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Live-Wire Segmentation with "shortest path"

Live-Wire Segmentation with "shortest path". By Ilan Smoly. What is segmentation?. Approaches with graphs. Intelligent scissors and Live wire - Optimal path (Dijkstra) Binary images posteriori estimation – Min-cut/Max-flow Seeds – Min-cut/Max-flow with user inputs. Live - Wire.

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Live-Wire Segmentation with "shortest path"

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  1. Live-Wire Segmentation with "shortest path" By IlanSmoly

  2. What is segmentation?

  3. Approaches with graphs • Intelligentscissors and Live wire - Optimal path (Dijkstra) • Binary images posteriori estimation – Min-cut/Max-flow • Seeds – Min-cut/Max-flow with user inputs.

  4. Live - Wire

  5. The graph • Oriented Boundary • Intelligent Scissors

  6. Oriented Boundary • Intensity • Various gradient magnitude • Orientation-sensitive

  7. Intelligent Scissors • Laplacian Zero-Crossing • Magnitude: • Gradient Direction

  8. Shortest path with Laplacian cost

  9. Livewire on the Fly • A pruning of Dikstra • Stops when target is reached

  10. Results

  11. Results directionality Magnitude Power

  12. No magnitude • No Directionality • No Power

  13. Directionality = 13 • Power = 30 • Magnitude = 43

  14. Discussion • powerful and efficient tool for image editing and analyzing. • Medical use • Not reliable for long distance pathways

  15. Improvement • random long distance relations between pixels • Adopting the biological model

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