↓ ↑	↓ ↑	↓ ↑
linear	26 Aug 10	38.2k
gaussian mask	26 Aug 10	48.6k
median mask	26 Aug 10	53.9k
by hand	26 Aug 10	64.3k
shad high	26 Aug 10	64.4k
NODR	26 Aug 10	68.1k
naive over	26 Aug 10	74.3k