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IMAGE RE-SEGMENTATION A new approach applied to Urban Imagery Thales Sehn Korting Leila Maria Garcia Fonseca Luciano Vieira Dutra Felipe Castro da Silva.

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Presentation on theme: "IMAGE RE-SEGMENTATION A new approach applied to Urban Imagery Thales Sehn Korting Leila Maria Garcia Fonseca Luciano Vieira Dutra Felipe Castro da Silva."— Presentation transcript:

1 IMAGE RE-SEGMENTATION A new approach applied to Urban Imagery Thales Sehn Korting Leila Maria Garcia Fonseca Luciano Vieira Dutra Felipe Castro da Silva

2 Introduction Image segmentation is the identification of homogeneous regions in the image

3 Traditional approaches Few versions available for end users Algorithms dont consider the application context –Urban –Agriculture –etc

4 Urban Segmentation

5 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

6 Re-Segmentation Approach Band 1 Band 2 Band... Band n Input Output Over- Segmentation

7 Segmentation Based on Graph Region Adjacency Graph

8 Re-Segmentation Diagram

9 Finding Rectangles PiPi x y AV ANG(P i ) RiRi BOX(R i ) AREA(P i ) AREA(BOX(R i )) RET(P i ) =

10 Results Original image Rectangular shapes highlighted Classified regions Resultant polygons Hardware –AMD Athlon tm –512MB RAM –Linux Mandriva 2006

11 1 st – Original

12 Over-Segmentation 1998 polygons

13 Classification trees roofs buildings streets others

14 Resultant Re-Segmentation 634 polygons 317 seconds

15 2 nd – Original

16 Over-Segmentation 2028 polygons

17 Classification trees roofs buildings streets others

18 Resultant Re-Segmentation 695 polygons 243 seconds

19 3 rd – Original

20 Over-Segmentation 2264 polygons

21 Classification trees roofs buildings streets others

22 Resultant Re-Segmentation 750 polygons 196 seconds

23 Drawbacks

24 Conclusions New approach for image re-segmentation Algorithm developed using the Free C++ Library TerraLib ( )

25 IMAGE RE-SEGMENTATION A new approach applied to Urban Imagery END


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