Harry Potter's Marauder's Map
Localizing and Tracking Multiple Persons-of-Interest by Nonnegative Discretization

Shoou-I Yu, Yi Yang, Alexander Hauptmann. Carnegie Mellon University.
IEEE CVPR 2013. (pdf)

"I solemnly swear I am up to no good." Harry Potter and the Prisoner of Azkaban.

2014 Nov. IEEE Signal Processing Magazine

2013/12/19: The Marauder's Map paper was elected as the 13 Incredible Tech Inventions You Won't Believe You Missed In 2013 by Huffington Post!

We set out to make Harry Potter's Marauder's Map come true! For the details of the algorithm, please refer to the paper here.

Above is a snapshot of our Marauder's Map. The map in the bottom right is a map of the facility.
The arrows are added to show which dots on the map correspond to which person.
Not all camera views are shown. Not all arrows are shown to increase readability.

Demo Video (20MB)