barcelona june 2013 1 · barcelona june 2013 1 . ii- ground truth energies and saliency transform...
TRANSCRIPT
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Barcelona June 2013 1
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• The hierarchical cuts theory
• Climbing energies and optimal cuts
Jean Serra B. Ravi Kiran
LIMG ESIEE Université Paris-Est
UPC / Pompeu Fabra Barcelona, June 13 2013
Barcelona June 2013 2
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The goal
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Unicity problem
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How to get out ?
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Plan
1. Hierarchies
2. Singular energies and lattices
3. Optimal cuts and hierarchical increasingness
4. Compositions of energy by sums and by suprema
5. Climbing families of energies.
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Hierarchy, or pyramid, of partitions
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Hierarchy, or pyramid, of partitions
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Representation of a hierarchy
a d g
b e h
c f i
A B C E
a b c d e f g h i
A B C
E
S C
S C
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Energy and pyramid
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Plan
1. Hierarchies
2. Singular energies and lattices
3. Optimal cuts and hierarchical increasingness
4. Compositions of energy by sums and by suprema
5. Climbing families of energies.
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Energetic ordering on cuts
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Energetic ordering and singular energy
….. ….. > or
<
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Energetic Lattice
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Energetic Lattice
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Plan
1. Hierarchies
2. Singular energies and lattices
3. Optimal cuts and hierarchical increasingness
4. Compositions of energy by sums and by suprema
5. Climbing families of energies.
Barcelona June 2013 16
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Hierarchical increasingness
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Climbing energies
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Hierarchical increasingness
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Algorithms
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Plan
1. Hierarchies
2. Singular energies and lattices
3. Optimal cuts and hierarchical increasingness
4. Compositions of energy by sums and by suprema
5. Climbing families of energies.
21 Kiran-Serra, Barcelona, June 2013
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How to construct a climbing energy?
T3
T2
T1
S
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How to construct a climbing energy?
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Sum generated energies (Salembier-Guigues)
3 3 2 4 3 4 12 4 5
10 2 5 4 12 8
9 5 20
35
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Sum generated energies (Salembier-Guigues)
3 3 2 4 3 4 12 4 5
10 2 5 4 12 8
9 5 20
35
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An example : Mumford-Shah
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T3
T2
T1
S
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Optimal Cut: Luminance
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• c
• cp
• cd
• g • r
• b
Luminance axis
Chromatic
plane
Luminance-Chrominance
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Optimal Cut: Luminance
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T3
T2
T1
S
Another example: color and texture
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S
Partition with min variation
in component sizes
Another example: color and texture
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Another example: color and texture
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Another example: color and texture
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Composition of additive energies
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Additive energies and graph-cuts
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1 1 4 2 3
3 3
8 T
S
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Min-cut versus optimal cut
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1 1 4 2 3
3 3
8 T
S
0 1 4 2 3
2 3
7
S
T
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Min-cut versus optimal cut
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1 1 4 2 3
3 3
8 T
S
0 0 4 2 3
1 3
6
S
T
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Min-cut versus optimal cut
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1 1 4 2 3
3 3
8 T
S
0 0 4 0 2
1 0
3
S
T
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Min-cut versus optimal cut
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3 3 2 4 3 4 12 4 5
10 2 5 4 12 8
22 5 21
35
Suprema generated energies (Soille-Grazzini)
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3 3 2 4 3 4 12 4 5
10 2 5 4 12 8
22 5 21
35
Suprema generated energies (Soille-Grazzini)
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V-generated energies (Akçay-Aksoy)
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3 3 2 4 3 4 21 4 5
10 2 5 4 21 3
9 5 20
15
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V-generated energies (Akçay-Aksoy)
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3 3 2 4 3 4 21 4 5
10 2 5 4 21 3
9 5 20
15
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Infima generated energies Ground truth Evaluation
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Composition of V-generated energies
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Plan
1. Hierarchies
2. Singular energies and lattices
3. Optimal cuts and hierarchical increasingness
4. Compositions of energy by sums and by suprema
5. Climbing families of energies.
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Climbing families of energies
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Another Example
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Another Example
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Another Example
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• We replaced the numerical approach
by the lattice one
which adds a local meaning to the global energy w, (similar to
the uniform convergence versus the simple one).
energy +
singularity
Lattice of the cuts
optimal partition
energy optimal
partition
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Conclusions
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• We replaced the variational approach by the axiomatics
which allows the fast computation
• We introduced the climbing families of energies
Which results in
Singular and h-increasing energy = climbing energy
Climbing families
of energies
Hierarchies of
optimal partitions
climbing energy optimal cut in one pass
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Conclusions
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…. A study by my student Barcelona June 2013 55
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…. A study by my student, and me. Barcelona June 2013 56
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Thanks
For your
attention !
