AUTOMATIC SHADOW DETECTION IN AERIAL AND TERRESTRIAL IMAGES
| Autor: | Vander L. S. Freitas, Antonio Maria Garcia Tommaselli, Barbara Maximino da Fonseca Reis |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Computer science
lcsh:Geodesy 0211 other engineering and technologies lcsh:G1-922 02 engineering and technology Shadow Detection Shadow 0202 electrical engineering electronic engineering information engineering Computer vision 021101 geological & geomatics engineering Hue lcsh:QB275-343 Ground truth Pixel business.industry Detecção de Sombras Imagens Terrestres Imagens Aéreas lcsh:Geography. Anthropology. Recreation Terrestrial Images Diffuse sky radiation Filter (signal processing) Aerial Images Object detection lcsh:G General Earth and Planetary Sciences 020201 artificial intelligence & image processing Stage (hydrology) Artificial intelligence business lcsh:Geography (General) |
| Zdroj: | Boletim de Ciências Geodésicas v.23 n.4 2017 Boletim de Ciências Geodésicas Universidade Federal do Paraná (UFPR) instacron:UFPR Boletim de Ciências Geodésicas, Vol 23, Iss 4, Pp 578-590 |
| ISSN: | 1982-2170 1413-4853 |
| DOI: | 10.1590/s1982-21702017000400038 |
| Popis: | Shadows exist in almost all aerial and outdoor images, and they can be useful for estimating Sun position estimation or measuring object size. On the other hand, they represent a problem in processes such as object detection/recognition, image matching, etc., because they may be confused with dark objects and change the image radiometric properties. We address this problem on aerial and outdoor color images in this work. We use a filter to find low intensities as a first step. For outdoor color images, we analyze spectrum ratio properties to refine the detection, and the results are assessed with a dataset containing ground truth. For the aerial case we validate the detections depending of the hue component of pixels. This stage takes into account that, in deep shadows, most pixels have blue or violet wavelengths because of an atmospheric scattering effect. |
| Databáze: | OpenAIRE |
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