This is the first in our lab's series of ImageJ Tutorials! This tutorial is all about measurements on diseased leaves!
In this video we:
1 - 0:36 - Download ImageJ
2 - 1:46 - Set scale for a photograph
3 - 3:53 - Set scale for a scanned image
4 - 5:38 - Measure leaf disease area for sampled leaves
5 - 12:45 - Measure canopy disease area for multiple plants
6 - 21:01 - Count leaf lesions for a scanned image
7 - 26:37 - Count leaf lesions for a field photograph
The written protocol is available at https://edis.ifas.ufl.edu/hs1382.