Fritz Albregtsen

Image of Fritz Albregtsen
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Phone +47-22852463
Mobile phone +47-91163005
Room 4459
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Visiting address Gaustadalléen 23B Ole-Johan Dahls hus 0373 OSLO
Postal address Postboks 1080 Blindern 0316 OSLO
Other affiliations Department for Informatics

Academic Interests

My research is mainly focused on medical image analysis. The primary aim is to provide robust prognosis for human cancers, using quantitative image analysis. This work is done together with Master- and PhD-students and colleagues at the Norwegian Radium Hospital. Input data are digital microscopy images of cell nuclei from clinical patient materials covering a number of cancer types. Here we try to find compact and reliable sets of superior textural features for human cancer prognosis within a high-dimensional set of possible feature candidates, thus facilitating a more focused and better treatment of cancer patients.

Another aspect of this effort is the very important step of automatic segmentation of medical images, e.g. cell nuclei, in order to facilitate the high-resolution, high-throughput automatic texture analysis of cell nuclei. This in turn necessitates some focus on methods for quantitative evaluation of segmentation results.

In addition, I work on quantitative metrics for image quality, together with PhD-students and colleagues at Gjøvik University College.

Teaching

Tags: Image analysis, texture analysis, medical applications, quality metrics

Publications

  • Holmen, Sigve; Galappaththi-Arachchige, Hashini Nilushika; Kleppa, Elisabeth; Pillay, Pavitra; Naicker, Thajasvarie; Taylor, Myra; Onsrud, Mathias; Kjetland, Eyrun Floerecke & Albregtsen, Fritz (2016). Characteristics of Blood Vessels in Female Genital Schistosomiasis: Paving the Way for Objective Diagnostics at the Point of Care. PLoS Neglected Tropical Diseases.  ISSN 1935-2727.  10(4) . doi: 10.1371/journal.pntd.0004628
  • Hveem, Tarjei Sveinsgjerd; Kleppe, Andreas; Vlatkovic, Ljiljana; Ersvær, Elin; Wæhre, Haakon; Nielsen, Birgitte; Kjær, Marte Avranden; Pradhan, Manohar; Syvertsen, Rolf Anders; Nesheim, John Arne; Liestøl, Knut; Albregtsen, Fritz & Danielsen, Håvard Emil (2016). Chromatin changes predict recurrence after radical prostatectomy. British Journal of Cancer.  ISSN 0007-0920.  114(11), s 1243- 1250 . doi: 10.1038/bjc.2016.96
  • Hveem, Tarjei Sveinsgjerd; Njølstad, Tormund Salvesen; Nielsen, Birgitte; Syvertsen, Rolf Anders; Nesheim, John Arne; Kjæreng, Marna Lill; Kildal, Wanja; Pradhan, Manohar; Marcickiewicz, Janusz; Tingulstad, Solveig; Staff, Anne Cathrine; Haugland, Hans Kristian; Eraker, Runar; Oddenes, Klaus; Rokne, Jan Anders; Tjugum, Jostein; Lode, Margaret Sævik; Amant, Frédéric; Werner, Henrica Maria Johanna; Bjørge, Line; Albregtsen, Fritz; Liestøl, Knut; Salvesen, Helga; Trovik, Jone & Danielsen, Håvard Emil (2016). Changes in Chromatin Structure in Curettage Specimens Identifies High-Risk Patients in Endometrial Cancer. Cancer Epidemiology, Biomarkers and Prevention.  ISSN 1055-9965.  26(1), s 61- 67 . doi: 10.1158/1055-9965.EPI-16-0215
