KARRAS GEORGE
Last updated 16/12/2019

George Karras
Professor Emeritus

Laboratory of Photogrammetry, Department of Rural & Surveying Engineering
National Technical University of Athens (NTUA)
GR-15780 Athens, Greece
tel. +30 210 7722685, fax: +30 210 7722677
e-mail: gkarras@central.ntua.gr

FAUCCAL
Open Source Software in Matlab for Automatic Camera Calibration

• L. Grammatikopoulos, 2007. Geometric Information from Single Images in Photogrammetry and Computer Vision [in Greek with English abstract].
• I. Kalisperakis, 2010. Epipolar Geometry in Projective and Euclidean Space [in Greek with English abstract].
• A. Prokos, 2012. Development of a Photogrammetric Laser Scanner Using Additional Geometric Constraints [in Greek with English abstract].
  

• Dissertations
  • 1974 An Investigation on the Orientation of the Head in Stereophotogrammetric Studies of Facial Change.  M.Sc. Thesis, Dept. of Surveying, University of Newcastle-upon-Tyne, pp. 175.
  • 1992  Moire Topography as a Method of Close-Range Photogrammetry in Bio­stereometrics. Ph.D. Dissertation, Dept. of Rural & Surveying Engineering, NTUA, pp. 286.
• Books
  • 1995 Current Photogrammetric Practice in Architectural and Archaeological Applications, P.Patias & G.Karras, Thessaloniki, pp. 219 (in Greek).
• Publications in Journals, Books and Proceedings
  • 2019 A semantic 3D point cloud segmentation approach based on optimal view selection for 2D image feature extraction. A. Adam, L. Grammatikopoulos, G. Karras, E. Protopapadakis, K. Karantzalos. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol. XLII-2/W17, pp. 9-16.
  • 2019 Camera calibration using multiple unordered coplanar chessboards. L.Grammatikopoulos, K Adam., E. Petsa, G., Karras. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol. XLII-2/W18, pp. 59-66.
  • 2017 Automatic rectification of building facades. V. Tsironis, A. Tranou, A. Vythoulkas, A. Psalta, E. Petsa, G. Karras. 7th International Workshop on 3D Virtual Reconstruction and Visualization of Complex Architectures (3D ARCH), 1-3 March, Nafplion, Greece
  • 2017 Semi-global matching with self-adjusting penalties. E. Karkalou, C. Stentoumis, G. Karras. 7th International Workshop on 3D Virtual Reconstruction and Visualization of Complex Architectures (3D ARCH), 1-3 March, Nafplion, Greece
  • 2016 A Euclidean formulation of interior orientation constraints imposed by the fundamental matrix. I. Kalisperakis, G. Karras, E. Petsa. ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol. III-3, pp. 75-82.
  • 2016 Automatic adjustment of wide-base Google Street View panoramas. E. Boussias-Alexakis, V. Tsironis, E. Petsa, G. Karras, The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol. XLI-B1, pp. 639-645.
  • 2015 Census-based cost on gradients for matching under illumination differences. C. Stentoumis, A. Amtidis, G. Karras. International Conference on 3D Vision (3DV 2015), October 19-22, Lyon, France, pp. 224-231.
  • 2015 A review and evaluation of penalty functions for semi-global matching. C. Stentoumis, E. Karkalou, G. Karras. IEEE 11th International Conference on In­tel­li­gent Co­mpu­ter Communication and Processing, Cluj-Napoca, Romania, Septem­ber 3-5.
  • 2015 Stereo matching based on census transformation of image gradients. C. Stentoumis, L. Grammatikopoulos, I. Kalisperakis, G. Karras, E. Petsa. In: Videometrics, Range Imaging, and Applications XIII, Proc. SPIE, vol. 9528, Munich, 3-5 September.
  • 2014 On accurate dense stereo-matching using a local adaptive multi-cost approach. C. Stentoumis, L. Grammatikopoulos, I. Kalisperakis, G. Karras. ISPRS Journal of Photogrammetry and Remote Sensing, 91, pp. 29-49
  • 2013 Automatic camera calibration for cultural heritage applications using unstructured planar objects. K. Adam, I. Kalisperakis, L. Grammatikopoulos, G. Karras, E. Petsa. International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XL-5/W2, 2013 - XXIV International CIPA Symposium, 2-6 September, Strasbourg, pp. 1-6.
