Polar halftone methods for radial printing

a technology of radial printing and halftones, applied in printing, printing mechanisms, information storage, etc., can solve the problems of moiré interference patterns, poor results on disc media, distracting the viewer, etc., and achieve the effect of reducing or eliminating interference patterns and reducing distortion and artifacts

Inactive Publication Date: 2006-10-26
ELESYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The use of polar halftone techniques significantly reduces or eliminates moiré interference patterns, resulting in higher image quality with minimal distortion during radial printing on rotating circular media.

Problems solved by technology

However, when Cartesian halftones undergo this conversion and are used with radial printing applications, the transformed halftones (as shown in FIG. 5) yield poor results on disc media 210 and often exhibit moiré interference patterns 510˜520.
The resulting moiré interference patterns during radial printing are distracting to the viewer, dominate the visage, and vary unpredictably with color, intensity, and hue.
As a result, when used for radial printing applications, traditional Cartesian-based halftone techniques inherently cause moiré patterns and are thus usually not suitable for radial printing.

Method used

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  • Polar halftone methods for radial printing
  • Polar halftone methods for radial printing
  • Polar halftone methods for radial printing

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second embodiment

[0047] By way of a second embodiment, TABLE 2 illustrates a polar halftone pattern set with a more pronounced ring pattern effect in the resulting printed output. This cell pattern is designed to start at the center of each cell and fill out as more intensity bits are added for higher density values. Since a concentration for halftone dots is in the center, a ringing pattern is more visually apparent at some densities.

TABLE 2A 4 × 4 Polar Halftone with Emphasis on the Arc Direction0000intensity 00000000000000000intensity 10010000000000000intensity 20110000000000000intensity 30110001000000000intensity 40110011000000010intensity 50110011000000010intensity 61110011000000010intensity 71110011001000010intensity 81110011101000110intensity 91110111101000110intensity 101110111101100110intensity 111111111101101110intensity 121111111001101111intensity 131111111101101111intensity 141111111101111111intensity 15111111111111

third embodiment

[0048] By way of a third embodiment, TABLE 3 below illustrates a polar halftone pattern that emphasizes resolution in the radial spoke direction, but produces better images at 600 DPI radial printing resolution.

TABLE 3A 6 × 6 Polar Halftone with Emphasis on the Spoke Direction000000intensity 0000000000000000000000000000000000000intensity 1000100000000000000000100000000000100intensity 2000100000000000100000100000000000100intensity 3000100000100000100000100000100000100intensity 4001100000100001100000100001100001100intensity 5001100001100001100001100001100001100intensity 6001100011100001100011100001100011100intensity 7011100001100011100001100011100011100intensity 8011100011100011100011100011100011100intensity 9011110011100011110011100011110011110intensity 10011110011110011110011110011110111110intensity 11011110111110011110111110011110111110intensity 12111110011110111110111110111110111110intensity 13111111111110111110111111111110111111intensity 14111110111111111110111111111111111111inte...

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Abstract

Disclosed are apparatus and methods for implementing polar halftone techniques that substantially reduce or eliminate interference patterns while printing on rotating circular media with a radial print system. In one embodiment, Cartesian image pixels are selected such that screen pixels or “dots” are arranged fan-shaped along radii (or “spokes”) and in annular ring segments (or “arcs”). Halftone sampling frequency may be varied along spokes and arcs or along a polynomial curve relative to the center of spinning media, in order to reduce distortion and artifacts.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. application Ser. No. 10 / 207,662, filed Jul. 26, 2002, which claims the benefit of U.S. Provisional Application No. 60 / 310,303, filed Aug. 3, 2001. This application also relates to U.S. application Ser. No. 09 / 062,300, filed Apr. 17, 1998, now U.S. Pat. No. 6,264,295, issued Jul. 24, 2001. These applications are hereby incorporated by reference.FIELD OF THE INVENTION [0002] The present invention relates to fluid dispensing devices and methods for printing on spinning circular media. More particularly, it concerns mechanisms for applying halftone screens in angular and radial directions to printing with minimal image distortion on rotating circular media discs. BACKGROUND OF THE INVENTION [0003] In the art of dispensing fluidic ink objects as it applies to radial printing, there is a need to place ink objects accurately and precisely onto the spinning circular media to effectively use the mechani...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): H04N1/405
CPCB41J3/4071H04N1/405G11B23/40B41J19/16
InventorJONES, RANDY Q.UNTER, JAN E.
OwnerELESYS