MOIRE-FREE COLOR HALFTONE CONFIGURATION
First Claim
1. A method comprising:
- receiving image data;
defining a first color halftone screen having a first fundamental frequency vector Vc1 and second fundamental frequency vector Vc2;
defining a second color halftone screen having a first fundamental frequency vector Vm1 and second fundamental frequency vector Vm2; and
,selecting the values of the fundamental frequency vectors to identify combinations in accordance with the following;
applying the defined first color halftone screen and the defined second color halftone screen to the received image data and printing the result.
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Abstract
Disclosed herein is a Moiré-free color halftone configuration for clustered dots. Unlike conventional methods, the disclosed method produces periodic hexagon rosettes of identical shapes. These exemplary hexagon rosettes have three fundamental spatial frequencies exactly equal to half of the fundamental frequency of the three halftone screens. The resultant halftone outputs are truly Moiré free, as all the fundamentals and harmonic frequencies are multiples of and thus higher in frequency than the rosette fundamental frequency. The halftone outputs resulting from the employment of the exemplary rosette design methodology provided herein, are also robust to the typical misregistration among color separations commonly found in color systems.
13 Citations
27 Claims
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1. A method comprising:
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receiving image data; defining a first color halftone screen having a first fundamental frequency vector Vc1 and second fundamental frequency vector Vc2; defining a second color halftone screen having a first fundamental frequency vector Vm1 and second fundamental frequency vector Vm2; and
,selecting the values of the fundamental frequency vectors to identify combinations in accordance with the following; applying the defined first color halftone screen and the defined second color halftone screen to the received image data and printing the result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14)
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3. The method of claim 1 further comprising:
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defining a third color halftone screen having a first fundamental frequency vector Vk1 and second fundamental frequency vector Vk2; and selecting the values of the fundamental frequency vectors to identify combinations that further satisfy the following;
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4. The method of claim 2 further comprising:
selecting the values of the fundamental frequency vectors to identify combinations that further satisfy the following;
Vc1+Vm1−
Vk1=0, and
Vc2+Vm2−
Vk2=0.
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5. The method of claim 1 where the defined first color halftone screen having a first fundamental frequency vector Vc1 and second fundamental frequency vector Vc2, comprises the color cyan.
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6. The method of claim 1 where the defined second color halftone screen having a first fundamental frequency vector Vm1 and second fundamental frequency vector Vm2, comprises the color magenta.
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7. The method of claim 2 where the defined third color halftone screen having a first fundamental frequency vector Vk1 and second fundamental frequency vector Vk2, comprises the color black.
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8. The method of claim 2 where a resultant halftone screen comprises hexagon rosettes of identical shape and two-dimension periodic.
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14. The method of claim 8 where the resultant cluster screen comprises hexagon rosettes of identical shape and two-dimension periodic.
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9. A method comprising:
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receiving image data; defining a first color halftone screen having a first fundamental frequency vector Vc1 and second fundamental frequency vector Vc2; defining a second color halftone screen having a first fundamental frequency vector Vm1 and second fundamental frequency vector Vm2; and
,where the sum of the first color halftone screen second fundamental frequency vector Vc2 and the second color halftone screen first fundamental frequency vector Vm1 equate to a function of the first color halftone screen first fundamental frequency vector Vc1, and further where the difference of the second color halftone screen second fundamental frequency vector Vm2 taken from the first color halftone screen first fundamental frequency vector Vc1 equates to a function of the second color halftone screen first fundamental frequency vector Vm1; and
,applying the defined first color halftone screen and the defined second color halftone screen to the received image data and printing the result. - View Dependent Claims (10, 11, 12, 13)
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15. A method for a color system comprising:
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receiving image data; defining a first color halftone screen having a first fundamental frequency vector Vc1 and second fundamental frequency vector Vc2; defining a second color halftone screen having a first fundamental frequency vector Vm1 and second fundamental frequency vector Vm2; defining a third color halftone screen having a first fundamental frequency vector Vk1 and second fundamental frequency vector Vk2; and
, adjusting the values of the fundamental frequency vectors to identify combinations that satisfy the following;applying the defined first color halftone screen, the defined second color halftone screen, and the defined third color halftone screen to the received image data and printing the result. - View Dependent Claims (16, 17)
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18. A color printing apparatus providing a hexagon rosette for halftoning of image data in printed reproduction comprising:
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a first color halftone screen including, a first fundamental frequency vector Vc1 and a value associated therewith, as well as, a second fundamental frequency vector Vc2 and a value associated therewith; and
,a second color halftone screen including, a first fundamental frequency vector Vm1 and a value associated therewith, as well as, a second fundamental frequency vector Vm2 and a value associated therewith; the values assigned said first and second color halftone screen fundamental frequencies being interrelated by the printing apparatus applying the first color halftone screen and the second color halftone screen to image data and printing a final printout. - View Dependent Claims (19, 20, 21, 22)
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23. A color printing apparatus providing a hexagon rosette for halftoning of image data in printed reproduction comprising:
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a first color halftone screen including, a first fundamental frequency vector Vx1, as well as, a second fundamental frequency vector Vx2; a second color halftone screen including, a first fundamental frequency vector Vy1, as well as, a second fundamental frequency vector Vy2; and
,a third color halftone screen including, a first fundamental frequency vector Vz1, as well as, a second fundamental frequency vector Vz2; said first, second and third color halftone screen fundamental frequencies being interrelated by; the printing apparatus applying the first color halftone screen, the second color halftone screen, and the third color halftone screen to image data and printing a final printout. - View Dependent Claims (24, 25, 26, 27)
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Specification