  • 2013 A local adaptive approach for dense stereomatching in architectural scene reconstruction. C. Stentoumis, L. Grammatikopoulos, I. Kalisperakis, E. Petsa, G. Karras. 5th International Workshop on 3D Virtual Reconstruction and Visualization of Complex Architectures (3D-ARCH 2013), February 25-26, Trento, Italy
  • 2012 Implementing an adaptive approach for dense stereo-matching. C. Stentoumis, L. Grammatikopoulos, I. Kalisperakis, G. Karras. International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. XXXVIII, Part 5, pp. 309-314.
  • 2012 Automatic calibration of stereo-cameras using ordinary chess-board patterns. A. Prokos, I. Kalisperakis, E. Petsa, G. Karras. International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol. XXXVIII, Part 5, pp. 45-49.
  • 2011 A structured-light approach for the reconstruction of complex objects. I. Kalisperakis, L. Grammatikopoulos, E. Petsa, G. Karras, XXIII CIPA International Symposium, Prague, 12-16 Septmeber
  • 2011 Automatic point cloud generation and registration with a stereovision slit-scanner. A. Prokos, I. Kalisperakis, G. Karras, 4th International Workshop 3D-ARCH 2001 "3D Virtual Reconstruction and Visualization of Complex Architectures", 2-4 March, Trento, Italy.
  • 2010 Automatic 3D surface reconstruction by combining stereovision with the slit-scanner approach. A. Prokos, G. Karras, E. Petsa, International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol. XXXVIII, Part 5, pp. 505-509
  • 2009 FAUCCAL: An Open Source Toolbox for Fully Automatic Camera Calibration. V. Douskos, L. Grammatikopoulos, I. Kalisperakis, G. Karras, E. Petsa, XXII CIPA Symposium on Digital Documentation, Interpretation & Presen­ta­tion of Cultural Heritage, October 11-15, 2009, Kyoto, Japan
  • 2009 Design and evaluation of a photogrammetric 3D surface scanner. Prokos A., G. Karras, L. Grammatikopoulos. XXII CIPA Symposium on Digital Documentation, Interpretation & Presen­ta­tion of Cultural Heritage, October 11-15, 2009, Kyoto, Japan
  • 2008 Fully automatic camera calibration using regular planar patterns. V. Douskos, I. Kalisperakis, G. Karras, E. Petsa. International Archives of Photogrammetry, Remote Sesnisng and the Spatial Infromation Sciences, vol. 37(5), pp. 21-26
  • 2007 Laser scanning and automatic multi-image texturing of surface projections. E. Petsa, I. Kalisperakis, L. Grammatikopoulos, G. Karras, V. Pagounis. XXI CIPA International Symposium, Athens, 1-6 October, pp. 579-584.
  • 2007 Automatic calibration of digital cameras using planar chess-board patterns. V. Douskos, I. Kalisperakis, G. Karras. Optical 3-D Measurement Techniques VIII, Wichman Verlag, vol. 1, pp.132-140.
  • 2007 Automatic multi-view texture mapping of 3D surface projections. L. Grammatikopoulos, I. Kalisperakis, G. Karras, E. Petsa. 3D Virtual Reconstruction and Visualization of Complex Architectures (3D Arch '07), July 12-13, ETH Zurich, Switzerland.
  • 2007 Ανάπτυξη Αλγορίθμων για την Αυτόματη Παραγωγή Φωτορρεαλιστικών Μοντέλων Ακριβείας με Συνδυασμό Τεχνικών Φωτογραμμετρίας, Επεξεργασίας Εικόνας και Laser Scanning. Εφαρμογή σε Θέματα Πολιτιστικής Κληρονομιάς. Ε. Πέτσα (επιστημονική υπεύθυνος) Τελική Τεχνική Έκθεση ερευνητικού προγράμματος, ΕΠΕΑΕΚ "ΑΡΧΙΜΗΔΗΣ ΙΙ - Ενίσχυση Ερευνητικών Ομάδων ΤΕΙ"
  • 2007 An automatic approach for camera calibration from vanishing points. L. Grammatikopoulos, G. Karras, E. Petsa. ISPRS Journal of Photogrammetry and Remote Sensing, vol. 62, pp. 64-78.
  • 2007 Generation of orthoimages and perspective views with automatic visibility checking and texture blending. G. Karras, L. Grammatikopoulos, I. Kaisperakis, E. Petsa. Photogrammetric Engineering and Remote Sensing, 73(4), pp. 403-411.
  • 2006 An open-source educational software for basic photogrammetric tasks. I. Kalisperakis, L. Grammatikopoulos, E. Petsa, G. Karras. Proceedings of the FIG-ISPRS-ICA International Symposium on Modern Technologies, Education and Professional Practice in Geodesy and Related Fields, Sofia, 09 - 10 November, pp. 581-586.
