QR codes–square, dot-matrix variants of the venerable UPC–are becoming an increasingly popular way to share information such as URLs, contact details, GPS coordinates, and calendar events. The idea is ...

OpenCV is used to read the image (e.g. qr-code.png) in grayscale. The image is converted into a binary image (using a threshold), where the pixels have the value 0 (black) or 255 (white). The encoding ...

QR codes are everywhere, tantalizing us with hidden information. Of course, a few of them are portals to malware or other uncool business, so it's not a good idea to just scan them all and hope for ...