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Augmented Reality (AR) combines webcam technology and computers with special symbols called markers or glyphs to allow the computer to superimpose dynamically created real-time content on top of the image seen by the webcam. The computer uses the shape of the marker to keep the computer generated content in register with the marker.
The easiest way to understand what this actually means is to try it out ...
You need a webcam attached to your PC and a copy of this marker, to show to your webcam.
Once this page has loaded, you will see a security warning over the area above. This is the webpage asking for your permission to use your webcam (you need to choose 'Allow').
Once you can see the image from your webcam, show the marker to the webcam and you will see the content projected as though it was sitting on the marker.
Please note, you need to have the marker completely in the field of view of your webcam in order for it to correctly read the marker. Dark shadows cast on the marker can also interfere with this.