11
Antialiasing
Scan conversion with super-sampling.
How can we achieve this? Two possibilities:
1. Scan convert once to a super-sampled grid, then
average down.
Cost:
1
scan conversion
s2 x p2 storage, where there are (s x s) samples per
pixel, (p x p) image
s2 x p2 pixel writes
2. Perform many normal scan
conversions at super-sampled locations, and additively combine them. You will
implement this method using an accumulation
buffer (coming
up).
Cost:
s2 scan conversions
2p2 storage
s2 x p2 pixel writes
(demo: overheads, program)