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Pre-processing of underwater images taken in shallow water for color reconstruction purposes
KTH, School of Information and Communication Technology (ICT), Computer and Systems Sciences, DSV.
2005 (English)In: Proc. Seventh IASTED Int. Conf. Sign. Imag. Proc., 2005, 560-564 p.Conference paper (Refereed)
Abstract [en]

Coral reefs are monitored with different techniques in order to examine their health. Digital cameras, which provide an economically defendable tool for marine scientists to collect underwater data, tend to produce bluish images due to severe absorption of light at longer wavelengths. In this paper we study the possibilities of correcting for this color distortion through image processing. The decrease of red light by depth can be predicted by Beer's Law. Another parameter that has been taken into account is the image enhancement functions built into the camera. We use a spectrometer and a reflectance standard to obtain the data needed to approximate the joint effect of these functions. This model is used to pre-process the underwater images taken by digital cameras so that the red, green and blue channels show correct values before the images are subjected to correction for the effects of the water column through application of Beer's Law. This process is fully automatic and the amount of processed images is limited only by the speed of computer system. Experimental results show that the proposed method works well for correcting images taken at different depths with two different cameras.

Place, publisher, year, edition, pages
2005. 560-564 p.
, Proceedings of the Seventh IASTED International Conference on Signal and Image Processing, SIP 2005
Keyword [en]
Color, Correction, Image, Light, Pre-processing, Underwater, Absorption, Functions, Parameter estimation, Reflection, Spectrophotometers, Image reconstruction
National Category
Computer Science
URN: urn:nbn:se:kth:diva-156484ISI: 000233235300105ScopusID: 2-s2.0-33644516300ISBN: 0889865183OAI: diva2:768293
Seventh IASTED International Conference on Signal and Image Processing, SIP 2005, 15-17 August 2005, Honolulu, HI, USA

QC 20141203

Available from: 2014-12-03 Created: 2014-11-28 Last updated: 2014-12-03Bibliographically approved

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Sundgren, David
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