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- Presence Acceleration
Detect large (nearly) empty areas taversing a 
pyramid
(determing when 
as a given value), fill this regions with average
values from the average pyramid.
problems: it ignores accumulated opacity and it moves up the pyramide too fast. - Homogeneity Acceleration
Like Presence Acceleration but with a 
pyramid.
Lukas Mroz
Tue Feb 9 12:46:24 MET 1999