[4/1] Normalized Cuts and Image Segmentation

Image segmentation
- spatial space
  - region growing
  - watershed
- feature space
  - kmeans
- graph based

Min Cuts
NP-complete -> eigen problem to approximate

recursively two-way Ncut
- when eigen value still small
- when inter-group pixels are not very similar (still can be segmented)
simultaneous K-way cut
- iterative merge

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