Method of and apparatus for forming halftone images

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358459, 358298, H04N 140

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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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