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Automated building detection from satellite images by using shadow information as an object invariant
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index.pdf
Date
2012
Author
Yüksel, Barış
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Apart from classical pattern recognition techniques applied for automated building detection in satellite images, a robust building detection methodology is proposed, where self-supervision data can be automatically extracted from the image by using shadow and its direction as an invariant for building object. In this methodology; first the vegetation, water and shadow regions are detected from a given satellite image and local directional fuzzy landscapes representing the existence of building are generated from the shadow regions using the direction of illumination obtained from image metadata. For each landscape, foreground (building) and background pixels are automatically determined and a bipartitioning is obtained using a graph-based algorithm, Grabcut. Finally, local results are merged to obtain the final building detection result. Considering performance evaluation results, this approach can be seen as a proof of concept that the shadow is an invariant for a building object and promising detection results can be obtained when even a single invariant for an object is used.
Subject Keywords
Image processing
,
Remote-sensing images.
,
Pattern recognition systems.
,
Graph algorithms.
,
Markov random fields.
URI
http://etd.lib.metu.edu.tr/upload/12614909/index.pdf
https://hdl.handle.net/11511/21823
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Graduate School of Natural and Applied Sciences, Thesis
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B. Yüksel, “Automated building detection from satellite images by using shadow information as an object invariant,” M.S. - Master of Science, Middle East Technical University, 2012.