  • Holmen, Sigve; Kjetland, Eyrun Floerecke; Taylor, Myra; Kleppa, Elisabeth; Lillebø, Kristine; Gundersen, Svein Gunnar; Onsrud, Mathias & Albregtsen, Fritz (2015). Colourimetric image analysis as a diagnostic tool in female genital schistosomiasis . Medical Engineering and Physics.  ISSN 1350-4533.  37(3), s 309- 314 . doi: 10.1016/j.medengphy.2014.12.007
  • Holmen, Sigve; Kleppa, Elisabeth; Lillebø, Kristine; Pillay, Pavitra; Van Lieshout, Lisette; Taylor, Myra; Albregtsen, Fritz; Vennervald, Birgitte Jyding; Onsrud, Mathias & Kjetland, Eyrun Floerecke (2015). The first step toward diagnosing female genital schistosomiasis by computer image analysis . American Journal of Tropical Medicine and Hygiene.  ISSN 0002-9637.  93(1), s 80- 86 . doi: 10.4269/ajtmh.15-0071
  • Kumar, Rahul Prasanna; Albregtsen, Fritz; Reimers, Martin; Edwin, Bjørn; Langø, Thomas & Elle, Ole Jakob (2015). Blood vessel segmentation and centerline tracking using local structure analysis. International Federation for Medical and Biological Engineering Proceedings.  ISSN 1680-0737.  45, s 122- 125 . doi: 10.1007/978-3-319-11128-5_31
  • Kumar, Rahul Prasanna; Albregtsen, Fritz; Reimers, Martin; Edwin, Bjørn; Langø, Thomas & Elle, Ole Jakob (2015). Three-Dimensional Blood Vessel Segmentation and Centerline Extraction based on Two-Dimensional Cross-Section Analysis. Annals of Biomedical Engineering.  ISSN 0090-6964.  43(5), s 1223- 1234 . doi: 10.1007/s10439-014-1184-4
  • Landmark, Knut; Solberg, Anne H Schistad; Albregtsen, Fritz; Austeng, Andreas & Hansen, Roy Edgar (2015). A Radon-Transform-Based Image Noise Filter - With Applications to Multibeam Bathymetry. IEEE Transactions on Geoscience and Remote Sensing.  ISSN 0196-2892.  53(11), s 6252- 6273 . doi: 10.1109/TGRS.2015.2436380
  • Nielsen, Birgitte; Hveem, Tarjei Sveinsgjerd; Kildal, Wanja; Abeler, Vera Maria; Kristensen, Gunnar S Balle; Albregtsen, Fritz & Danielsen, Håvard Emil (2015). Entropy-based adaptive nuclear texture features are independent prognostic markers in a total population of uterine sarcomas. Cytometry Part A.  ISSN 1552-4922.  87(4), s 315- 325 . doi: 10.1002/cyto.a.22601
  • Simone, Gabriele; Audino, Giuseppe; Farup, Ivar; Albregtsen, Fritz & Rizzi, Alessandro (2014). Termite retinex: A new implementation based on a colony of intelligent agents. Journal of Electronic Imaging (JEI).  ISSN 1017-9909.  23(1) . doi: 10.1117/1.JEI.23.1.013006 Full text in Research Archive
  • Kumar, Rahul Prasanna; Albregtsen, Fritz; Reimers, Martin; Langø, Thomas; Edwin, Bjørn & Elle, Ole Jakob (2013). 3D multiscale vessel enhancement based centerline extraction of blood vessels, In Sebastien Ourselin & David Haynor (ed.),  SPIE Medical Imaging 2013: Image Processing.  SPIE - International Society for Optical Engineering.  ISBN 978-08-194-9443-6.  KAPITTEL.
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard Emil (2012). Automatic segmentation of cell nuclei in Feulgen-stained histological sections of prostate cancer and quantitative evaluation of segmentation results. Cytometry.  ISSN 0196-4763.  81A(7), s 588- 601 . doi: 10.1002/cyto.a.22068
