Segmentation Hell: I'm in It

Recap from the weekend: I was reading papers related with Lucas-Kanade and collecting different implementations. I wanted to learn how some more advanced implementations work for my own sake.

Today I got down to comparing different implementations. In the name of K.I.S.S (Keep It Simple, Stupid), I started with OpenCV's pyramid-based Lucas Kanade, but it was totally failing because of my violations to constant brightness. My attempts at segmentation were not very good:

Basic LOG at different thresholds:

 Added a Histogram equalization stage.