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[CRH+03b]  Stroke Surfaces: A Spatio-temporal Framework for Temporally Coherent Non-photorealistic Animations

Collomosse:2003:SSS (Technical report)
Author(s)Collomosse J., Rowntree D. and Hall P.
Title« Stroke Surfaces: A Spatio-temporal Framework for Temporally Coherent Non-photorealistic Animations »
NumberCSBU 2003--01
InstitutionDepartment of Computer Science, University of Bath, U.K.
Year2003
URLhttp://www.cs.bath.ac.uk/~jpc/research.htm#strokesurface

Abstract
We present a novel framework for the automated synthesis of non-photorealistic animations from video sequences. Our approach is unique in that we interpret the source video sequence as a spatio-temporal voxel volume, with time as the third dimension. Video frames are segmented into homogeneous regions, and heuristic associations between regions formed over time to produce a collection of conceptually high level spatio-temporal objects. These objects carve sub-volumes through the video volume delimited by continuous isosurface ``Stroke Surface'' patches. By manipulating objects in this representation we are able to synthesise a wide gamut of artistic effects, which we allow the user to stylise and influence through a parameterised ``Video Paintbox''. In addition to novel temporal effects unique to our method we demonstrate the extension of `traditional' static NPR styles to video including painterly, sketchy and 'toon shading effects. An application to advanced rotoscoping is also identified. The high level of analysis afforded by our spatio-temporal approach allows us to maintain a high degree of temporal coherence; a property scarce in current NPR video techniques which process video at a low level (on a per pixel, per frame sequential basis). The paper concludes with a critical appraisal and discussion of future applications for the Stroke Surface representation, including potential for video compression.

BibTeX code
@techreport{Collomosse:2003:SSS,
  www =
         {http://www.bath.ac.uk/comp-sci/publications/technicalseries/report/2003-01.shtml},
  number = {CSBU 2003--01},
  month = jun,
  optissn = {1740-9497},
  optaddress = {Bath, UK},
  author = {John P. Collomosse and David Rowntree and Peter M. Hall},
  url = {http://www.cs.bath.ac.uk/~jpc/research.htm#strokesurface},
  title = {{S}troke {S}urfaces: {A} {S}patio-temporal {F}ramework for
           {T}emporally {C}oherent {N}on-photorealistic {A}nimations},
  abstract = {We present a novel framework for the automated synthesis of
              non-photorealistic animations from video sequences. Our approach
              is unique in that we interpret the source video sequence as a
              spatio-temporal voxel volume, with time as the third dimension.
              Video frames are segmented into homogeneous regions, and heuristic
              associations between regions formed over time to produce a
              collection of conceptually high level spatio-temporal objects.
              These objects carve sub-volumes through the video volume delimited
              by continuous isosurface ``Stroke Surface'' patches. By
              manipulating objects in this representation we are able to
              synthesise a wide gamut of artistic effects, which we allow the
              user to stylise and influence through a parameterised ``Video
              Paintbox''. In addition to novel temporal effects unique to our
              method we demonstrate the extension of `traditional' static NPR
              styles to video including painterly, sketchy and 'toon shading
              effects. An application to advanced rotoscoping is also
              identified. The high level of analysis afforded by our
              spatio-temporal approach allows us to maintain a high degree of
              temporal coherence; a property scarce in current NPR video
              techniques which process video at a low level (on a per pixel, per
              frame sequential basis). The paper concludes with a critical
              appraisal and discussion of future applications for the Stroke
              Surface representation, including potential for video
              compression.},
  localfile = {papers/Collomosse.2003.SSS.pdf},
  institution = {Department of Computer Science, University of Bath, U.K.},
  year = {2003},
}

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