Currently i am using ZBAR reader for decoding the QR codes. It is working fine. The problem occurs when QR code is heavily populated. ZBAR takes some time to read the content and due to this delay, the camera is kept open which annoys some users. So is there any way to capture the QR code as image and store in local and decode the image of QR code from local. This will stop the camera immediately and user won't see the camera opened for a long time. Thanks in advance
You didn't say anything about platform or language, but the the answer is "yes". See these examples.
Related
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.
This is kind of what a barcode scanner does, except I do not wish to detect a barcode (I will write the code for what I want to detect). How do I even set up the camera so it is a continuos scanner? Like the user just presses a play button and the camera will automatically scan for stuff? Just as an example, say I wish to run the scanner until the camera runs into the event that the whole screen is pure black, at which point it will display the message "detected all black".
There is an older Apple Technical Q&A that details how to use AVFoundation to continuously generate low resolution UIImages from a video capture session that you could then sample and use for your detection:
https://developer.apple.com/library/ios/qa/qa1702/_index.html
I have integrate the zxing lib for qr code decoding in blackberry with OS 6.
i want to know how small image can be read the QR code any possibility to read minimum small image.I have try this that it is not working for 2.5x2.5 cm image.
The device contains the 5 MP camera.
EDITED:i have check the using the default camera looking nice but in camera open by the zxing lib is not look great.so is there any way to change the quality of camera view.
Please provide me help me.
As well as the size of the code, you also need to factor in how far away the code is from the camera and whether the camera supports macro-focus mode.
I would suggest using a larger code.
I am a very beginner in Objective-C and iOS programming. I spent a month to find out how to show a 3D model using OpenGL ES (version 1.1) on top of the live camera preview by using AvFoundation. I am doing a kind of augmented reality application on iPad. I process the input frames and show 3D object overlay with the camera preview in realtime. These was fine because there are so many site and tutorial about these things (Thanks to this website as well).
Now, I want to make a screen capture of the whole screen (the model with camera preview as the background) as the image and show in the next screen. I found a really good demonstration here, http://cocoacoderblog.com/2011/03/30/screenshots-a-legal-way-to-get-screenshots/. He did everything I want to do. But, as I said before, I am so beginner and don't understand the whole project without explanation in details. So, I'm stuck for a while because I don't know how to implement this.
Does anybody know any of good tutorial or any kind of source in this topic or any suggestion that I should learn more in order to do this screen capture? This will help me a lot to moving on.
Thank you in advance.
I'm currently attempting to solve this same problem to allow a user to take a screenshot of an Augmented Reality app. (We use Qualcomm's AR SDK plugged into Unity 3D to make our AR apps, which saved me from ever having to learn how to programmatically render OpenGL models)
For my solution I am first looking at implementing the second answer found here: How to take a screenshot programmatically
Barring that I will have to re-engineer the "Combined Screenshots" method found in CocoaCoder's Screenshots app.
I'll check back in when I figure out which one works better.
Here are 3 very helpful links to capture screenshot:
OpenGL ES View Snapshot
How to capture video frames from the camera as images using AV Foundation
How do I take a screenshot of my app that contains both UIKit and Camera elements
Enjoy
I am developing my camera application that can decoded the qrcode in real time of camera on.
When I open the camera, I set the timer about every 3 seconds interval to capture picture on the screen with Display.screenshot(); method and then decoded it with zxing library while camera is on. Sometimes, it can capture the qrcode and successful decoded, but otherwise it hard to decoded the picture. I think the problem is about camera. I can not use auto focus with the camera, so the capture picture is gloomy. I want to know how to use auto focus with the camera.
My application implement on OS version 5.0 and upper version.
Could anyone help me or suggestion about new solution ?
Thank you so much
Try BBBarcodeLib available for download here: http://aliirawan-wen.blogspot.com/2011/05/barcode-scanner-for-blackberry-os-50.html.
Note that for OS6 devices you can use the built in BlackBerry barcode scanning library (built on Google ZXing).
The main problem is likely that 3 second pause. You should be decoding frames as fast as you can, which should be many times per second. This will get you a successful scan much faster.
You can and should integrate the latest zxing library instead of using that built into RIM's OS if you can, as it has small improvements that will be helpful.