My Greetings,
First of All, when I saw the Title of your project, immediately I felt engaged with it,...and why because there are may Apps around this leaf inspection and detection of diseases but you want to do a kind of App customized.
As you know this is an Image or Video processing Project, with the use of Pattern Recognition, Machine Learning, and so on.
See my brand on google: AMVITABLE (All Monitoring Video Image Telemetric Analysis)
Contact me ASAP. The job we could do it with ImageJ, Matlab, Python + OpenCV, etc
Thanks in Advance