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Colour Correction of Underwater Images Using Spectral Data
Uppsala universitet, Fakultetsövergripande enheter, Centrum för bildanalys.
2005 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

For marine sciences sometimes there is a need to perform underwater photography. Optical properties of light cause severe quality problems for underwater photography. Light of different energies is absorbed at highly different rates under water causing significant bluishness of the images. If the colour dependent attenuation under water can be properly estimated it should be possible to use computerised image processing to colour correct digital images using Beer’s Law.

In this thesis we have developed such estimation and correction methods that have become progressively more complicated and more accurate giving successively better correction results. A process of estimation of downwelling attenuation coefficients from multi or hyper spectral data is a basis for automatic colour restoration of underwater taken images. The results indicate that for each diving site the unique and precise coefficients can be obtained.

All standard digital cameras have built in white balancing and colour enhancement functions designed to make the images as aesthetically pleasing as possible. These functions can in most cameras not be switched off and the algorithms used are proprietary and undocumented. However, these enhancement functions can be estimated. Applying their reverse creates un-enhanced images and we show that our algorithms for underwater colour correction works significantly better when applied to such images.

Finally, we have developed a method that uses point spectra from the spectrometer together with RGB colour images from a camera to generate pseudo-hyper-spectral images. Each of these can then be colour corrected. Finally, the images can be weighted together in the proportions needed to create new correct RGB images. This method is somewhat computationally demanding but gives very encouraging results.

The algorithms and applications presented in this thesis show that automatic colour correction of underwater images can increase the credibility of data taken underwater for marine scientific purposes.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis , 2005. , s. x+55
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 120
Nyckelord [en]
Bildanalys, Colour, Correction, Attenuation, Coefficient, Underwater
Nyckelord [sv]
Bildanalys
Nationell ämneskategori
Datorseende och robotik (autonoma system)
Identifikatorer
URN: urn:nbn:se:uu:diva-6138ISBN: 91-554-6403-3 (tryckt)OAI: oai:DiVA.org:uu-6138DiVA, id: diva2:167349
Disputation
2005-12-16, Polhemsalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 09:15
Opponent
Handledare
Tillgänglig från: 2005-11-25 Skapad: 2005-11-25 Senast uppdaterad: 2018-01-13Bibliografiskt granskad
Delarbeten
1. Color Correction of Underwater Images Based on Estimation of Diffuse Attenuation Coefficients
Öppna denna publikation i ny flik eller fönster >>Color Correction of Underwater Images Based on Estimation of Diffuse Attenuation Coefficients
2003 Ingår i: Proceedings of the PICS 2003: The PICS Conference, An International Technical Conference on The Science and Systems of Digital Photography, including the Fifth International Symposium on Multispectral Color Science, ISSN 0-89208-245-3, s. 325-329Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-93762 (URN)
Tillgänglig från: 2005-11-25 Skapad: 2005-11-25Bibliografiskt granskad
2. Bottom Reflectance Influence on a Color Correction Algorithm for Underwater Images
Öppna denna publikation i ny flik eller fönster >>Bottom Reflectance Influence on a Color Correction Algorithm for Underwater Images
2003 (Engelska)Ingår i: Lecture Notes in Computer Science. Proceedings of the 13th Scandinavian Conference on Image Analysis (SCIA), ISSN 0302-9743, Vol. 2749, s. 922-926Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-93763 (URN)
Tillgänglig från: 2005-11-25 Skapad: 2005-11-25 Senast uppdaterad: 2010-03-01Bibliografiskt granskad
3. Improvement of a Color Correction Algorithm for Underwater Images Through Compensating for Digital Camera Behaviour
Öppna denna publikation i ny flik eller fönster >>Improvement of a Color Correction Algorithm for Underwater Images Through Compensating for Digital Camera Behaviour
2004 (Engelska)Ingår i: Proceedings of the Swedish Symposium on Image Analysis, s. 142-145Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-93764 (URN)
Tillgänglig från: 2005-11-25 Skapad: 2005-11-25 Senast uppdaterad: 2010-03-01Bibliografiskt granskad
4. Pre-Processing of Underwater Images Taken in Shallow Water for Color Reconstruction Purposes
Öppna denna publikation i ny flik eller fönster >>Pre-Processing of Underwater Images Taken in Shallow Water for Color Reconstruction Purposes
2005 (Engelska)Ingår i: Proceedings of the 7th IASTED International Conference on Signal and Image ProcessingArtikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-93765 (URN)
Tillgänglig från: 2005-11-25 Skapad: 2005-11-25 Senast uppdaterad: 2010-03-01Bibliografiskt granskad
5. Dissolved Organic Matters Impact on Colour Reconstruction in Underwater Images
Öppna denna publikation i ny flik eller fönster >>Dissolved Organic Matters Impact on Colour Reconstruction in Underwater Images
2005 (Engelska)Ingår i: Lecture Notes in Computer Science. Proceedings of the 14th Scandinavian Conference on Image Analysis, ISSN 3-540-26320-9, Vol. 3540, s. 1148-1156Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-93766 (URN)
Tillgänglig från: 2005-11-25 Skapad: 2005-11-25 Senast uppdaterad: 2010-03-01Bibliografiskt granskad
6. Evaluation of Underwater Spectral Data for Colour Correction Applications
Öppna denna publikation i ny flik eller fönster >>Evaluation of Underwater Spectral Data for Colour Correction Applications
(Engelska)Artikel i tidskrift (Refereegranskat) Submitted
Identifikatorer
urn:nbn:se:uu:diva-93767 (URN)
Tillgänglig från: 2005-11-25 Skapad: 2005-11-25 Senast uppdaterad: 2010-03-01Bibliografiskt granskad
7. Application of Underwater Spectral Data for Colour Correction Purposes
Öppna denna publikation i ny flik eller fönster >>Application of Underwater Spectral Data for Colour Correction Purposes
(Engelska)Artikel i tidskrift (Refereegranskat) Submitted
Identifikatorer
urn:nbn:se:uu:diva-93768 (URN)
Tillgänglig från: 2005-11-25 Skapad: 2005-11-25 Senast uppdaterad: 2010-03-01Bibliografiskt granskad

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