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 Werner Purgathofer

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Average citations per article9.48
Citation Count436
Publication count46
Publication years1988-2016
Available for download16
Average downloads per article344.25
Downloads (cumulative)5,508
Downloads (12 Months)293
Downloads (6 Weeks)29
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46 results found Export Results: bibtexendnoteacmrefcsv

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1 published by ACM
October 2016 NordiCHI '16: Proceedings of the 9th Nordic Conference on Human-Computer Interaction
Publisher: ACM
Bibliometrics:
Citation Count: 0
Downloads (6 Weeks): 4,   Downloads (12 Months): 30,   Downloads (Overall): 47

Full text available: PDFPDF
Technology holds significant value for supporting visually impaired people in experiencing cultural heritage. Creating tactile adaptions of artifacts or paintings is a challenging task that comprises the need for a careful surface design, a good choice of material and interaction design sensible to the needs and abilities of the target ...
Keywords: Tactile reliefs, haptic devices, visually impaired people, design case, finger tracking

2 published by ACM
October 2016 ASSETS '16: Proceedings of the 18th International ACM SIGACCESS Conference on Computers and Accessibility
Publisher: ACM
Bibliometrics:
Citation Count: 4
Downloads (6 Weeks): 6,   Downloads (12 Months): 77,   Downloads (Overall): 116

Full text available: PDFPDF
For blind and visually impaired people, tactile reliefs offer many benefits over the more classic raised line drawings or tactile diagrams, as depth, 3D shape and surface textures are directly perceivable. However, without proper guidance some reliefs are still difficult to explore autonomously. In this work, we present a gesture-controlled ...
Keywords: evaluation, finger tracking, tactile reliefs, blind users, gesture detection, interactive audio guide

3
November 2013
Bibliometrics:
Citation Count: 0

This book presents the tutorial notes of the Eurographics '89 conference held in Hamburg in September 1989. Recognized experts of the field have contributed excellent overviews of main stream areas of computer graphics. Especially written for this book the articles give an up-to-date survey of the topics selected. The contents ...

4
September 2013 Computer Graphics Forum: Volume 32 Issue 6, September 2013
Publisher: The Eurographs Association & John Wiley & Sons, Ltd.
Bibliometrics:
Citation Count: 32

This paper provides a comprehensive overview of urban reconstruction. While there exists a considerable body of literature, this topic is still under active research. The work reviewed in this survey stems from the following three research communities: computer graphics, computer vision and photogrammetry and remote sensing. Our goal is to ...
Keywords: I.3.5 [Computer Graphics]: Computational Geometry and Object Modelling, urban modelling, city reconstruction, photogrammetric modelling, inverse-procedural modelling, structure from motion, urban reconstruction, I.4.6 [Image Processing And Computer Vision]: Scene Analysis, I.4.9 [Image Processing And Computer Vision]: Applications, city modelling, facade modelling, image-based modelling

5
May 2013 Computers and Graphics: Volume 37 Issue 3, May, 2013
Publisher: Pergamon Press, Inc.
Bibliometrics:
Citation Count: 1

Shape primitives are a valuable input for reconstructing 3D models from point clouds. In this paper we present a method for clipping simple shape primitives at reasonable boundaries. The shape primitives, e.g. planes or cylinders, are 2D manifolds which are automatically detected in unstructured point clouds. Shape boundaries are necessary ...
Keywords: Shape primitives, Reconstruction, Shape boundaries

6
July 2012 ICCHP'12: Proceedings of the 13th international conference on Computers Helping People with Special Needs - Volume Part II
Publisher: Springer-Verlag
Bibliometrics:
Citation Count: 5

Computer-aided tools offer great potential for the design and production of tactile models. While many publications focus on the design of essentially two-dimensional media like raised line drawings or the reproduction of three-dimensional objects, we intend to broaden this view by introducing a taxonomy that classifies the full range of ...
Keywords: 3D scanning, design for all, CAM, accessibility, CAD, blind people, tactile graphics, tactile models, visually impaired people

