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How can you generate the codes like shown below:
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Yes, round or circle QR codes are the codes rendered in a circular shape rather than square. At QRCodeChimp you may create QR codes in circular or other shapes such as heart, animals, food, drink, clothes and fun. These QR codes can also be generated in different colors, logos, stickers with CTAs and sizes to download.
As with colors, you can design your QR Code by slightly reshaping the edges or “eyes”. You can use a variety of shapes but the key is subtlety. You don't want the edges to completely reshape your QR Code.
Almost every camera app supports regular QR Codes. That means all you have to do is open up your camera, scan the Messenger QR Code and the Messenger app will open directly to the conversation.
I will assume you want to use an existing standard instead of attempting to invent your own encoder\decoder.
Any 2D barcode can be intentionally damaged for esthetics if you crank up the redundancy used for error correction. 2D barcodes are designed to survive a certain amount of damage. Placing an image in the center and rounding the corners are both considered damage from the perspective of the reader. For round corners you can't use a barcode with orientation dots in the corners, like QR. You must choose a format that is oriented with a marker in the middle like:
https://en.wikipedia.org/wiki/MaxiCode
https://en.wikipedia.org/wiki/ShotCode
https://en.wikipedia.org/wiki/Aztec_Code
Similarly, if you wanted to place an image in the center then you wouldn't want to use one that requires a bullseye for orientation, unless you can retain the bullseye somehow in your central image. To place an image in the center and also round the corners you need to get creative. In your first image there are four tracking dots around the image. In the second and third examples the company uses it's own logo as the orientation point.
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