During the last 6 months as part of the LRDE (EPITA Research & Development Lab), I've been working on Climb, a Common Lisp image processing library. I've written a report and presented it. You can download the slides and report.
Climb - Chaining Operators & Component Trees
Abstract: Climb is a generic image processing library designed to be used for rapid prototyping. The implementation of two component trees algorithms impacts Climb in several ways: the definition of values is extended, new site sets are added and debugging utilities are improved.