Enhancement of multiple color images without color separation error by inverse symmetrical template matching
First Claim
Patent Images
1. A method for enhancing the contour fidelity of printed images including first and second colors, the method comprising:
- obtaining a digital representation of a portion of an image including pixels of a first color and pixels of a second color;
obtaining a first separation comprising said first color pixels in said image portion;
enhancing said first separation according to a first set of templates;
obtaining a second separation comprising said second color pixels in said image portion;
enhancing said second separation according to a second set of templates, each template in said second set being inverse to one of said first set of templates, wherein enhancements for each inverse pair of templates are symmetrical;
combining said first and second enhanced color separations.
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Abstract
A method for enhancing the contour fidelity of printed images of two or more colors is described, which includes obtaining a digital representation of the color image and finding color separations of each color. Each color separation is enhanced by a single set of inverse symmetrical templates, the set including templates in which the second template is always the inverse of the first, and the third and fourth templates are 180 degree rotations of the first two. The resulting smoothed color separations are recombined into an enhanced image without separation error.
47 Citations
9 Claims
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1. A method for enhancing the contour fidelity of printed images including first and second colors, the method comprising:
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obtaining a digital representation of a portion of an image including pixels of a first color and pixels of a second color; obtaining a first separation comprising said first color pixels in said image portion; enhancing said first separation according to a first set of templates; obtaining a second separation comprising said second color pixels in said image portion; enhancing said second separation according to a second set of templates, each template in said second set being inverse to one of said first set of templates, wherein enhancements for each inverse pair of templates are symmetrical; combining said first and second enhanced color separations. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for enhancing the contour fidelity of printed images including first and second colors, the method comprising;
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obtaining a digital representation of a portion of an image including pixels of a first color and pixels of a second color; obtaining a first color separation comprising said first color pixels in said image portion and blank pixels; enhancing said first separation according to a set of inverse symmetrical templates, said enhancement for each of said first color pixels comprising a pattern of subpixels of first color subpixels and blank subpixels; obtaining a second separation comprising said second color pixels in said image portion and blank pixels; enhancing said second separation according to said set of inverse symmetrical templates, said enhancement for each of said second color pixels comprising a pattern of subpixels of second color subpixels and blank subpixels, said second color subpixel pattern being complimentary to said first color subpixel pattern; and combining said first and second enhanced color separations.
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8. A method of enhancing the contour fidelity of a first image represented by a plurality of pixels at a first resolution, said first resolution pixels including pixels of a first color and pixels of a second color, in a second image represented by a plurality of pixels at a second magnified resolution, said second resolution pixels including pixels of the first color and pixels of the second color, comprising the steps of:
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obtaining a digital representation of a portion of an image including pixels of a first color and pixels of a second color; isolating a region of the pixels of said image portion including a pixel formation comprising a central pixel and pixels surrounding said central pixel; obtaining a first color separation of said region comprising said first color pixels in said pixel region and blank pixels; enhancing said central pixel in said first color separation according to a set of inverse symmetrical templates, said enhancement for each of said first color pixels comprising a pattern of subpixels of first color subpixels and blank subpixels; obtaining a second color separation of said region comprising said second color pixels in said image portion and blank pixels; enhancing said central pixel in said second separation according to said set of inverse symmetrical templates, said enhancement for each of said second color pixels comprising a pattern of subpixels of second color subpixels and blank subpixels; and combining said first and second enhanced color separations. - View Dependent Claims (9)
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Specification