  • Nielsen, Birgitte; Albregtsen, Fritz; Kildal, Wanja; Abeler, Vera Maria; Kristensen, Gunnar S Balle & Danielsen, Håvard Emil (2012). The prognostic value of adaptive nuclear texture features from patient gray level entropy matrices in early stage ovarian cancer. Analytical Cellular Pathology.  ISSN 2210-7185.  35(4), s 305- 314 . doi: 10.3233/ACP-2012-0065
  • Dunn, J. M.; Hveem, Tarjei Sveinsgjerd; Pretorius, Mikkel; Oukrif, D.; Nielsen, Birgitte; Albregtsen, Fritz; Lovat, L. B.; Novelli, M. R. & Danielsen, Håvard Emil (2011). Comparison of nuclear texture analysis and image cytometric DNA analysis for the assessment of dysplasia in Barrett's oesophagus. British Journal of Cancer.  ISSN 0007-0920.  105(8), s 1218- 1223 . doi: 10.1038/bjc.2011.353
  • Nussbaum, Peter Stefan; Hardeberg, Jon Yngve & Albregtsen, Fritz (2011). Regression based characterization of color measurement instruments in printing applications. Proceedings of SPIE, the International Society for Optical Engineering.  ISSN 0277-786X.  7866 . doi: 10.1117/12.872381
  • Pedersen, Marius; Bonnier, Nicolas; Hardeberg, Jon Yngve & Albregtsen, Fritz (2011). Image quality metrics for the evaluation of print quality . Proceedings of SPIE, the International Society for Optical Engineering.  ISSN 0277-786X.  7867 . doi: 10.1117/12.876472
  • Akbari, Akbar; Albregtsen, Fritz & Jakobsen, Kjetill Sigurd (2010). Automatic lane detection and separation in one dimensional gel images using continuous wavelet transform. Analytical Methods.  ISSN 1759-9660.  2(9), s 1360- 1371 . doi: 10.1039/c0ay00167h
  • Pedersen, Marius; Bonnier, Nicolas; Hardeberg, Jon Yngve & Albregtsen, Fritz (2010). Attributes of image quality for color prints . Journal of Electronic Imaging (JEI).  ISSN 1017-9909.  19(1) . doi: 10.1117/1.3277145
  • Pedersen, Marius; Bonnier, Nicolas; Hardeberg, Jon Yngve & Albregtsen, Fritz (2010). Estimating print quality attributes by image quality metrics, In . NN (ed.),  Eighteenth Color Imaging Conference : Color Science and Engineering Systems, Technologies and Applications ; Final program and proceedings, November 8 - 12, 2010, San Antonio, Texas / sponsored by Society for Imaging Science and Technology and Society for Information Display.  The Society for Imaging Science and Technology.  ISBN 978-0-89208-294-0.  Article.  s 68 - 73
  • Pedersen, Marius; Bonnier, Nicolas; Hardeberg, Jon Yngve & Albregtsen, Fritz (2010). Validation of quality attributes for evaluation of color prints, In . NN (ed.),  Eighteenth Color Imaging Conference : Color Science and Engineering Systems, Technologies and Applications ; Final program and proceedings, November 8 - 12, 2010, San Antonio, Texas / sponsored by Society for Imaging Science and Technology and Society for Information Display.  The Society for Imaging Science and Technology.  ISBN 978-0-89208-294-0.  s 74 - 79
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard Emil (2009). Statistical Nuclear Texture Analysis in Cancer Research: A Review of Methods and Applications . Critical reviews in oncogenesis.  ISSN 0893-9675.  14(2-3), s 89- 164
  • Pedersen, Marius; Albregtsen, Fritz & Hardeberg, Jon Yngve (2009). Detection of worms in error diffusion halftoning . Proceedings of SPIE, the International Society for Optical Engineering.  ISSN 0277-786X.  (7242)