  • 2006 A unified approach for automatic camera calibration from vanishing points. L. Grammatikopoulos, G. Karras, E. Petsa, I. Kalisperakis. International Archives of the Photogrammetry, Remote Sensing & Spatial Information Sciences, Vol. XXXVI, Part 5 (in CD).
  • 2006 3D aspects of 2D epipolar geometry. I. Kalisperakis, G. Karras, L. Grammatikopoulos. International Archives of the Photogrammetry, Remote Sensing & Spatial Information Sciences, Vol. XXXVI, Part 3, pp.255-259.
  • 2005 Automatic estimation of vehicle speed from uncalibrated video sequences. L. Grammatikopoulos, G. Karras, E. Petsa. Proc. International Symposium on Modern Technologies, Education and Professional Practice in Geodesy and Related Fields, Sofia, 03 - 04 November, pp. 332-338.
  • 2005 Data fusion from multiple sources for the production of orthographic and perspective views with automatic visibility checking. L. Grammatikopoulos, I. Kalisperakis, G. Karras, E. Petsa. Proc. XX CIPA International Symposium, Torino, 27 September - 1 October, pp. 819-824.
  • 2005 Estimation of camera parameters from stereo pairs with no external control information. I. Kalisperakis, G. Karras, E. Petsa. XX CIPA International Symposium, Torino, 27 September - 1 October, pp. 390-394.
  • 2005 Is it realistic to generate control points from a stereo pair? G. Karras. XX CIPA International Symposium, Torino, 27 September - 1 October, pp. 399-402.
  • 2004 Automatic multi-image photo-texturing of 3D surface models obtained with laser scanning. L. Grammatikopoulos, I. Kalisperakis, G. Karras, T. Kokkinos, E. Petsa. CIPA International Workshop on "Vision Techniques Applied to the Rehabilitation of City Centres", Lisbon, 25-27 October
  • 2004 On automatic orthoprojection and texture-mapping of 3D surface models. L. Grammatikopoulos, I. Kalisperakis, G. Karras, T. Kokkinos, E. Petsa. International Archives of the Photogrammetry, Remote Sensing & Spatial Information Sciences, 35(5), pp. 360-365.
  • 2004 Camera calibration combining images with two vanishing points. L. Grammatikopoulos, G. Karras, E. Petsa.International Archives of the Photogrammetry, Remote Sensing & Spatial Information Sciences, 35(5), pp. 99-104.
  • 2003 Camera calibration approaches using single images of man-made objects. L. Grammatikopoulos, G. E. Karras, E. Petsa. XIX CIPA International Symposium, Antalya, Turkey, 30 September - 4 October, pp. 328-332
  • 2003 Experiences in photogrammetric archaeological recording. D. Mavromati, E. Petsa, G. E. Karras. XIX CIPA International Symposium, Antalya, Turkey, 30 September - 4 October, pp. 666-669.
  • 2003 On multi-image reconstruction from historic photographs. I. Kalisperakis, M. Rova, E. Petsa, G. E. Karras. XIX CIPA International Symposium, Antalya, Turkey, 30 September - 4 October, pp. 216-219.
  • 2002 Abgerissenes Wohnhaus in Athen. E. Petsa, S. Kouroupis, G. Karras. Nahbereichsphotogrammetrie in der Praxis, Th. Luhmann (Hrsg.), Wichmann, pp. 3-6.
  • 2002 Antikes Theater von Sparta. E. Petsa, D. Mavromati, G. Karras Nahbereichsphotogrammetrie in der Praxis, Th. Luhmann (Hrsg.), Wichmann, pp. 55-58.
  • 2002 Altgriechische Turme. G. Karras, E. Petsa, I. Theodoropoulou. Nahbereichsphotogrammetrie in der Praxis, Th. Luhmann (Hrsg.), Wichmann, pp. 59-62.
  • 2002 Geometric information from single uncalibrated images of roads. L. Grammatikopoulos, G. Karras, E. Petsa. International Atchives of Photogrammetry & Remote Sensing, 34(B5), pp. 21-26
  • 2002 Theoretical and practical aspects of archaeological orthoimaging. D. Mavromati, E. Petsa, G. Karras. International Atchives of Photogrammetry & Remote Sensing, 34(B5), pp. 413-418.
