit) data. But isn't it just using black/white dots to represent bits? If so there's no way that there's over 20,000 dots on a code. So I'm obviously misunderstanding. Can someone explain how…
Yellowmoon
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Reading QRCode with Zxing in Java

Some questions about using Zxing... I write the following code to read barcode from an image: public class BarCodeDecode { /** * @param args */ public static void main(String[] args) { try { String…
Johnny
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QR code, can be generated with R?

Can QR codes be generated in R? Is there is a package that allows it?
user1216772
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How to make a QR code reader

I want to make a QR code reader for android app. if you all have any information to create it please share with me.
AndroidDanger
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QR code with URL, does it *REALLY* need the http://?

It seems like most (if not all) QR readers on my iPhone handle URLs without the http:// just fine but I was wondering if that is universal? Android? BlackBerry? Is there an RFC somewhere that I should be reading I'm building a QR management/url…
Dan Berlyoung
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How do I capture QR Code data in specific area of AVCaptureVideoPreviewLayer using Swift?

I am creating an iPad app and one of it's features is scanning QR codes. I have the QR scanning part working, but the issue I have is that the iPad screen is very large and I will be scanning small QR codes of of a sheet of paper with many QR codes…
The_Dude
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Android - QR generator API

I'm trying to generate some QR from my app, but I've seen there's a lot of types of QR like contact, Wi-Fi, etc.. And I'm wondering if there's a free API or library to implement this, I've seen that there's websites that are already generating it so…
StuartDTO
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Find QR code in image and decode it using Zxing

First of all, I read through all those topics how to use Zxing in Java but always got errors with missing com.google.zxing.client.j2se.* (I loaded the zxing core-3.2.1.jar in eclipse and all other zxing packages work unless j2se) or just found…
user3646022
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How to read binary QR Code with AVFoundation?

Is it possible to read a binary encoded QR Code with AVFoundation? I can get a AVMetadataMachineReadableCodeObject object of .type AVMetadataObjectTypeQRCode, however this only has a stringValue property, which won't work, because the data contained…
Michael Bates
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How can I generate an image that will be similar to Snapchat's Snapcode and will be used in the same way?

I'm building an app that uses a QR Code to connect users, similar to how Snapchat allows users to add each other on Snapchat. I was hoping to use a more aesthetically pleasing alternative to the QR Code, something similar to Snapchat's Snapcode. Any…
Rohan Mishra
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Android: Generated QR code using Zxing has margins (is not fit to the area)

I'm using in my app ZXing library for generating QR code. I want to generated QR code that should fits to the width of the screen (maybe some small padding). If I set width of the screen as width size of QR code I get smaller QR code. Look at the…
Pepa Zapletal
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iOS 7 AVCaptureMetadataOutput delegate (QRCode scanner)

I'm trying to implement a QRCode scanner with the new iOS 7 features but my code isn't calling the main AVCaptureMetadataOutputObjectsDelegate method. I've used the AVFoundation camera before and with my current implementation I've got the preview…
Ricardo RendonCepeda
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Create QR-Code in vector image

I can successfully create QR Code PNG images with ZXing but there is no easy way to get the output as SVG or EPS. How can I create a vector image from the BitMatrix object that is created by the QRCodeWriter?
Micha Roon
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