  • Pedersen, Marius; Albregtsen, Fritz & Hardeberg, Jon Yngve (2009). Detection of worms in error diffusion halftoning , In Susan P. Farnand & Frans Gaykema (ed.),  Image quality and system performance VI 19-21 January 2009, San Jose, California, USA.  SPIE - International Society for Optical Engineering.  ISBN 9780819474926.  Kapittel.
  • Pedersen, Marius; Bonnier, Nicolas; Hardeberg, Jon Yngve & Albregtsen, Fritz (2009). Attributes of a New Image Quality Model for Color Prints , In N N (ed.),  Seventeenth Color Imaging Conference: Color Science and Engineering Systems, Technologies, and Applications; Final Program and Proceedings.  The Society for Imaging Science and Technology.  ISBN 9780892082889.  Kapittel.  s 204 - 209
  • Akbari, Akbar; Marthinsen, Gunnhild; Lifjeld, Jan Terje; Albregtsen, Fritz; Wennerberg, Liv; Stenseth, Nils Christian & Jakobsen, Kjetill Sigurd (2008). Improved DNA fragment length estimation in capillary electrophoresis. Electrophoresis.  ISSN 0173-0835.  29(6), s 1273- 1285 . doi: 10.1002/elps.200700523
  • Cvancarova, Milada; Albregtsen, Fritz; Brabrand, Knut & Samset, Eigil (2005). Segmentation of ultrasound images of liver tumors applying snake algorithms and GVF. Excerpta Medica: International Congress Series.  ISSN 0531-5131.  (1281), s 218- 223
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (2005). Fractal analysis of monolayer cell nuclei from two different prognostic classes of early ovarian cancer, In G.A. Losa; T.F. Nonnenmacher & E.R. Weibel (ed.),  Fractals in Biology and Medicine.  Birkhäuser Verlag.  ISBN 3-7643-7172-2.  contributed paper.  s 175 - 186
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard Emil (2004). Low dimensional adaptive texture feature vectors from class distance and class difference matrices. IEEE Transactions on Medical Imaging.  ISSN 0278-0062.  23, s 73- 84
  • Schulerud, Helene & Albregtsen, Fritz (2004). Many are called, but few are chosen. Feature selection and error estimation in high dimensional spaces. Computer Methods and Programs in Biomedicine.  ISSN 0169-2607.  73, s 91- 99
  • Albregtsen, Fritz; Nielsen, Birgitte & Danielsen, Håvard E. (2003). Cancer Diagnostics and Prognostics by Low Dimensional Adaptive Texture Features from Fractal Signature and Lacunarity Matrices, In V. Capasso (ed.),  Mathematical Modelling & Computing in Biology and Medicine.  Milan Research Centre for Industrial and Applied Mathematics.  ISBN 88-7488-055-3.  Shape and Patterns.  s 511 - 517
  • Akbari, Akbar & Albregtsen, Fritz (2003). Normalizing the background and removing the trend in one-dimensional DNA fingerprint images. Journal of Chromatography A.  ISSN 0021-9673.  1014, s 11- 19
  • Akbari, Akbar; Albregtsen, Fritz & Lingjærde, Ole Christian (2002). Adaptive weighted least squares method for estimation of DNA fragment lenghts from agaros gels. Electrophoresis.  ISSN 0173-0835.  23(2), s 176- 181
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (2002). Fractal signature vectors and lacunarity class distance matrices to extract new adaptive texture features from cell nuclei. Mathematics and bioscience in interaction. Fractals in biology and medicine.  3, s 55- 65