  • 2001 Simple calibration techniques for non-metric cameras. G. Karras & D. Mavromati. XVIII CIPA International Symposium, Potsdam, 18-22 September
  • 2001  Inserting the past in video sequences. E. Petsa, S. Kouroupis & G. Karras. XVIII CIPA International Symposium, Potsdam, 18-22 September
  • 2001 Inverse photogrammetry "anticipates" the future. A. Georgopoulos, G. Karras & J. Stergiopoulos. XVIII CIPA International Symposium, Potsdam, 18-22 September
  • 2001 A cost-effective road surveying method for the assessment of road alignments. B. Psarianos, D. Paradisis, B. Nakos & G. Karras. Proc. IV International Symposium Turkish-German Joint Geodetic Days, Berlin, 3-6 April.
  • 2001 Photo-textured rendering of developable surfaces in architectural photogrammetry. G. Karras, E. Petsa, A. Dimarogona & S. Kouroupis. In: B. Fisher, K. Dawson-Howe & C. O’Sullivan (eds.), Virtual and Augmented Archi­tecture - VAA '01, Springer, Berlin, pp. 147-158.
  • 2001 Digital development of large cylindrical and conic structures with a single image technique. I. Theodoropoulou, E. Petsa & G. Karras. The Photogrammetric Record, 17(97):25-37
  • 2000 Constrained line-photogrammetric 3D reconstruction from stereo­pairs. E. Pe­tsa & G. Karras. International Archives of Photogrammetry & Remote Sensing, 33(B5/2), pp. 604-610
  • 2000 Realistic visualisation of 3D models with digital images in large-scale applications. E. Aga, E. Ganiatsa, G, Karras, H. Bitzileki, B. Nakos. 6^th National Cartographic Congress, Athens, 22-27 November (in Greek).
  • 2000 Photogrammetric Measurement of back surface in pregnancy. G. Karras, B. Nakos, I. Tsiliggiris, K. Tympanidis, P. Tympanidou. Greek Orthopedic Surgery & Traumatology, vol. 51, Syppl. 1, p. 67 (in Greek).
  • 2000 Photogrammetric projection of curved surfaces in archaeological and architectural mapping. I. Theodoropoulou, E. Petsa & G. Karras. One-day Symposium on Archaeological and Architectural Photogrammetry, The Photogrammetric Society, York, 30 November.
  • 1999 Metric information from single uncalibrated images. G. Karras & E. Petsa. Proc. XVII CIPA International Symposium, Olinda, Brasil (πρακτικά σε CD)
  • 1999 The photogrammetric survey of a prehistoric site undergoing removal. A. Georgopoulos, G. Karras & G. Makris. The Photogrammetric Record, 16(93):443-456
  • 1999 Digital orthophotography in archaeology with low-altitude non-metric images. G. Karras, D. Mavromati, M. Madani, G. Mavrellis, E. Lymperopoulos, A. Kambourakis & S. Gesafidis. International Archives of Photogrammetry & Remote Sensing, 32(5W11), pp. 8-11
  • 1999 Close-range photogrammetry within a commercial CAD package. T. Glykos, G. Karras & G. Voulgaridis. International Archives of Photogrammetry & Remote Sensing, 32(5W11):103-6
  • 1998 Modeling distortion of super-wide-angle lenses for architectural and archaeological applications. G. Karras, G. Mountrakis, P. Patias & E. Petsa. International Archives of Photogrammetry & Remote Sensing, 32(5):570-573.
  • 1998 Tests on automatic DEM generation in a digital photogrammetric work­station. G. Karras, N. Mavrogenneas, D. Mavromati & N. Tsikonis. International Archives of Photogrammetry & Remote Sensing, 32(2):136-139
  • 1997: Study of posterior trunk surface changes by age and sex using Moire' topography. T. Grivas, G. Karras, G. Katrabassas & N. Papavassiliou. In: Research into Spinal Deformities, J. A. Sevastik & K. M. Diab (eds.), Studies in Health Technology & Informatics, vol. 37, IOS Press, Amsterdam, pp. 331-334.
  • 1997 Raster projection and development of curved surfaces. G. Karras, P. Patias, E. Petsa & K. Ketipis. International Archives of Photogrammetry & Remote Sensing, 32(5C1B), pp. 179-185
  • 1996 Monoplotting and photo-unwrapping of developable surfaces in architectural photogrammetry. G. Karras, P. Patias & E. Petsa. International Archives of Photogrammetry & Remote Sensing, 31(5):290-294
  • 1994 Photogrammetry and spinal deformity: from x-ray to the non-invasive measure­ment of the trunk. G. Karras. Chapter 6 in: Recent Developments in the Study and Treatment of Scoliosis, Th. Grivas (ed.), Paschalidis Medical Publications, Athens, pp. 97-115 (in Greek)
  • 1994: An algorithm for the localization of change in irregularly shaped surfaces. G. Karras & E. Petsa. In: Recent Advances in Experimental Mechanics, J. F. Silva Gomes, F.B. Branco, F. Martins de Brito, J. Gil Saraiva, M. Lurdes Eusιbio, J. Sousa Cirne & A. Correia da Cruz (eds.), Balkema, Rotterdam, pp. 479-482
  • 1993 DEM orientation and detection of deformation in close-range without control. G. Karras & E. Petsa. Photogrammetric Engineering & Remote Sensing, 59(9):1419-1424.
