Augmented reality is generally considered to be very hard to create. However, it's possible to make visually impressive projects using just open source libraries. In this tutorial we'll make use of OpenCV in Python to detect circle-shaped objects in a webcam stream and replace them with 3D Earth in Three.js in a browser window while using WebSockets to join this all together.
We want to strictly separate front-end and back-end in order to make it reusable. In a real-world application we could write the front-end in Unity, Unreal Engine or Blender, for example, to make it look really nice. The browser front-end is the easiest to implement and should work on nearly every possible configuration.
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