There are lots of ways to process infrared imagery to analyze plant health. Here are a few:

Infragram.org

(more coming soon)

Image Sequencer

A pure JavaScript sequential image processing system, inspired by storyboards

Image Sequencer is different from other image processing systems in that it's non-destructive: instead of modifying the original image, it creates a new image at each step in a sequence. This is because it:

• produces a legible trail of operations, to "show your work" for evidential, educational, or reproducibility reasons
• makes the creation of new tools or "modules" simpler -- each must accept an input image, and produce an output image
• allows many images to be run through the same sequence of steps

• works identically in the browser, on Node.js, and on the commandline

• Demo: https://publiclab.github.io/image-sequencer/

• Source code: https://github.com/publiclab/image-sequencer/

Photo monitoring plugin

@nedhorning has developed a plugin for ImageJ (aka Fiji, on the Mac) which can do a lot of powerful infrared compositing work, including batch conversion and image alignment.

Python

For those who use the webcam and have a Python interpreter, there are some image processing codes available at Python Webcam Codes.