hig.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Hast, Anders
Publications (10 of 62) Show all publications
Hast, A., Jenke, P. & Seipel, S. (2013). Shortest diagonal triangulation of convex layers. In: Proceedings of the IASTED International Conference on Signal Processing, Pattern Recognition and Applications, SPPRA 2013: . Paper presented at IASTED International Conference on Signal Processing, Pattern Recognition and Applications, SPPRA 2013, February 12 – 14, 2013, Innsbruck, Austria (pp. 424-430).
Open this publication in new window or tab >>Shortest diagonal triangulation of convex layers
2013 (English)In: Proceedings of the IASTED International Conference on Signal Processing, Pattern Recognition and Applications, SPPRA 2013, 2013, p. 424-430Conference paper, Published paper (Refereed)
Abstract [en]

One problem in the field of computational geometry is the triangulation of convex layers. The rotating caliper algorithm is an alternative to the constrained Delaunay triangulation method. We present an improved triangulation algorithm, which gives a mesh quality close to that of the Constrained Delaunay but substantially faster. Each layer will be connected to the neighboring layer by edges and from the two vertices constituting an edge the proposed algorithm will select the shortest diagonal to its next neighbors in the polygonal chain on the other side, i.e. from the outer layer to the inner layer or vice versa. We discuss quality issues regarding the rotating caliper method and some improvements to it, as well as how a Constrained Delaunay can be efficiently implemented for convex layers.

