Ordered Dither
Pseudo-random quantization errors
Matrix stores pattern of threshholds
i = x mod n
j = y mod n
e = I(x,y) - trunc(I(x,y))
if (e > D(i,j))
P(x,y) = ceil(I(x, y))
else
P(x,y) = floor(I(x,y))
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