Detection and Removal of Chromatic Moving Shadows in Surveillance Scenarios

Ivan Huerta Casado, Michael Boelstoft Holte, Thomas B. Moeslund, Jordi Gonzàlez

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Abstract

 

Segmentation in the surveillance domain has to deal with shadows to avoid distortions when detecting moving objects. Most segmentation approaches dealing with shadow detection are typically restricted to penumbra shadows. Therefore, such techniques cannot cope well with umbra shadows. Consequently, umbra shadows are usually detected as part of moving objects. In this paper we present a novel technique based on gradient and colour models for separating chromatic moving cast shadows from detected moving objects. Firstly, both a chromatic invariant colour cone model and an invariant gradient model are built to perform automatic segmentation while detecting potential shadows.

In a second step, regions corresponding to potential shadows are grouped by considering "a bluish effect" and an edge partitioning.

Lastly, (i) temporal similarities between textures and (ii) spatial similarities between chrominance angle and brightness distortions are analysed for all potential shadow regions in order to finally identify umbra shadows. Unlike other approaches, our method does not make any a-priori assumptions about camera location, surface geometries, surface textures, shapes and types of shadows, objects, and background. Experimental results show the performance and accuracy of our approach in different shadowed materials and illumination conditions.

Original languageEnglish
Title of host publicationInternational Conference on Computer Vision
Number of pages8
PublisherIEEE
Publication date2009
ISBN (Print)9781424444199
Publication statusPublished - 2009
EventInternational Conference on Computer Vision - Kyoto, Japan
Duration: 27 Sept 20094 Oct 2009

Conference

ConferenceInternational Conference on Computer Vision
Country/TerritoryJapan
CityKyoto
Period27/09/200904/10/2009

Keywords

  • Background Subtraction
  • colour segmentation
  • computer vision
  • edge segmentation
  • ICCV 2009
  • image processing
  • motion segmentation
  • shadows
  • temporal difference
  • video surveillance

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