  • Schulerud, Helene & Albregtsen, Fritz (2002). Effects of many feature candidates in feature selection and classification, In  Lecture Notes in Computer Science.   artikkel.  s 480 - 487
  • Nielsen, Birgitte; Albregtsen, Fritz; Kildal, Wanja & Danielsen, Håvard E. (2001). Prognostic classification of early ovarian cancer based on very low dimensionality adaptive texture feature vectors from cell nuclei from monolayers and histological sections. Analytical Cellular Pathology.  ISSN 0921-8912.  23, s 75- 88
  • Albregtsen, Fritz & Nielsen, Birgitte (2000). Texture classification based on cooccurrence of gray level run length matrices. Australian Journal of Intelligent Information Processing Systems.  ISSN 1321-2133.  6(1), s 38- 45
  • Baheerathan, Sivalingam; Albregtsen, Fritz & Danielsen, Håvard E. (1999). New texture features based on the complexity curve. Pattern Recognition.  ISSN 0031-3203.  32, s 605- 618
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (1999). The use of Fractal Features from the Periphery of Cell Nuclei as a Classification Tool. Analytical Cellular Pathology.  ISSN 0921-8912.  19(1), s 21- 37
  • Baheerathan, Sivalingam; Albregtsen, Fritz & Danielsen, Håvard E. (1998). Registration of serial sections of mouse liver cell nuclei. Journal of Microscopy.  ISSN 0022-2720.  192, s 37- 53
  • Kristensen, Gunnar B.; Liestøl, Knut; Vlatkovic, L.; Reith, Albrecht; Albregtsen, Fritz & Danielsen, Håvard E. (1998). A review of caveats in statistical nuclear image analysis. Analytical Cellular Pathology.  ISSN 0921-8912.  16, s 63- 82
  • Yogesan, Kanagasingam; Schulerud, Helene; Albregtsen, Fritz & Danielsen, Håvard E. (1998). Ultrastrctural texture analysis as a diagnostic tool in mouse liver carcinogenesis. Ultrastructural Pathology.  ISSN 0191-3123.  (22(1)), s 27- 37
  • Yang, Luren; Albregtsen, Fritz & Taxt, Torfinn (1997). Fast computation of three-dimensional geometric moments using a discrete divergence theorem and a generalization to higher dimensions. Graphical Models and Image Processing.  ISSN 1077-3169.  59(2), s 97- 108
  • Yang, Luren & Albregtsen, Fritz (1996). Fast and exact computation of Cartesian geometric moments using discrete Green's theorem. Pattern Recognition.  ISSN 0031-3203.  29(7), s 1061- 1073
  • Yogesan, Kanagasingam; Jørgensen, Trond; Albregtsen, Fritz; Tveter, Kjell & Danielsen, Håvard E. (1996). Entropy-based texture analysis of chromatin structure in advanced prostate cancer. Cytometry.  ISSN 0196-4763.  24, s 268- 276
  • Albregtsen, Fritz; Schulerud, Helene & Yang, Luren (1995). Texture classification of mouce liver cell nuclei using invariant moments of consistent regions, In V Hlavac & R Sara (ed.),  Lecture Notes in Computer Science.   artikkel.  s 496 - 502
  • Yang, Luren; Albregtsen, Fritz; Lønnestad, T; Grøttum, Per; Iversen, Jens Gustav; Røtnes, Jan Sigurd & Røttingen, John-Arne (1995). Measuring shape and motion of white blood cells from a sequence of fluorescence microscopy images, I: G Borgefors (red.),  Theory and applications of image analysis II.  World Scientific, Singapore.  s 305 - 316