7 published by ACM
November 2011 Journal on Computing and Cultural Heritage (JOCCH): Volume 4 Issue 2, November 2011
Publisher: ACM
Bibliometrics:
Citation Count: 9
Downloads (6 Weeks): 5,   Downloads (12 Months): 62,   Downloads (Overall): 545

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The aim of this work is to bring the cultural heritage of two-dimensional art closer to being accessible by blind and visually impaired people. We present a computer-assisted workflow for the creation of tactile representations of paintings, suitable to be used as a learning tool in the context of guided ...
Keywords: blind people, visual to tactile conversion, 2D to 3D conversion, visually impaired people, haptic output, learning tool, museum, tactile medium

8
October 2011 ISMAR '11: Proceedings of the 2011 10th IEEE International Symposium on Mixed and Augmented Reality
Publisher: IEEE Computer Society
Bibliometrics:
Citation Count: 1

We present a novel adaptive color mapping method for virtual objects in mixed-reality environments. In several mixed-reality applications, added virtual objects should be visually indistinguishable from real objects. Recent mixed-reality methods use global-illumination algorithms to approach this goal. However, simulating the light distribution is not enough for visually plausible images. ...

9
November 2010 ISVC'10: Proceedings of the 6th international conference on Advances in visual computing - Volume Part II
Publisher: Springer-Verlag
Bibliometrics:
Citation Count: 0

This paper describes a new method for matching line segments between two images in order to compute the relative camera pose. This approach improves the camera pose for images lacking stable point features but where straight line segments are available. The line matching algorithm is divided into two stages: At ...

10
June 2010 SG'10: Proceedings of the 10th international conference on Smart graphics
Publisher: Springer-Verlag
Bibliometrics:
Citation Count: 2

In this paper we present a novel approach to visualize irregularly occurring events. We introduce the event line view designed specifically for such events data (a subset of time dependent data). The event line view is integrated in a coordinated multiple views (CMV) system and linked with other conventional views ...
Keywords: interactive visual analysis, tag cloud, coordinated multiple views, events in time

11 published by ACM
May 2010 SCCG '10: Proceedings of the 26th Spring Conference on Computer Graphics
Publisher: ACM
Bibliometrics:
Citation Count: 3
Downloads (6 Weeks): 0,   Downloads (12 Months): 4,   Downloads (Overall): 119

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Typical building facades consist of regular structures such as windows arranged in a predominantly grid-like manner. We propose a method that handles precisely such facades and assumes that there must be horizontal and vertical repetitions of similar patterns. Using a Monte Carlo sampling approach, this method is able to segment ...
Keywords: image-based urban reconstruction, image segmentation, image processing

12 published by ACM
May 2010 SCCG '10: Proceedings of the 26th Spring Conference on Computer Graphics
Publisher: ACM
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 0,   Downloads (12 Months): 2,   Downloads (Overall): 101

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We present a new interactive modeling technique for reconstructing 3D objects from multiple images. We specifically address the problems that arise in industrial environments during camera orientation, image segmentation and modeling. An accurate camera orientation is ensured by using coded markers and surveyed points from a total station. Interactive segmentations ...
Keywords: multi-view reconstruction, model fitting

13 published by ACM
May 2010 SCCG '10: Proceedings of the 26th Spring Conference on Computer Graphics
Publisher: ACM
Bibliometrics:
Citation Count: 1
Downloads (6 Weeks): 0,   Downloads (12 Months): 12,   Downloads (Overall): 183

Full text available: PDFPDF
Procedural modeling for architectural scenes was as yet limited to static objects only. We introduce a novel extension layer for shape grammars which creates a skeletal system for posing and interactive manipulation of generated models. Various models can be derived with the same set of parametrized rules for geometric operations. ...
Keywords: procedural modeling, shape grammars, skeletal animation, architecture

