2. Bridge Extraction Panchromatic Image: High reolution provides detailed descriptions. Challenge: Bridges are surrounded by complex backgrounds. 3.
Related Work 4. Bridge Detection Input Output
5.
River Segmentation ? Water/land segmentation 6.
River Segmentation
Original Image Results 7.
Bridge Extraction Intersection relationship with river flow
8.
Bridge Extraction Constrained Delaunay Triangulation (CDT) 9.
Bridge Extraction River boundary CDT and medial axes 10.
Bridge Extraction Radon transformis used here to avlidate ROI ifparallel lines are detected { ROI is real bridge region } Else { ROI should be neglected } 11. Experiments Extensive experiments are performed on high resolution image gathered from Google earth. However, swells and building shadows cause many false alarms. 12. Future work
13. Acknowledgements Special thanks to Shewchuk for providing the Triangle program Special thanks to anonymous reviewers Special thanks to session chair and audience Thank you 14. Q&A
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