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  • Albregtsen, Fritz & Skagestein, Gerhard (2007). Digital representasjon av tekster, tall, former, lyd, bilder og video, 2. utgave. Unipub forlag.  ISBN 978-82-7477-318-9.  387 s.
  • Albregtsen, Fritz & Skagestein, Gerhard (2006). Digital representasjon av tekster, tall, former, lyd, bilder og video. Unipub forlag.  ISBN 82-7477-265-2.  387 s.

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  • Holmen, Sigve Dhondup; Kleppa, Elisabeth; Lillebø, Kristine; Moodley, Jayeshnee; Taylor, Myra; Albregtsen, Fritz; Vennervald, Birgitte J.; Onsrud, Mathias & Kjetland, Eyrun Flørecke (2013). A Novel, Diagnostic Tool for Female Genital Schistosomiasis in Low-Resource Settings.
  • Holmen, Sigve Dhondup; Kleppa, Elisabeth; Lillebø, Kristine; Taylor, M.; Albregtsen, Fritz & Kjetland, Eyrun Floerecke (2013). Diagnosing female genital schistosomiasis. Tropical medicine & international health.  ISSN 1360-2276.  18, s 56- 56
  • Holmen, Sigve Dhondup; Kleppa, Elisabeth; Lillebø, Kristine; Taylor, Myra; Albregtsen, Fritz & Kjetland, Eyrun Flørecke (2013). Diagnosing Female Genital Schistosomiasis.
  • Kumar, Rahul Prasanna; Albregtsen, Fritz; Reimers, Martin; Edwin, Bjørn & Elle, Ole Jakob (2013). Novel blood vessel segmentation method.
  • Kumar, Rahul Prasanna; Albregtsen, Fritz; Reimers, Martin; Langø, Thomas; Edwin, Bjørn & Elle, Ole Jakob (2013). 3D multiscale vessel enhancement based centerline extraction of blood vessels.
  • Holmen, Sigve; Lillebø, Kristine; Kleppa, Elisabeth; Kjetland, Eyrun Flørecke & Albregtsen, Fritz (2012). Computerized image analysis as a tool for identification of clinical manifestations in Female Genital Schistosomiasis.
  • Kumar, Rahul Prasanna; Albregtsen, Fritz & Elle, Ole Jakob (2012). 3D blood vessel centreline extraction for catheter based navigation.
  • Kumar, Rahul Prasanna; Albregtsen, Fritz; Reimers, Martin; Langø, Thomas & Elle, Ole Jakob (2012). A faster centreline tracking of blood vessels.
  • Dunn, J. M.; Lovat, L. B.; Pretorius, M; Oukrif, D.; Hveem, Tordis; Nielsen, Bettina; Albregtsen, Fritz; Novelli, M. R. & Danielsen, Håvard Emil (2010). COMBINATION OF NUCLEAR TEXTURAL ANALYSIS AND IMAGE CYTOMETRIC DNA ANALYSIS IS MORE ACCURATE THAN IMAGE CYTOMETRIC DNA PLOIDY ANALYSIS ALONE FOR RISK STRATIFICATION IN BARRETT'S OESOPHAGUS. Gut.  ISSN 0017-5749.  59, s A114- A115 . doi: 10.1136/gut.2009.208983r
  • Nielsen, B; Albregtsen, Fritz & Danielsen, Håvard Emil (2010). AUTOMATIC SEGMENTATION OF CELL NUCLEI IN HISTOLOGICAL SECTIONS. Cellular Oncology.  ISSN 1570-5870.  32(3), s 180- 180
  • Albregtsen, Fritz (2009). How to calculate the goodness-of-fit of a fractal dimension . Cellular Oncology.  ISSN 1570-5870.  31(6), s 501- 501 . doi: 10.3233/CLO-2009-0506
  • Nielsen, B; Albregtsen, Fritz & Danielsen, HE (2008). A review of statistical nuclear texture analysis in cancer research. Cellular Oncology.  ISSN 1570-5870.  30, s 165- 165
  • Cvancarova, Milada & Albregtsen, Fritz (2007). Towards a method to compare and evaluate segmentation results of image processing methods applied on medical images. International Journal of Computer Assisted Radiology and Surgery.  ISSN 1861-6410.  2, s 476
  • Cvankarova, Milada; Albregtsen, Fritz; Braband, Knut & Samset, Eigil (2005). Segmentation of ultrasound images of liver tumors applying snake algorithms and GVF.
  • Nielsen, Birgitte & Albregtsen, Fritz (2004). Fractal analysis of monolayer cell nuclei from two different prognostic classes of early ovarian cancer.
  • Akbari, Akbar & Albregtsen, Fritz (2004). Automatic Lane Detection and Separation in One Dimensional DNA gel images.
  • Akbari, Akbar & Albregtsen, Fritz (2004). Automatic segmentation of DNA bands in one dimensional gel images produced by hybridizing techniques.
  • Akbari, Akbar & Albregtsen, Fritz (2004). Evaluation of Noise in DNA Fingerprint Images Produced by Hybridization Techniques.
  • Albregtsen, Fritz & Nygreen, Thomas (2003). On the variability of the CCR in ML classification.
  • Baheerathan, Sivalingam; Albregtsen, Fritz; Nielsen, Birgitte & Danielsen, Håvard E. (2003). Complexity graylevel matrix - a new texture analysis method.