14 published by ACM
April 2009 SCCG '09: Proceedings of the 25th Spring Conference on Computer Graphics
Publisher: ACM
Bibliometrics:
Citation Count: 2
Downloads (6 Weeks): 0,   Downloads (12 Months): 8,   Downloads (Overall): 75

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In this paper we describe a method for designing and visualizing folds in leather car seats. Since the manufacturing process cannot completely control the final result, an accurate simulation is neither possible nor needed; instead this tool functions as a sketchpad for the designer, and as a means for communicating ...
Keywords: folds, surface modeling, wrinkles, user interaction, procedural modeling

15 published by ACM
November 2006 GRAPHITE '06: Proceedings of the 4th international conference on Computer graphics and interactive techniques in Australasia and Southeast Asia
Publisher: ACM
Bibliometrics:
Citation Count: 12
Downloads (6 Weeks): 2,   Downloads (12 Months): 15,   Downloads (Overall): 423

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Fluorescence is an interesting and visually prominent effect, which has not been fully covered by Computer Graphics research so far.While the physical phenomenon of fluorescence has been addressed in isolation, the actual reflection behaviour of real fluorescent surfaces has never been documented, and no analytical BRDF models for such surfaces ...
Keywords: analytical BRDF models, fluorescence

16
May 2005 Computational Aesthetics'05: Proceedings of the First Eurographics conference on Computational Aesthetics in Graphics, Visualization and Imaging
Publisher: Eurographics Association
Bibliometrics:
Citation Count: 14

Contrast in image processing is usually defined as a ratio between the darkest and the brightest spots of an image. In this paper we introduce a different contrast definition. The newly introduced Global Contrast Factor (GCF) corresponds closer to the human perception of contrast. GCF uses contrasts at various resolution ...

17
May 2005 Computational Aesthetics'05: Proceedings of the First Eurographics conference on Computational Aesthetics in Graphics, Visualization and Imaging
Publisher: Eurographics Association
Bibliometrics:
Citation Count: 0

One aspect of Computational Aesthetics is the finding of harmonic colours for the objects in a scene. Although the obtained degree of colour harmony is a subjective criterion, experience shows that on average human observers tend to have quite similar responses to individual colour stimuli and their combinations. This observation ...

18 published by ACM
May 2005 SCCG '05: Proceedings of the 21st Spring Conference on Computer Graphics
Publisher: ACM
Bibliometrics:
Citation Count: 2
Downloads (6 Weeks): 0,   Downloads (12 Months): 5,   Downloads (Overall): 314

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We discuss the validation of BTF data measurements by means used for BRDF measurements. First, we show how to apply the Helmholtz reciprocity and isotropy for a single data set. Second, we discuss a cross-validation for BRDF measurement data obtained from two different measurement setups, where the measurements are not ...
Keywords: BRDF data validation, BRDF data acquisition, predictive rendering, reflectance function

19 published by ACM
April 2005 I3D '05: Proceedings of the 2005 symposium on Interactive 3D graphics and games
Publisher: ACM
Bibliometrics:
Citation Count: 8
Downloads (6 Weeks): 1,   Downloads (12 Months): 5,   Downloads (Overall): 402

Full text available: PDFPDF
Impostors are image-based primitives commonly used to replace complex geometry in order to reduce the rendering time needed for displaying complex scenes. However, a big problem is the huge amount of memory required for impostors. This paper presents an algorithm that automatically places impostors into a scene so that a ...

20
June 2004 EGSR'04: Proceedings of the Fifteenth Eurographics conference on Rendering Techniques
Publisher: Eurographics Association
Bibliometrics:
Citation Count: 15

Under certain circumstances the polarisation state of the illumination can have a significant influence on the appearance of scenes; outdoor scenes with specular surfaces - such as water bodies or windows - under clear, blue skies are good examples of such environments. In cases like that it can be essential ...



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