Fig. 2.

Example of superpixel segmentation with different window sizes: a original MRI FLAIR image with a grade II tumour, b superpixel segmentation with $S=10$ (initial grids $10\times 10$) and $m=0.2$, c superpixel segmentation with $S=20$ (initial grids $20\times 20$) and $m=0.2$