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (2003). Local binary pattern matrix - a new approach to nuclear texture analysis.
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (2003). Nuclear texture analysis of two different prognostic classes of early ovarian cancer based on gray level entropy matrices.
  • Albregtsen, Fritz & Schulerud, Helene (2003). Leave-one-out classification error estimation in high dimensional feature spaces - the usual way, and the right way.
  • Akbari, Akbar & Albregtsen, Fritz (2002). Normalizing Background Trend in One-Dimensional DNA Fingerprint Images.
  • Albregtsen, Fritz & Nielsen, Birgitte (2002). Adaptive low dimensional texture features from fractal signature vectors and lacunarity matrices.
  • Albregtsen, Fritz; Nielsen, Birgitte & Danielsen, Håvard E. (2002). A compact set of adaptive features from cooccurrence of gray level run length matrices.
  • Albregtsen, Fritz; Nielsen, Birgitte & Danielsen, Håvard E. (2002). Computing adaptive fractal features from gray level images of cell nuclei.
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (2002). Statistical texture analysis - robustness versus number of gray levels.
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (2002). Transforming 2D images to 1D signals to obtain radially differentiated fractal features from early ovarian cancer cell nuclei.
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (2002). Two adaptive texture features based on multidimensional gray level cooccurrence marices.
  • Schulerud, Helene & Albregtsen, Fritz (2002). Effects of many feature candidates in feature selection and classification.
  • Akbari, Akbar & Albregtsen, Fritz (2001). BACKGROUND NORMALIZATION OF DNA FINGERPRINT IMAGES.
  • Akbari, Akbar; Albregtsen, Fritz & Lingjærde, Ole Christian (2001). ADAPTIVE WEIGHTED LEAST SQUARES METHOD FOR ESTIMATION OF DNA FRAGMENT LENGHTS FROM AGAROS GELS.
  • Albregtsen, Fritz; Nielsen, Birgitte & Danielsen, Håvard E. (2001). A unified approach to low dimensionality adaptive texture feature extraction applied to ovarian cancer prognosis estimation.
  • Nielsen, Birgitte; Albregtsen, Fritz; Kildal, Wanja & Danielsen, Håvard E. (2001). The extraction of low dimensionality adaptive texture feature vectors from the periphery and center of ovarian cell nuclei from monolayers and histological sections.
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (2000). Using fractal signature vectors and lacunarity distance matrices to extract new adaptive features from cell nuclei.
  • Albregtsen, Fritz; Nielsen, Birgitte & Danielsen, Håvard E. (2000). Adaptive gray level run length features obtained from class distance matrices.
  • Albregtsen, Fritz; Nielsen, Birgitte & Danielsen, Håvard E. (2000). Adaptive gray level run length features obtained from class distance matrices.
  • Nielsen, Birgitte; Albregtsen, Fritz; Baheerathan, Sivalingam & Danielsen, Håvard E. (2000). Peel-off-scanning to obtain radial differentiation of fractal and complexity features in cell nuclei.
  • Nielsen, Birgitte; Albregtsen, Fritz; Baheerathan, Sivalingam & Danielsen, Håvard E. (2000). Peel-off-scanning to obtain radial differentiation of fractal and complexity features in cell nuclei.
  • Nielsen, Birgitte; Albregtsen, Fritz & Danielsen, Håvard E. (1999). Diagnostic classification based on fractal features in the periphery of cell nuclei from liver lesions.
  • Yang, Luren; Albregtsen, Fritz; Lønnestad, Tor; Grøttum, Per & Borgefors, Gunilla (1999). Measuring shape and motion of white blood cells from sequences of fluorescence microskopy.
  • Schulerud, Helene; Kristensen, Gunnar B.; Albregtsen, Fritz; Liestøl, Knut & Danielsen, Håvard E. (1997). Prognosis of cervix cancer.
  • Schulerud, Helene; Kristensen, Gunnar B.; Albregtsen, Fritz; Liestøl, Knut & Danielsen, Håvard E. (1996). Prognosis of cervix cancer using texture analysis.
  • Yang, Luren; Albregtsen, Fritz; Lønnestad, Tor; Grøttum, Per; Hlavác, Václav & Sára, Radim (1996). A supervised approach to the evaluation of image segmentation methods.

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Published Nov. 4, 2010 1:44 PM - Last modified Jan. 6, 2014 11:53 AM

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