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This is a much better alternative and works completely in client side js

http://www.robots.ox.ac.uk/~vgg/software/via/

http://www.robots.ox.ac.uk/~vgg/software/via/via_demo.html

The idea is to use OpenCV so that later it uses SIFT and Tracking algorithms to make labeling easier. I wanted this tool to give us automatic suggestions for the labels!

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