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[Hal95b]  Non-Photorealistic Shape Cues for Visualization

Hall:1995:NPS (In proceedings)
Author(s)Hall P.
Title« Non-Photorealistic Shape Cues for Visualization »
InProceedings of WSCG'95 (PilzeHASH(0x897aef4)n, feb 1995)
Editor(s)Václav Skala
Page(s)113--122
Year1995
Editor(s)Václav Skala

Abstract
Visualization applications often need to display objects that are both three dimensional and coloured. The objects may be represented either by surfaces or by volumes. The motivation behind such displays is to demonstrate two or more independent variables at once. So one variable may determine object shape and anotehr variable may determine the distribution of colour. A lighting model is needed to provide cues for visual shape recognition. Conventional lighting models provide these cues by altering colour. Hence a conflict arises when this approach is adopted because the total color variation is made up of two components that are perceptually indistinguishable. There are variations that show the distribution of a variable, and global variations caused by the lighting model. It might be said that a side effect of the light model is to distort the information represented by colour. This paper offers a solution to this problem be replacing the conventional lighting model with a structured lighting model of the kind used in machine vision context. The proposed solution simulates the shadow of a regular, planar grid on the surface of an object. Improved shape cues can be obtained by using a grid that is sensitive to lighting conditions, this generates a cross-hatch shading effect. The notion of a planar grid easily generalises to three dimensions, where it can be used not only with surfaces, but also with volumes. The benefit of the method is that colour is effected only locally, and in well defined places; the remaining colour is readily identifable and faithfully represents underlying data. In addition, the method in either of its forms is simple to incorporate into existing renderers. The method is demonstrated with results obtained from a computation fluid dynamics application. Both coloured iso-surfaces and coloured volumes are shown.

BibTeX code
@inproceedings{Hall:1995:NPS,
  optnote = {},
  optaddress = {},
  optorganization = {},
  author = {Peter M. Hall},
  optkey = {},
  optannote = {},
  optseries = {},
  editor = {V{\'{a}}clav Skala},
  optpublisher = {},
  localfile = {papers/Hall.1995.NPS.pdf},
  optmonth = {},
  citeseer = {http://citeseer.ist.psu.edu/context/2025672/0},
  optcrossref = {},
  booktitle = {{P}roceedings of {WSCG'95} (Pilze{\v{n}}, feb 1995)},
  optabstract = {},
  optstatus = {url},
  optvolume = {},
  optnumber = {},
  abstract = {Visualization applications often need to display objects that are
              both three dimensional and coloured. The objects may be
              represented either by surfaces or by volumes. The motivation
              behind such displays is to demonstrate two or more independent
              variables at once. So one variable may determine object shape and
              anotehr variable may determine the distribution of colour. A
              lighting model is needed to provide cues for visual shape
              recognition. Conventional lighting models provide these cues by
              altering colour. Hence a conflict arises when this approach is
              adopted because the total color variation is made up of two
              components that are perceptually indistinguishable. There are
              variations that show the distribution of a variable, and global
              variations caused by the lighting model. It might be said that a
              side effect of the light model is to distort the information
              represented by colour. This paper offers a solution to this
              problem be replacing the conventional lighting model with a
              structured lighting model of the kind used in machine vision
              context. The proposed solution simulates the shadow of a regular,
              planar grid on the surface of an object. Improved shape cues can
              be obtained by using a grid that is sensitive to lighting
              conditions, this generates a cross-hatch shading effect. The
              notion of a planar grid easily generalises to three dimensions,
              where it can be used not only with surfaces, but also with
              volumes. The benefit of the method is that colour is effected only
              locally, and in well defined places; the remaining colour is
              readily identifable and faithfully represents underlying data. In
              addition, the method in either of its forms is simple to
              incorporate into existing renderers. The method is demonstrated
              with results obtained from a computation fluid dynamics
              application. Both coloured iso-surfaces and coloured volumes are
              shown.},
  title = {{N}on-{P}hotorealistic {S}hape {C}ues for {V}isualization},
  year = {1995},
  pages = {113--122},
}

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