Rafi Zachut's slides on class specific segmentation

Class-Specific, Top-Down Segmentation Eran Borenstein and Shimon Ullman Presenter : Rafi Zachut Instructor : Lior Wolf

Goal ,[object Object],Motivation ,[object Object]

Bottom-up Segmentation ,[object Object],[object Object],[object Object]

Difficulty of class-specific segmentation ,[object Object],Solution ,[object Object],[object Object]

Training – Searching the fragments ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Fragment information ,[object Object],[object Object],[object Object]

Segmentation by Optimal Cover ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Individual Match ,[object Object],[object Object]

Consistency ,[object Object],[object Object]

Fragment Reliability ,[object Object]

A Cover Score ,[object Object],[object Object]

Finding the Optimal Score ,[object Object],[object Object],[object Object],[object Object]

The Cover Algorithm ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Scaling ,[object Object],[object Object]

Advantages ,[object Object],[object Object],[object Object],Disadvantages ,[object Object],[object Object]

Combining Top-down and Bottom-up segmentation Eran Borenstein Eitan Sharon Shimon Ullman

Bottom-up vs. Top-down Inaccurate boundaries Accurate boundaries Figure-ground approx. Multiple segments Use class information Rely on image criteria

Bottom-up in a nutshell ,[object Object],[object Object],[object Object],[object Object]

Bottom-up segmentation tree ,[object Object],[object Object]

Bottom-up Saliency Measurement ,[object Object],[object Object],low saliency high saliency Internal homogeneity Dissimilarity with the surrounding saliency + =

Top-down & Bottom-up - Goal ,[object Object],Top - down Top – down & Bottom-up

The Approach ,[object Object],[object Object],[object Object],[object Object]

Top-down & Bottom-up conflict ,[object Object],[object Object],[object Object],[object Object]

The Top-down cost ,[object Object],Bottom-up cost ,[object Object],[object Object]

The Total cost ,[object Object],[object Object],[object Object],[object Object]

Minimizing the cost function ,[object Object],[object Object],[object Object]

Confidence map ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object]

Rafi Zachut's slides on class specific segmentation

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Rafi Zachut's slides on class specific segmentation