OCRDrone is a NodeJS application written for a NodeCopter demonstration.
OCRDrone uses the drone's video camera to continuously save camera footage to the filesystem, passing each image to nodecr for text recognition. If the text is recognised as a valid command, it is then translated into flight commands and sent to the drone in real-time.
You can see a short video of this application being demoed at NodeCopter Southampton. (Skip through to 12:10).
Here's another video of exactly the same demo, created by stitching together all the images captured by this application. This is what OCRDrone sees and processes.
ar-drone - http://github.com/felixge/node-ar-drone:
npm install ar-drone
nodecr - http://github.com/joscha/nodecr:
npm install nodecr
The following applications also need to be downloaded and installed on your system. NOTE: the executable binaries of each must be available in your system path.
Although it is possible to show text to drone's camera using a laptop/tablet, we found that text printed on paper worked much better.
The longer the text/command, the better the match. We found that tesseract preferred "LAND PLEASE" to just "LAND".
It appears that the video stream can only be consumed by one application. So, if you're capturing the onboard video with another application, then you might get TcpVideoStream errors from OCRDrone.
Occasionally, we got TcpVideoStream errors when starting the application. Pressing Ctrl+C and restarting the application a couple of times eventually got it working. Sometimes we had to disconnect/reconnect to the WiFi.
I'd be interested in hearing about any usages of or any ideas stemming from this application.