image re-segmentation a new approach applied to urban imagery thales sehn korting leila maria garcia...
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IMAGE RE-SEGMENTATIONA new approach applied to Urban Imagery
Thales Sehn KortingLeila Maria Garcia Fonseca
Luciano Vieira DutraFelipe Castro da Silva
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Introduction
• Image segmentation is the identification of homogeneous regions in the image
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Traditional approaches
• Few versions available for end users
• Algorithms don’t consider the application context– Urban– Agriculture– etc
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Urban Segmentation
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Objective
• Development of a re-segmentation system, based on rectangular shapes
• Re-Segmentation– Rearrangement of a polygon set, merging
some elements to generate objects with particular characteristics, applied to a specific context
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Re-Segmentation Approach
Band 1
Band 2
Band ...Band ...Band ...Band n
Input
Output
Ove
r-S
egm
enta
tion
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Segmentation Based on Graph
• Region Adjacency Graph
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Re-Segmentation Diagram
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Finding Rectangles
Pi
x
y
AV
ANG(Pi)Ri
BOX(Ri)
AREA(Pi)AREA(BOX(Ri))
RET(Pi) =
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Results
• Original image• Rectangular shapes highlighted• Classified regions• Resultant polygons
• Hardware– AMD Athlontm 3000+– 512MB RAM– Linux Mandriva 2006
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1st – Original
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Over-Segmentation
1998 polygons
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Classification
trees
roofs
buildings
streets
others
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Resultant Re-Segmentation
634 polygons
317 seconds
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2nd – Original
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Over-Segmentation
2028 polygons
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Classification
trees
roofs
buildings
streets
others
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Resultant Re-Segmentation
695 polygons
243 seconds
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3rd – Original
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Over-Segmentation
2264 polygons
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Classification
trees
roofs
buildings
streets
others
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Resultant Re-Segmentation
750 polygons
196 seconds
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Drawbacks
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Conclusions
• New approach for image re-segmentation
• Algorithm developed using the Free C++ Library TerraLib (http://www.terralib.org/)
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IMAGE RE-SEGMENTATIONA new approach applied to Urban Imagery
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