Color halftone screen utilizing preselected halftone dots placed

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

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Details

358456, 358458, 358 75, 358 80, 358 78, H04N 146

Patent

active

052027724

ABSTRACT:
A plurality of halftone screen density data structures utilizing halftone dot patterns which arrays the halftone dots at preselected screen angles and at a preselected distance to create a screened halftone separation. By arraying the halftone dots at preselected screen angles, the human eye is confused into perceiving continuous patterns and is less likely to perceive any Moire pattern than when using conventional methods. The data structures are created by arranging for every halftone dot in at least one halftone dot pattern of the data structures to be surrounded by a plurality of dots having their dot centers at preselected screen angles and at a preselected distance from the dot center of the center halftone dot. The halftone dots are superimposed over a plurality of bits arranged as a bit map which is representative of a pixel format utilized to produce screens wherein each bit in the bit map is assigned a value in a predetermined fashion. The values are utilized when binary representations of the density of an image for a sampled area are transformed to pixel format. Through this process, the halftone screen density data structures are utilized to transform binary representations of images to a pixel format which is utilized to reproduce a desired artwork.

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