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Barcelona June 2013 1
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II- Ground truth energies and Saliency Transform
B. Ravi Kiran Jean Serra
LIMG ESIEE Université Paris-Est
Barcelona June 2013 2
UPC / Pompeu Fabra Barcelona, June 13 2013
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Problem context
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A Problem: Inputs
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Ground truth: Evaluation of Hierarchies
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Problems
1. Given a hierarchy H and ground truth partition G find the partition in H closest to G.
1. Closest from H -> G
2. Closest from G -> H
2. Compare any hierarchy H with multiple ground truth partitions of the same image
3. Compare any two hierarchies H1, H2, with respect to a common ground truth partition G
6 Barcelona June 2013
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Hausdorff distance and associated problems
Y
X
i.e. smallest disc dilation of X that contains Y and of X to contain Y
- Global Measure - Large variations when object are asymmetric w.r.t each other
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Local Hausdorff distances
• Local measures: Each class S in H is assigned 2 radii: ,
• Both are h-increasing energies
• Local optimization to obtain a globally optimal solution
8
minimum radius of dilation of ground truth contour that covers the contour of S.
minimum radius of dilation of the contour of S to cover GT within S. Barcelona June 2013
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Example
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Energy at various levels of H
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Energy at various levels of H
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Problems
1. Given a hierarchy H and ground truth partition G find the partition in H closest to G.
1. Closest from H -> G
2. Closest from G -> H
2. Compare any hierarchy H with multiple ground truth partitions of the same image
3. Compare any two hierarchies H1, H2, with respect to a common ground truth partition G
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Optimal Cuts
Initial Image
GT2 13 Barcelona June 2013
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Optimal Cuts
Initial Image
GT7 14 Barcelona June 2013
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Problems
1. Given a hierarchy H and ground truth partition G find the partition in H closest to G.
1. Closest from H -> G
2. Closest from G -> H
2. Compare any hierarchy H with multiple ground truth partitions of the same image
3. Compare any two hierarchies H1, H2, with respect to a common ground truth partition G
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Composition of ground truths:
GT5_1 GT5_2 GT5 = GT5_1 + GT5_2
The distance function of the union(sum) is the inf of the distance functions 16 Barcelona June 2013
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Composition of ground truths:
GT5_1 GT5_2 GT5 = GT5_1 + GT5_2
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Problems
1. Given a hierarchy H and ground truth partition G find the partition in H closest to G.
1. Closest from H -> G
2. Closest from G -> H
2. Compare any hierarchy H with multiple ground truth partitions of the same image
3. Compare any two hierarchies H1, H2, with respect to a common ground truth partition G
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Global Precision-Recall Energies
Local dissimilarity measure Counterpart Global similarity measures
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The two half distances yield two local and then two global energies: • Precision (P) : How close is on average the ground truth to the class (G->S) • Recall (R) : How close is on average the Class contour to the Ground truth (S->G)
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Comparing Hierarchies (saliencies) with Precision-recall similarity measures
UCM Cousty (floodings of watershed)
UCM random hierarchy Cousty random hierarchy
GT6 GT5 GT4 GT3 GT2 GT7 GT1 20 Barcelona June 2013
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Comparing Hierarchies (saliencies) with Precision-recall similarity measures
Image 25098
UCM UCM random
Cousty Cousty random
Precision energy
4.4 0.27 0.13 0.09
Recall energy
3.9 0.28 0.16 0.10
Integrals from PR equations expressed per 1000 pixels in the image
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Problem context
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Ground truth: Evaluation of Hierarchies
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A problem: Transforming hierarchies
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Representations of Hierarchies: Saliency function
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Saliency Ultrametric contour Map (UCM)
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Introducing an external function
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Introducing an external function
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Introducing an external function
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Binary Class Opening
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Numerical (grayscale) class opening
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Example: Class Opening
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Properties of class opening I
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Properties of class opening II
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Saliency degeneracy
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1 2 3 4 5 6 7 8 9 100
2
4
6
8
10
12
14
16
18
20
linear
power law x > 1 (compression)
power law x 0 < < 1(expansion)
Logarithmic
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Evaluating Hierarchies w.r.t Ground Truth
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Evaluating Hierarchies w.r.t Ground Truth
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Composing two external functions
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Composing two external functions
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Generating Random Hierarchies
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Hierarchy Fusion: Matching hierarchies
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Hierarchy Fusion: Matching hierarchies
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Hierarchy Fusion: Matching hierarchies
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Hierarchy Fusion: Matching hierarchies
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Conclusion
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http://www.esiee.fr/~kiranr/HierarchEvalGT.html
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Future work
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