Artistic Rendering Final Project Initial Proposal

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Artistic RenderingFinal Project Initial Proposal

• Jeremy Shopf
• September 14, 2006

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Problem

• Paintings are static!
• Can we change composition of the scene,
  properties of existing objects or can we insert
  new objects without disruption?
• Artists use varying colors to shade objects in a
  scene to convey mood

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Extracting surface orientation

• Need geometry of an object to acquire lighting
  model and to apply new properties or change the
  lighting
• Image-based Material Editing
• Khan Et Al. 2006

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Image-based Material Editing

• Uses pixel intensity as an estimate of distance
  from the viewpoint
• Apply a bilateral (edge-preserving) filter to the
  object to remove high frequency detail and
  specular highlights
• Generate depth map from pixel intensities
• Calculate surface orientation from depth values

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Examples
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Extracting Appearance

• Object is painted a different color based on the
  lighting and surface orientation at that point
• Examine all pixels at a given orientation w.r.t.
  the light and get the average color
• Repeat for all orientations
• Fit the colors recorded for all angles to a
  smooth 1D function of the angle
• Use to relight the object or apply to another
  object

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(No Transcript)
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Limitations

• Homogeneous materials
• No indirect light or occlusion
• Consistent shading
• Smooth strokes