We have written an Insight Journal (IJ) article describing our implementation of the simple linear iterative clustering (SLIC) super pixel algorithm. Although the upload process to IJ does not appear to be working right now. I uploaded a copy to GitHub for your reading pleasure..
This article includes scalability analysis and threading performance. This is a hot topic in ITK these days with the exciting new TBB, and thread pool back ends. This implementation uses the older ITKv4 threading model for portability. However, with the clearly documented implementation, and the analysis framework provided in the repository, it is an opportunity to evaluate how the new threading model can be applied to a complex filter with multiple threading strategies.
I have also initiated a pull request for adding the filter to a new ITK module directly in ITK. This filter is a newer, and unique algorithm for ITK which I believe helps round out the selection of segmentation methods available in ITK. I hope that it will be welcomed addition to the ITKv5 release.