Use system native SDK AVFoundation scan qr code, when the qr code contrast is not high, scanning not to come out
QRCode
my demo
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I'm trying to create an application that detects all the QR Codes in my current camera frame, but am limited in that AVFoundation seems to only give me 4 QR Codes focused near the middle. Is it possible to detect more QR Codes simultaneously in one frame?
Code: pretty much this
Welcome!
It seems you can use Vision to detect all QR codes in an image.
From the docs of VNDetectBarcodesRequest:
By default, a barcode request first locates all barcodes in the input image, then analyzes each to decode payload.
(Note that even though it's named "barcodes", the symbologies also support QR.)
This tutorial might be helpful.
I am trying to build an iOS application that uses Firebase MLKit to recognize text from live camera frame.
I found an Android sample here.
https://medium.com/digital-curry/firebase-mlkit-textdetection-in-android-using-firebase-ml-vision-apis-with-live-camera-72ef47ad4ebd
Does anyone know good sample in iOS?
Text Detection From Firebase MLKit:
You can find demo code for Image to Text conversion using Firebase MLKit in iOS.
https://github.com/sayaleepote/TextDetect
For live recognization, you can create a custom camera and take a picture in the background periodically and detect a text from an image.
Custom Camera View for Capture Images:
For custom camera view, you can use below sample code.
Link: https://github.com/AlexLittlejohn/ALCameraViewController
Note: You can achieve this feature using iOS native MLKit + Vision framework
Refer This link for iOS native framework.
https://stackoverflow.com/questions/50918310
Let me know if you have any query.
Thanks.
The native AVFoundation QR code scanner just can't see a low-contrast QR code that I need to be able to scan. I know it's possible to scan the code though, because it works fine with WeChat's QR scanner.
How do I scan this QR code? Is there a way to adjust my AVCaptureSession to allow for lower-constrast QR codes? Is there a package I can use that would be better?
Try to set capture quality to high.
session.sessionPreset = .high
I got it working with Zbar. Super easy to use, too. Here's a tiny demo (Xcode 9.3 and Swift 4.1): https://github.com/philipshen/ZBar-Demo-Swift-4
I want to programmatically read numbers on a page using mobile's camera instead from image, just like barcode scanning. I know that we can read or scan barcode but is there any way to read numbers using same strategy.
The documentation and the header file does not contain any information related to support of 3D barcodes. However, explicitly mentions AVMetadataMachineReadableCodeObject supports one-dimensional and two-dimensional barcodes. Therefore, does anybody know 3D Barcodes are supported by AVFoundation ?
Supported QRCodes by AVFoundation are upce,code39,Code 39 mod 43,EAN-13,EAN-8,code93,code128,pdf417,Interleaved 2 of 5,ITF14,DataMatrix ,Aztec & All of them are 1d/2d .https://www.scandit.com/types-barcodes-choosing-right-barcode/
If we try to go into detail of 3d bar codes which are called Custom QR Codes, The bars in a 3D barcode are read by a scanner that reads the differences in the height of each line .http://www.qrcodestickers.org/qr-code-articles/3D-barcodes.html.