CVPR2010: Context-aware saliency detection
Transcript of CVPR2010: Context-aware saliency detection
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Olympic weight lifter Olympic victory Olympic
achievement
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Olympic weight lifter Olympic victory Olympic
achievement
Description based on “salient” pixels only
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Itti & Koch, 2001Bruce Tsotsos, 2009Judd et al., 2009Previous talk of the session
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Liu et al, 2007
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Grab-Cut, Rother et al., 2004
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Our goal: Convey the image content
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Stas GofermanLihi Zelnik-ManorAyellet Tal
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1. Principles for context-aware saliency
2. A saliency detection algorithm
3. Applications:• Image retargeting
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1. Principles for context-aware saliency
2. A saliency detection algorithm
3. Applications:• Image retargeting• Collages
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Following perceptual properties
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Local low-level factors• Contrast• Color• …
Walther & Koch, 2006
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Global considerations• Maintain unique features
Hou & Zhang, 2007
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Local & global• Should be multi-scale
Liu et al, 2007
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Visual organization (Gestalt)• Few centers of gravity• Position is important!!
Our foci
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High-level• Faces• Objects• People• …
Judd et al, 2009
Low-level
With face detection
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Our result
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Our result
LocalWalther & Koch, 2006
GlobalHou & Zhang, 2007
Local + globalLiu et al, 2007
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The steps of our algorithm
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Principles 1-2:Unique appearance salient
salient
Not salient
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Principles 1-2:Unique appearance salient
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Principles 1-2:Unique appearance salient
( , )color i jd p p Euclidean distance between colors of patches at pi & pj
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Principles 1-2:Unique appearance salient
high ( , )color i jd p p j
salient
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Principle 3:Position is important!
Similar patches both near and far
Not salient
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Principle 3:Position is important!
Similar patches near
Salient
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Principle 3:Position is important!
( , )position i jd p p Normalized Euclidean distance between positions of pi & pj
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Distance between a pair of patches:
( , )( , )
1 ( , )color i j
i jposition i j
d p pd p p
c d p p
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Distance between a pair of patches:
( , )( , )
1 ( , )color i j
i jposition i j
d p pd p p
c d p p
salient
High j
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Distance between a pair of patches:
( , )( , )
1 ( , )color i j
i jposition i j
d p pd p p
c d p p
salient
High for K most similar
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k
rq K most similar patches at scale r
1
11 exp ( , )
i j
Kr r ri
k
S d p qK
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1
11 exp ( , )
i j
Kr r ri
k
S d p qK
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Salient at:• Multiple scales foreground• Few scales background
1
1 Mrr
i ir r
S SM
Scale 1 Scale 4
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Principle 3:• Few centers of gravity
Context
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Foci =
Include distance map
0.8iS
1 ( )focid i
X
iS
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Realizing Principles 1,2,3 at multiple scales
ˆ 1 ( )i i fociS S d i
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Principle 4:• Faces• Objects• …
Excluded from this talk
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Single-scale saliency
Multiple scales
Final saliency
1
11 exp ( , )
i j
Kr r ri
k
S d p qK
ˆ 1 ( )i i fociS S d i
1
1 Mrr
i ir r
S SM
X
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…
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Walther & Koch, 2006 Hou & Zhang, 2007
Our result
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Walther & Koch, 2006 Hou & Zhang, 2007
Our result
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Walther & Koch, 2006 Hou & Zhang, 2007
Our result
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Walther & Koch, 2006 Hou & Zhang, 2007
Our result
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Walther & Koch, 2006 Hou & Zhang, 2007
Our result
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Walther & Koch, 2006 Hou & Zhang, 2007
Our result
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Database of Hou & Zhang
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Liu et al, 2007
Our result
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Image retargetingCollage
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Seam Carving Our result
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Seam Carving Our result
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Seam Carving Our result
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New definition: Context-aware saliency
Algorithm:Based on 4 perceptual principles
Applications
salient
Not salient
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…