Werner Purgathofer | Tu Wien (original) (raw)
I am a professor of Computer Science ("informatics") at TU Wien in Vienna, Austria.
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Graduate Center of the City University of New York
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Papers by Werner Purgathofer
Informatik Fachberichte, 1985
Proceedings of Eurographics, 2001
... 2. Visibility from region or from viewpoint Occlusion culling methods have to determine the s... more ... 2. Visibility from region or from viewpoint Occlusion culling methods have to determine the set of objects that are potentially visible (potentially visible set (PVS)) from the current viewpoint. ... 83-90 15. Pavan K. Desikan, TM Murali and Pankaj K. Agarwal. ...
Smart Graphics, Jan 1, 2004
This paper introduces a tangible user interface for browsing and retrieving images from an image ... more This paper introduces a tangible user interface for browsing and retrieving images from an image database. The basis for the query to the image database is a color layout sketch, which is used by the underlying query algorithm to find the best matches. The users are provided with colored cubes of various sizes (1.5 to 4 cm) and colors (8 base colors). The users can place and arrange the colored cubes on a small table to create a color layout sketch. Multiple users can use this interface to collaborate in an image query. To evaluate the benefits of the interface, it is compared to a traditional GUI application in which the users use a mouse to create a color layout sketch.
Lecture Notes in Computer Science, 2004
This paper introduces a tangible user interface for browsing and retrieving images from an image ... more This paper introduces a tangible user interface for browsing and retrieving images from an image database. The basis for the query to the image database is a color layout sketch, which is used by the underlying query algorithm to find the best matches. The users are provided with colored cubes of various sizes (1.5 to 4 cm) and colors (8 base colors). The users can place and arrange the colored cubes on a small table to create a color layout sketch. Multiple users can use this interface to collaborate in an image query. To evaluate the benefits of the interface, it is compared to a traditional GUI application in which the users use a mouse to create a color layout sketch.
This paper describes an accurate method to obtain the Tone Reproduction Curve (TRC) of display de... more This paper describes an accurate method to obtain the Tone Reproduction Curve (TRC) of display devices without using a measurement device. It is an improvement of an existing technique based on human observation, solving its problem of numerical instability and resulting in functions in log-log scale which correspond better to the nature of display devices. We demonstrate the effiency of our technique on different monitor technologies, comparing it with direct measurements using a spectrophotometer.
The Visual Computer, Jan 1, 1996
Informatik Fachberichte, 1985
Proceedings of Eurographics, 2001
... 2. Visibility from region or from viewpoint Occlusion culling methods have to determine the s... more ... 2. Visibility from region or from viewpoint Occlusion culling methods have to determine the set of objects that are potentially visible (potentially visible set (PVS)) from the current viewpoint. ... 83-90 15. Pavan K. Desikan, TM Murali and Pankaj K. Agarwal. ...
Smart Graphics, Jan 1, 2004
This paper introduces a tangible user interface for browsing and retrieving images from an image ... more This paper introduces a tangible user interface for browsing and retrieving images from an image database. The basis for the query to the image database is a color layout sketch, which is used by the underlying query algorithm to find the best matches. The users are provided with colored cubes of various sizes (1.5 to 4 cm) and colors (8 base colors). The users can place and arrange the colored cubes on a small table to create a color layout sketch. Multiple users can use this interface to collaborate in an image query. To evaluate the benefits of the interface, it is compared to a traditional GUI application in which the users use a mouse to create a color layout sketch.
Lecture Notes in Computer Science, 2004
This paper introduces a tangible user interface for browsing and retrieving images from an image ... more This paper introduces a tangible user interface for browsing and retrieving images from an image database. The basis for the query to the image database is a color layout sketch, which is used by the underlying query algorithm to find the best matches. The users are provided with colored cubes of various sizes (1.5 to 4 cm) and colors (8 base colors). The users can place and arrange the colored cubes on a small table to create a color layout sketch. Multiple users can use this interface to collaborate in an image query. To evaluate the benefits of the interface, it is compared to a traditional GUI application in which the users use a mouse to create a color layout sketch.
This paper describes an accurate method to obtain the Tone Reproduction Curve (TRC) of display de... more This paper describes an accurate method to obtain the Tone Reproduction Curve (TRC) of display devices without using a measurement device. It is an improvement of an existing technique based on human observation, solving its problem of numerical instability and resulting in functions in log-log scale which correspond better to the nature of display devices. We demonstrate the effiency of our technique on different monitor technologies, comparing it with direct measurements using a spectrophotometer.
The Visual Computer, Jan 1, 1996