Importance

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Abstract

Apparatus and an accompanying method for use therein are disclosed for suppressing a screener induced Moire pattern that would otherwise appear in a reproduced color image generated by a raster based marking engine (20). This Moire pattern results from successively sampling a stored bit-mapped font pattern in a grid like raster based writing pattern in order to produce a visual depiction of the stored font pattern in the image. Specifically, this Moire is suppressed by forming an address, for use in successively accessing each desired bit in the stored font pattern, in which the address is formed of at least two portions in which each portion is generated through a summation of an orthogonal positional value with a corresponding specific amount of noise. The amount is a substantially random value occurring within a noise function (1720) that is defined by a substantially uniform probability distribution occurring throughout a region, in the position domain, that has a width equal to the spacing between adjacent micro pixels that form the visual depiction and is substantially zero valued elsewhere. Use of such an amount of noise is sufficient to substantially suppress the amplitude of this screener induced Moire pattern that would otherwise occur in the reproduced image but is advantageously insufficient to inject any distinct artifacts into the image or affect image Moires.

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First Claim