Keyword
Computational geometry; Constrained delaunay; Convex layers; Rotating caliper; Shortest diagonal; Triangulation
National Category
Computer Sciences
Identifiers
urn:nbn:se:hig:diva-15219 (URN)10.2316/P.2013.798-101 (DOI)2-s2.0-84876519357 (Scopus ID)
Conference
IASTED International Conference on Signal Processing, Pattern Recognition and Applications, SPPRA 2013, February 12 – 14, 2013, Innsbruck, Austria
Available from: 2013-09-13 Created: 2013-09-13 Last updated: 2018-03-13Bibliographically approved
Hast, A., Weidendorfer, J. & Weiss, J.-P. (2012). UCHPC 2011: Fourth Workshop on UnConventional High Performance Computing. In: EURO-PAR 2011: PARALLEL PROCESSING WORKSHOPS, PT II. Paper presented at 17th International Euro-Par Conference on Parallel Processing, AUG 29-SEP 02, 2011, Bordeaux, FRANCE (pp. 333-334). Berlin: Springer Berlin/Heidelberg
Open this publication in new window or tab >>UCHPC 2011: Fourth Workshop on UnConventional High Performance Computing
2012 (English)In: EURO-PAR 2011: PARALLEL PROCESSING WORKSHOPS, PT II, Berlin: Springer Berlin/Heidelberg, 2012, p. 333-334Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Berlin: Springer Berlin/Heidelberg, 2012
Series
Lecture Notes in Computer Science, ISSN 0302-9743 ; 7156
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:hig:diva-22081 (URN)000371244100037 ()2-s2.0-84882595014 (Scopus ID)978-3-642-29740-3 (ISBN)978-3-642-29739-7 (ISBN)
Conference
17th International Euro-Par Conference on Parallel Processing, AUG 29-SEP 02, 2011, Bordeaux, FRANCE
Available from: 2016-07-04 Created: 2016-07-04 Last updated: 2018-03-13Bibliographically approved
Marchetti, A., Hast, A., Shepherd, J. & Tesconi, M. (2011). Geomemories - a Spatial-Temporal Atlas of the Italian Landscape. In: Proceedings of International Symposium on Virtual Reality, Archaeology and Cultural Heritage: . Paper presented at VAST 2011 International Symposium on Virtual Reality, Archaeology and Cultural Heritage, Prato, Tuscany, Italy, October 18-21, 2011.
Open this publication in new window or tab >>Geomemories - a Spatial-Temporal Atlas of the Italian Landscape
2011 (English)In: Proceedings of International Symposium on Virtual Reality, Archaeology and Cultural Heritage, 2011Conference paper, Published paper (Refereed)
National Category
Computer Sciences
Identifiers
urn:nbn:se:hig:diva-10591 (URN)
Conference
VAST 2011 International Symposium on Virtual Reality, Archaeology and Cultural Heritage, Prato, Tuscany, Italy, October 18-21, 2011
Available from: 2011-09-30 Created: 2011-09-30 Last updated: 2018-03-13Bibliographically approved
Hast, A. & Marchetti, A. (2011). Retrospective Illumination Correction of Greyscale Historical Aerial Photos. In: Proceedings of International Conference on Image Analysis and Processing. Paper presented at International Conference on Image Analysis and Processing, 14-16 sept 2011, Ravenna, Italy (pp. 275-284).
Open this publication in new window or tab >>Retrospective Illumination Correction of Greyscale Historical Aerial Photos
2011 (English)In: Proceedings of International Conference on Image Analysis and Processing, 2011, p. 275-284Conference paper, Published paper (Refereed)
National Category
Computer Sciences
Identifiers
urn:nbn:se:hig:diva-10559 (URN)
Conference
International Conference on Image Analysis and Processing, 14-16 sept 2011, Ravenna, Italy
Available from: 2011-09-29 Created: 2011-09-29 Last updated: 2018-03-13Bibliographically approved
Hast, A., Bengtsson, L., Weidendorfer, J. & Wu, R. (2011). UCHPC 2010: Third workshop on unConventional high performance computing. In: Guarracino, MR; Vivien, F; Traff, JL; Cannataro, M; Danelutto, M; Hast, A; Perla, F; Knupfer, A; DiMartino, B; Alexander, M (Ed.), Euro-Par 2010 Parallel Processing Workshops: HeteroPar, HPCC, HiBB, CoreGrid, UCHPC, HPCF, PROPER, CCPI, VHPC, Ischia, Italy, August 31–September 3, 2010, Revised Selected Papers. Paper presented at Parallel Processing Workshops, Euro-Par 2010, Ischia; Italy; 31 August 2010 through 3 September 2010 (pp. 327-328). Berlin: Springer Berlin/Heidelberg
Open this publication in new window or tab >>UCHPC 2010: Third workshop on unConventional high performance computing
2011 (English)In: Euro-Par 2010 Parallel Processing Workshops: HeteroPar, HPCC, HiBB, CoreGrid, UCHPC, HPCF, PROPER, CCPI, VHPC, Ischia, Italy, August 31–September 3, 2010, Revised Selected Papers / [ed] Guarracino, MR; Vivien, F; Traff, JL; Cannataro, M; Danelutto, M; Hast, A; Perla, F; Knupfer, A; DiMartino, B; Alexander, M, Berlin: Springer Berlin/Heidelberg, 2011, p. 327-328Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
Berlin: Springer Berlin/Heidelberg, 2011
Series
Lecture Notes in Computer Science, ISSN 0302-9743 ; 6586
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:hig:diva-17946 (URN)10.1007/978-3-642-21878-1_40 (DOI)000371301900040 ()2-s2.0-80051680700 (Scopus ID)
Conference
Parallel Processing Workshops, Euro-Par 2010, Ischia; Italy; 31 August 2010 through 3 September 2010
Available from: 2014-11-11 Created: 2014-11-11 Last updated: 2018-03-13Bibliographically approved
Seipel, S. & Hast, A. (2010). A Local Curvature Based Lighting Model for Rendering of Snow. In: Yingcai Xiao, Tomaz Amon and Roberto Muffoletto (Ed.), Proceedings of IADIS International Conference Computer Graphics, Visualization, Computer Vision and Image Processing 2010 (CGVCVIP 2010): . Paper presented at IADIS International Conference Computer Graphics, Visualization, Computer Vision and Image Processing 2010 (CGVCVIP 2010), 27-29 July 2010, Freiburg, Germany (pp. 367-372).
Open this publication in new window or tab >>A Local Curvature Based Lighting Model for Rendering of Snow
2010 (English)In: Proceedings of IADIS International Conference Computer Graphics, Visualization, Computer Vision and Image Processing 2010 (CGVCVIP 2010) / [ed] Yingcai Xiao, Tomaz Amon and Roberto Muffoletto, 2010, p. 367-372Conference paper, Published paper (Refereed)
Abstract [en]

Local illumination models try to describe the interaction between light and objects in the scene based on only few parameters representing some geometric and material properties at a given point on a surface. In this paper we present our research in local illumination models for the purpose of approximating light transport and shadow-masking effects in the local neighborhood of the surface point under evaluation. We assume that the amount of curvature at a surface point to some extent represents geometric properties in the surrounding neighborhood of this point. From this we define an empirical illumination model for diffuse reflecting materials which controls the amount of locally scattered light from the neighborhood as well as subsurface light transport based on some curvature metric.

