Non-perpendicular, equal frequency non-conventional screen patte

Details Non-perpendicular, equal frequency non-conventional screen patte Non-perpendicular, equal frequency non-conventional screen patte

1993-02-08

1996-12-10

Couso, Jose L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

G03B 2160

Patent

active

055836607

ABSTRACT:
A screen system used in the electro-optical reproduction of half-tone pictures in multicolor prints are generated by an algorithm which simulates a continuous tone image containing a range of gray shades from black to white or a color separation. The "threshold equation" is the key of the invention as it calculates a threshold gray value that is compared to the desired local image value to determine whether that particular point should be "on" or "off". Which points (spots) are "on" and which are "off" is determined by the function that assigns a "threshold" value (the shade at which a pixel changes from "off" to "on") based on a pixels "x" and "y" coordinates. The generated screen comprises columns and rows of halftone dot centers in which there is equal spacing in row to row, column to column, and column to rows relationships, but the columns are not geometrically orthogonal (perpendicular) to the rows.

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