Method of and apparatus for forming halftone images

Details Method of and apparatus for forming halftone images Method of and apparatus for forming halftone images

1993-10-07

1994-12-06

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358459, 358298, H04N 140

Patent

active

053716124

ABSTRACT:
Screen angles .theta.1, .theta.2 and .theta.3 of first through the third halftone images, which are strongly related to the generation of moire, are determined by setting values of integers m1, n1, m2, n2, m3 and n3 which defines the screen angles by tan.theta.1=n1/m1, tan.theta.2=n2/m2, tan.theta.3=n3/m3. Suppose that first through third square areas for the first through third halftone dots have side lengths of L1, L2 and L3, which are integers, the first through third square areas includes (m1.sup.2 +n1.sup.2), (m2.sup.2 +n2.sup.2), and m3.sup.2 +n3.sup.2) pieces of halftone dots, respectively. The values of the integers is determined to satisfy: m1/L1-m2/L2=n3/L3; and -n1/L1+n2/L2=m3/L3.

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