Here is a swarm of robots that use monocular Visual Inertial Odometry to perform all the estimation onboard without requiring an external motion capture system or GPS. It is scalable and can be used indoors or outside.
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VIO-Swarm: A Swarm of 250 g Vision Based Quadrotors
These drones fly in unison without any collision to put on a show. Vijay Kumar and his team of researchers are responsible for this.
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