Adobe Photoshop-style posterization and OpenCV

Question

It seems Adobe Photoshop does posterization by quantizing each color channel separately, based on the number of levels specified. So for example, if you specify 2 levels, t

Answer 1

The coolest "posterization" I have seen uses Mean Shift Segmentation. I used the code from the author's GitHub repo to create the following image (you need to uncomment line 27 of Maincpp.cpp to perform the segmentation step).