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SUMMARY:Advances in Image Compositing - Mark Grundland\, University of Cam
 bridge
DTSTART:20060831T131500Z
DTEND:20060831T140000Z
UID:TALK5217@talks.cam.ac.uk
CONTACT:nad10 (at) cl.cam
DESCRIPTION:Linear interpolation is the standard image blending method use
 d in image compositing. By averaging in the dynamic range\, it reduces con
 trast and visibly degrades the quality of composite imagery. We demonstrat
 e how to correct linear interpolation to resolve this longstanding problem
 . To provide visually meaningful\, high level control over the compositing
  process\, we introduce three novel image blending operators that are desi
 gned to preserve key visual characteristics of their inputs. Our contrast 
 preserving method applies a linear color mapping to recover the contrast l
 ost due to linear interpolation. Our salience preserving method retains th
 e most informative regions of the input images by balancing their relative
  opacity with their relative saliency. Our color preserving method extends
  homomorphic image processing by establishing an isomorphism between the i
 mage colors and the real numbers\, allowing any mathematical operation def
 ined on real numbers to be applied to colors without losing its algebraic 
 properties or mapping colors out of gamut. These approaches to image blend
 ing have artistic uses in image editing and video production as well as te
 chnical applications such as image morphing and mipmapping.\n\nThis short 
 talk will cover the work which will be presented in "Cross Dissolve Withou
 t Cross Fade: Preserving Contrast\, Color and Salience in Image Compositin
 g" by Mark Grundland\, Rahul Vohra\, Gareth P. Williams\, and Neil A. Dodg
 son at the upcoming EUROGRAPHICS Annual Conference.\n
LOCATION:Rainbow Room (FS07)\, Computer Laboratory
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