IdealLowPassFilterif D(u,v)≤DoIdeallow-passfilterH(u,v)ifD(u,v)D0D.is the cutoff frequency and D(u,v)is the distance between (u,v)and thefrequencyorigin.H(n,n)H(u.a)+D(a.n)Do
Ideal Low Pass Filter
IdealLowPassFilteruseless.eventhoughaonly8%ofimagepowerislost!aaaaaaaanotice bothaaaaablurring andringing!aa9aaaaaaaaraaaaaaaIdeal Low Pass Filter with larger and largerradii DO
Ideal Low Pass Filter Ideal Low Pass Filter with larger and larger radii D0