I have been reading a lot recently about NDVI and am going to have a go at producing some images using a rpi NOiR camera with the blue filter to gather some NIR rich images. I am trying to look at plants (Lettuce) and how the NDVI changes over time as a potential quality parameter.
I have been searching through Public Lab's site and can't quite find the information I am seeking, so I thought I would ask the question. I know the calculation for NDVI -- (NIR - R) / (NIR + R).
My question is about how i would calculate this. My current thinking is that if I take a picture with and without the filter (as the filter will only allow blue light and NIR through) and RGB image would now be NGB? and then I could simply do the calculation from those images.
Using the code here -- https://publiclab.org/wiki/python-webcam-codes
I am working out of a University in the United Kingdom