Previously Unpublicised Code: RPiNDVI
It isn’t perfect, and it isn’t finished – but it does the job as a proof-of-concept. If you point the camera out of your window you should see high NDVI values (white) over vegetation, and low NDVI values (black) over various other things (particularly the sky!).
This is the point at which I would like to include a screenshot of the program running…but unfortunately I can’t actually find my Raspberry Pi to run it! (I guess that’s the problem with small computers…).
I can’t say the code is exceptionally exciting – it’s only about 100 lines – but it might be useful to someone. It demonstrates how to do real-time (or near-real-time) processing of video from the Raspberry Pi camera using OpenCV, and also has a few handy functions for doing contrast stretching of imagery and combining multiple images on a single display.
As always, the code is available at Github, along with a list of requirements – so have fun!