Method and apparatus for carrying out a dithering operation

Details Method and apparatus for carrying out a dithering operation Method and apparatus for carrying out a dithering operation

1987-08-14

1989-01-24

Britton, Howard W.

Electrical resistors

Ribbon resistance element bent or curved on flat side

Zigzag or sinuous

358241, 358282, 358283, 358298, H04N 140

Patent

active

048004430

ABSTRACT:
A two-dimensional array of binary values is used to control operation of a bi-level imaging device. The array of binary values is formed by applying an enhanced array g(u,v) to a two-dimensional array of threshold values. A two-dimensional array of pixel value f(u,v) is used to form the enhanced array g(u,v) such that g(u,v)=m.sub.f +k[f(u,v)-m.sub.f ] where m.sub.f is the average value of f(u+a, v+b) from a=-L to a=+L and b=-M to b=+M and k is a gain function which depends on the standard deviation in f(u+c, v+d) from c=-N to c=+N and d=-P to d=+P. L, M, N and P define the sub-array over which the standard deviation is calculated. Preferably, L, M, N and P are each equal to 2. The value of k is a decreasing function of the standard deviation: the larger the standard deviation, the smaller the gain factor k. The rate at which k decreases with increase in the standard deviation depends on the edge sampling characteristics of the array of threshold values.

REFERENCES:
patent: 4710822 (1987-12-01), Matsunawa
patent: 4741046 (1988-04-01), Matsunawa

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