Creating an image to be printed using halftone blending
First Claim
1. A method for creating an image to be printed, comprising:
- selecting a first halftone pattern for a first periodic clustered dot halftone region of the image to be printed wherein the first periodic clustered dot halftone region has a first frequency;
selecting a second halftone pattern for a second periodic clustered dot halftone region of the image to be printed wherein the second periodic clustered dot halftone region has a second frequency and wherein one of the frequencies is higher than the other frequency;
determining a transition region that includes a boundary between the two halftone regions and includes additional portions of the two halftone regions beyond the boundary, wherein the additional portions are respective subsets of each of the two halftone regions and wherein a fixed width is used for the entire transition region; and
blending the two halftone patterns with each other in the transition region based on a blending ratio of the two halftone patterns that changes as a function of distance between the edges of the transition region, wherein the selecting of the first and second halftone patterns, the determining and the blending are performed by one or more computer processors and wherein the blending of the two halftone patterns further comprises;
controlling a strength of the blending ratio based on an angle between the boundary and a screen vector associated with a respective region.
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Accused Products
Abstract
A method for creating an image to be printed is provided. A first halftone pattern and a second halftone pattern for respective first and second periodic clustered dot halftone regions of the image are selected. The regions have respective frequencies and one of the frequencies is higher than the other frequency. A transition region is determined. The transition region includes a boundary between the two regions and includes additional portions of the two regions beyond the boundary. The two halftone patterns are blended with each other in the transition region based on a blending ratio of the two halftones where the blending ratio changes as a function of distance between the edges of the transition region.
19 Citations
11 Claims
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1. A method for creating an image to be printed, comprising:
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selecting a first halftone pattern for a first periodic clustered dot halftone region of the image to be printed wherein the first periodic clustered dot halftone region has a first frequency; selecting a second halftone pattern for a second periodic clustered dot halftone region of the image to be printed wherein the second periodic clustered dot halftone region has a second frequency and wherein one of the frequencies is higher than the other frequency; determining a transition region that includes a boundary between the two halftone regions and includes additional portions of the two halftone regions beyond the boundary, wherein the additional portions are respective subsets of each of the two halftone regions and wherein a fixed width is used for the entire transition region; and blending the two halftone patterns with each other in the transition region based on a blending ratio of the two halftone patterns that changes as a function of distance between the edges of the transition region, wherein the selecting of the first and second halftone patterns, the determining and the blending are performed by one or more computer processors and wherein the blending of the two halftone patterns further comprises; controlling a strength of the blending ratio based on an angle between the boundary and a screen vector associated with a respective region. - View Dependent Claims (2, 3, 4)
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5. A system for creating an image to be printed, comprising:
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a computer processor; a halftone pattern selecting component configured for selecting a first halftone pattern for a first periodic clustered dot halftone region of the image to be printed wherein the first periodic clustered dot halftone region has a first frequency; the halftone pattern selecting component configured for selecting a second halftone pattern for a second periodic clustered dot halftone region of the image to be printed wherein the second periodic clustered dot halftone region has a second frequency and wherein one of the frequencies is higher than the other frequency; a transition region determiner component configured for determining a transition region that includes a boundary between the two halftone regions and includes additional portions of the two halftone regions beyond the boundary, wherein the additional portions are respective subsets of each of the two halftone regions and wherein a fixed width is used for the entire transition region; and a halftone pattern blending component configured for blending the two halftone patterns with each other in the transition region based on a blending ratio of the two halftone patterns that changes as a function of distance between the edges of the transition region, and wherein the halftone pattern blending component is further configured for selecting a blending pair that minimizes a cost function that is based on an absorptance cost and a ratio cost, and wherein the halftone pattern blending component is further configured to perform; for each pixel in the transition region, computing an output pixel that takes the maximum of the two halftone patterns using the blending pair. - View Dependent Claims (6, 7)
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8. A non-transitory computer readable storage medium having computer-executable instructions stored thereon for causing a computer system to perform a method of creating an image to be printed, the method comprising:
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selecting a first halftone pattern for a first periodic clustered dot halftone region of the image to be printed wherein the first periodic clustered dot halftone region has a first frequency; selecting a second halftone pattern for a second periodic clustered dot halftone region of the image to be printed wherein the second periodic clustered dot halftone region has a second frequency and wherein one of the frequencies is higher than the other frequency; determining a transition region that includes a boundary between the two halftone regions and includes additional portions of the two halftone regions beyond the boundary wherein the additional portions are respective subsets of each of the two halftone regions and wherein a fixed width is used for the entire transition region; and blending the two halftone patterns with each other in the transition region based on a blending ratio of the two halftone patterns that changes as a function of distance between the edges of the transition region, wherein the blending of the two halftone patterns further comprises; controlling a strength of the blending ratio based on an angle between the boundary and a screen vector associated with a respective region. - View Dependent Claims (9, 10, 11)
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Specification