  • 1993 Zur Fassadenentzerrung aus Amateurbildern niedergerissener Altstadtviertel. E. Petsa, G. Karras & G. Aperghis. Zeitschrift für Vermessungswesen und Raumordnung, 58(8):431-436
  • 1993 Experiences with rectification of non-metric digital images when ground control is not available. G. Karras, P. Patias & E. Petsa. Proc. XV International CIPA Symposium, Bucharest
  • 1993 Construction and application of a system for surface topography in the Evangelismos General Hosrpital. G. Karras, Th. Grivas, S. Gesafidis, N, Papavassiliou. Ortho­pediki, , 6(2):113-125 (in Greek)
  • 1992 On the orientation of digital elevation models in biostereometrics. G. Karras. In: Surface Topography & Spinal Deformity, A. Alberti, B. Drerup & E. Hierholzer (eds.), G. Fischer Verlag, Stuttgart, pp. 162-165
  • 1992 On detection of deformation in reconstructed body models. G. Karras & E. Petsa. Proc. International Symposium on 3-D Scoliotic Deformities joined with the VII International Symposium on Spinal Deformity & Surface Topography, J. Dansereau (ed.), G. Fischer Verlag, Stuttgart, pp. 370-375
  • 1992 The use of perspective in uncalibrated images for the documentation of the fa­cades of historic buildings without control. G. Karras & E. Petsa. Terrestrial Photogrammetry and Spatial Information Systems for the Documentation of Cultural Heritage. Ziti Editions, Thessaloniki, pp. σσ. 199-212 (in Greek).
  • 1990 Calibration and accuracy of shadow-Moire' topography. G. Karras. In: Surface Topography and Body Deformity, H. Neugebauer & G. Windischbauer (eds.), G. Fischer Verlag, Stuttgart, pp. 143-145.
  • 1987 Measuring changes in posture during pregnancy. G. Karras & K. Tympanidis. Surface Topography & Spinal Deformity, I.A.F. Stokes, P. Pekelsky, M.S. Moreland (eds.), G. Fischer Verlag, Stuttgart, pp. 131-138
  • 1986 Towards a more rational study of the physiology of pregnancy using contour photography. K. Tympanidis & G. Karras. In: Gynecology and Obstetrics, H. Ludwig & K. Thomsen (eds.), Springer-Verlag, Berlin, pp. 242-250
  • 1984 Moire'-biostereometrics in the case of pregnancy. G. Karras. International Ar­chives of Photogrammetry, 25(A5):462-470.
  • 1984 A non-contact approach of variations in breast geometry during pregnancy. K. Tympanidis & G. Karras. In: Recent Advances in Pathophysiological Conditions in Pregnancy, J.G. Schenker, E.T. Rippmann & D. Weinstein (eds.), Elsevier Science Publishers, Amsterdam, pp. 91-94
  • 1984 Αnthropometric parameters of the physiology of pregnancy determined by photographic body contouring. K. Tympanidis & G. Karras. In: Recent Advances in Pathophysiological Conditions in Pregnancy, J.G. Schenker, E.T. Rippmann & D. Weinstein (eds.), Elsevier Science Publishers, Amsterdam, pp. 83-86
  • 1983 Studying abdomen size and shape variations during pregnancy: an application of Moire' topography. G. Karras & K. Tympanidis. In: Biostereometrics '82, R.E. Herron (ed.), SPIE Proc., vol. 361, pp. 89-91
  • 1982 Lower limb measurements using Moire' topography. G. Karras, E. Petsa, K. Tympanidis. International Archives of Photogrammetry, 24(5):261-271.
  • 1982: Assessing the accuracy of Moire' topography measurements. E. Petsa, G. Karras & J. Badekas. International Archives of Photogrammetry, 24(5):367-376.
  • 1981 X-ray streophotogrammetry: a simple application in obstetrics. Technika Chronika, 1(1-2):133-154 (in Greek)
  • 1980 A special application of photogrammetry: measurement of palatal surface area. Technika Chronika, 49(3):131-134 (in Greek)