Keyword
Curvature based rendering, Diffuse illumination, Shading models, Snow rendering
National Category
Computer Sciences Computer Engineering
Identifiers
urn:nbn:se:hig:diva-12952 (URN)2-s2.0-79955157388 (Scopus ID)978-972-8939-22-9 (ISBN)
Conference
IADIS International Conference Computer Graphics, Visualization, Computer Vision and Image Processing 2010 (CGVCVIP 2010), 27-29 July 2010, Freiburg, Germany
Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2018-03-13Bibliographically approved
Hast, A., Ericsson, M. & Seipel, S. (2010). Multiscale Texture Synthesis and Colourization of Greyscale Textures. In: 18th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, WSCG 2010 - In Co-operation with EUROGRAPHICS: Full Papers Proceedings. Paper presented at 18th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, 1-4 February 2010, Plzen, Czech Republic (pp. 55-61). Plzen: Union Agency Science Press
Open this publication in new window or tab >>Multiscale Texture Synthesis and Colourization of Greyscale Textures
2010 (English)In: 18th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, WSCG 2010 - In Co-operation with EUROGRAPHICS: Full Papers Proceedings, Plzen: Union Agency Science Press , 2010, p. 55-61Conference paper, Published paper (Refereed)
Abstract [en]

The main idea presented herein is to use a multiscale texture synthesis approach in order to both colourize and upscale greyscale textures. Such textures can be vintage photos to be used in archaeological or urban 3D visualizations and obviously the colour needs to be reconstructed some way. Due to limited quality, walls etc in such 3D visualizations will appear either pixelized or blurry when the viewer approaches them on a close distance. The latter if some kind of interpolation technique is being used to reduce the pixelization. The low resolution greyscale texture and a high resolution coloured texture is used for the colourization and upscaling, which will produce a colour version of the greyscale texture with 4 times higher resolution in each upscale step. The novel idea is to use multiscale texture synthesis in HSV space for the first upscale in order to create a RGB colour image for subsequent upscaling, using either ordinary RGB multiscale texture synthesis or continue using HSV multiscale texture synthesis. These two main approaches will be compared and discussed.

Place, publisher, year, edition, pages
Plzen: Union Agency Science Press, 2010
Keyword
Multiscale Texture Synthesis, Colorization, Colour transfer, Greyscale Photos
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:hig:diva-22084 (URN)000309143400008 ()2-s2.0-84862058437 (Scopus ID)978-80-86943-87-9 (ISBN)978-808694388-6 (ISBN)
Conference
18th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, 1-4 February 2010, Plzen, Czech Republic
Available from: 2016-07-04 Created: 2016-07-04 Last updated: 2018-03-13Bibliographically approved
Jenke, P., Hast, A. & Seipel, S. (2010). On the quality of point-cloud triangulations based on convex hulls. In: Proceedings of the Annual SIGRAD Conference 2010. Paper presented at SIGRAD Conference 2010, November 25-26, Västerås, Sweden (pp. 71-76).
Open this publication in new window or tab >>On the quality of point-cloud triangulations based on convex hulls
2010 (English)In: Proceedings of the Annual SIGRAD Conference 2010, 2010, p. 71-76Conference paper, Published paper (Refereed)
National Category
Computer Sciences
Identifiers
urn:nbn:se:hig:diva-12949 (URN)
Conference
SIGRAD Conference 2010, November 25-26, Västerås, Sweden
Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2018-03-13Bibliographically approved
Ericsson, M., Hast, A. & Seipel, S. (2009). A Heterogeneous Cluster framework for Computationally Heavy Visualizations. In: Proceedings of IADIS Applied Computing 2009. Paper presented at IADIS International Conference Applied Computing 2009, 19-21 November, Rome, Italy (pp. 337-339).
Open this publication in new window or tab >>A Heterogeneous Cluster framework for Computationally Heavy Visualizations
2009 (English)In: Proceedings of IADIS Applied Computing 2009, 2009, p. 337-339Conference paper, Poster (with or without abstract) (Refereed)
National Category
Computer Sciences Computer Engineering
Identifiers
urn:nbn:se:hig:diva-12955 (URN)
Conference
IADIS International Conference Applied Computing 2009, 19-21 November, Rome, Italy
Available from: 2012-09-18 Created: 2012-09-18 Last updated: 2018-03-13Bibliographically approved
Hast, A. & Weidendorfer, J. (Eds.). (2009). Computing Frontiers 2009: UCHPC-MAW '09: Proceedings of the combined workshops on UnConventional high performance computing workshop plus memory access workshop. Association for Computing Machinery (ACM)
Open this publication in new window or tab >>Computing Frontiers 2009: UCHPC-MAW '09: Proceedings of the combined workshops on UnConventional high performance computing workshop plus memory access workshop
2009 (English)Conference proceedings (editor) (Other academic)
Place, publisher, year, edition, pages
Association for Computing Machinery (ACM), 2009. p. 32
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:hig:diva-11218 (URN)978-1-60558-557-4 (ISBN)978-1-60558-413-3 (ISBN)
Available from: 2012-01-06 Created: 2012-01-06 Last updated: 2018-03-13Bibliographically approved
Organisations

Search in DiVA

Show all publications