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Pre-Processing of Underwater Images Taken in Shallow Waters for Color Reconstruction Purposes
Högskolan i Gävle, Institutionen för matematik, natur- och datavetenskap, Ämnesavdelningen för datavetenskap.
Högskolan i Gävle, Institutionen för matematik, natur- och datavetenskap, Ämnesavdelningen för matematik och statistik. (matematik)
2005 (engelsk)Inngår i: Proceedings of the 7th IASTED International Conference on Signal and Image Processing, 2005Konferansepaper, Publicerat paper (Fagfellevurdert)
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 to be 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 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.

sted, utgiver, år, opplag, sider
2005.
Emneord [en]
image, underwater, pre-processing, color, correction, light
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-2452OAI: oai:DiVA.org:hig-2452DiVA, id: diva2:119114
Konferanse
The 7th IASTED International Conference on Signal and Image Processing, Honolulu, Hawaii, USA, August 15-17, 2005
Merknad
On CD-ROM.Tilgjengelig fra: 2008-03-26 Laget: 2008-03-26 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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Åhlén, JuliaSundgren, David

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