this is my 1st question here but i guess i'll keep it short.
I'm currently working on an app to scan QR codes and came across a code that cant be scanned.
After some testing, I found out that the QR scanner app (from playstore) works but the output looks different from the original printed QR code. May I know why?
Thanks for any tips :)
Printed code
Code detected by the app
Related
The context of this problem is weird (a magic trick that occurred to me), so I will skip that explanation and go straight to the point.
What I want: a set of QR codes (it can be just 1, or 2 different ones, either way will work for me). These QR codes may be scanned with a regular smartphone QR scanner to show some kind of text. My initial idea was a simple HTML page with the message in plain text. The difficult part is this:
Whenever someone scans the QR for the first time, certain message is show. But the second time, another message is shown. If it's just one QR code, I would like it to follow that sequence (alternating between the two messages). If there are 2 QR codes, I would want the first one scanned to display the first message (always) and the second one scanned to show the second one (always); the first scanned QR would determine which message will be shown in each one. The scan of one QR by one cell should not affect the scan of another phone (their functionality flow is independent).
I got some limitations though:
It must work just with the QR scanner a regular Android smartphone has (don't want the person installing any app).
I would like avoiding having to pay a server to store a page that has the functionality. The ideal scenery is the QR behaving like this by itself (maybe containing the proper script inside the QR).
I know how to generate QR codes and how to store HTML code in them using data:text/html protocol. My problem is the design of this functionality. Is there a way I can embed that functionality into a QR code (or two) without it being an URL to a web that stores the functionality? If not, which is the easiest way to achieve this?
Any help will be appreciated, thanks in advance.
I have developed a QR code generation code for a client; however, they expect another QR code (visually) than what my code generates.
Although, I respected all the configuration of QR generation, but that seems to be issue there.
Hence, is it possible to reverse engineer the configurations from a QR code?
I am working on a Xamarin QRCode scanner prototype and the aim is to make the App being able to scan QR codes as small as 1.8/1.8 mm. I have tried the GoogleVision and also the ZXing. The GoogleVision is able to scan them but it is not convenient at all since it hardly depends on the Camera quality, position, illumination, and stability. Also tried Camera / Image Scannig to take a picture while the user is able to zoom on the QR code, still so hard to do that for a user (it cannot detect the QR code 9 out of 10).
TBH, I have searched a lot and manipulated these libraries and couldn't get it to work. On the other hand, there are Apps on the market that they can simply scan these small QR codes. (which I believe they are not based on Xamarin) I have noticed some of them are using ZXing but I couldn't find any useful information on how they are managing these small QR Codes! So my question is:
Is it possible to use Xamarin and ZXing or GoogleVision for this matter? If yes, any further information would be hugely appreciated.
Is there any library that can handle these small QR codes (Commercial or non-commercial)?
Thank you in advance.
Cheers 🤘
Do any of you know what to call these codes? My best guess is custom QR codes. Facebook (messenger) and Snapchat has their own QR codes and I want to look into how to create these - well my own of course!
Does anyone here have anything I could research? A mane? Some documentation or just something?
Have a wonderful day!
Those QR codes are either using the "Frame QR" format or taking advantage the error correction bits to recover the damage done by placing a logo in the middle of the barcode. QR codes have 4 levels of error correction that can be added to the code to allow a partially damaged barcode to still be readable.
For more information: https://www.qrcode.com/en/codes/
I have some member cards with a QR code printed on them. How can I read the code, and then generate the exact same QR code, so I can have the picture of the code and attach it to other documents.
I've tried app qr readers, and online qr generators, but it always generates a different qr code.
Thanks!