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Towards Detecting Changes in Underwater Image Sequences

Detecting changes between images of the same scene taken at different times is of great interest for monitoring and understanding the environment. It is widely used for on-land application but suffers from different constraints. Unfortunately, Change detection algorithms require highly accurate geometric and photometric registration. This requirement has precluded their use in underwater imagery in the past. In this paper, the change detection techniques available nowadays for on-land application were analyzed and a method to automatically detect the changes in sequences of underwater images is proposed. Target application scenarios are habitat restoration sites, or area monitoring after sudden impacts from hurricanes or ship groundings. The method is based on the creation of a 3D terrain model from one image sequence over an area of interest. This model allows for synthesizing textured views that correspond to the same viewpoints of a second image sequence. The generated views are photometrically matched and corrected against the corresponding frames from the second sequence. Standard change detection techniques are then applied to find areas of difference. Additionally, the paper shows that it is possible to detect false positives, resulting from non-rigid objects, by applying the same change detection method to the first sequence exclusively. The developed method was able to correctly find the changes between two challenging sequences of images from a coral reef taken one year apart and acquired with two different cameras

© OCEANS 2008 - MTS/IEEE Kobe Techno-Ocean, 2008, p. 1-8

IEEE

Autor: Delaunoy, Olivier
Grácias, Nuno Ricardo Estrela
García Campos, Rafael
Data: 2008
Resum: Detecting changes between images of the same scene taken at different times is of great interest for monitoring and understanding the environment. It is widely used for on-land application but suffers from different constraints. Unfortunately, Change detection algorithms require highly accurate geometric and photometric registration. This requirement has precluded their use in underwater imagery in the past. In this paper, the change detection techniques available nowadays for on-land application were analyzed and a method to automatically detect the changes in sequences of underwater images is proposed. Target application scenarios are habitat restoration sites, or area monitoring after sudden impacts from hurricanes or ship groundings. The method is based on the creation of a 3D terrain model from one image sequence over an area of interest. This model allows for synthesizing textured views that correspond to the same viewpoints of a second image sequence. The generated views are photometrically matched and corrected against the corresponding frames from the second sequence. Standard change detection techniques are then applied to find areas of difference. Additionally, the paper shows that it is possible to detect false positives, resulting from non-rigid objects, by applying the same change detection method to the first sequence exclusively. The developed method was able to correctly find the changes between two challenging sequences of images from a coral reef taken one year apart and acquired with two different cameras
Format: application/pdf
Cita: Delaunoy, O., Gracias, N., i Garcia, R. (2008). Towards Detecting Changes in Underwater Image Sequences. OCEANS 2008 - MTS/IEEE Kobe Techno-Ocean, 1 - 8. Recuperat 06 maig 2010, a http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4531004
ISBN: 978-1-4244-2125-1
Accés al document: http://hdl.handle.net/10256/2177
Llenguatge: eng
Editor: IEEE
Col·lecció: Reproducció digital del document publicat a: http://dx.doi.org/10.1109/OCEANSKOBE.2008.4531004
Articles publicats (D-ATC)
És part de: © OCEANS 2008 - MTS/IEEE Kobe Techno-Ocean, 2008, p. 1-8
Drets: Tots els drets reservats
Matèria: Imatge, Tècniques d’
Imatgeria tridimensional
Teledetecció
Imaging systems
Remote sensing
Three-dimensional imaging
Títol: Towards Detecting Changes in Underwater Image Sequences
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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