Method and apparatus for replicating a two-color original image with foreground and background colors exchanged
First Claim
1. Apparatus for replicating a two-color original image with foreground and background colors exchanged, said apparatus comprising:
- an image source for generating a signal representing the color information of each successive pixel of a two-color original image, said signal being separated into a plurality of tristimulus-value color planes represented in a three dimensional color coordinate system such that the planes of the received signal specify the color of pixels of the original image in a color space that describes the gamut of color, each color plane having a characteristic color data distribution;
a histogram generator which produces a histogram of the color data distribution of each color plane of a two-color original image;
a semiconductor storage device for storing the histograms;
means for determining a translation point within each histogram; and
means for translating the three color plane image data about the translation point.
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Accused Products
Abstract
Replication of a two-color original image with foreground and background colors exchanged is effected on a received signal representing the color information of each successive pixel of a two-color original image by generating a histogram of the color data distribution for each color plane of the original image, determining a translation point within each histogram, and performing a histogram translation of the color plane image data about the translation point. The translation point may be determined by selecting the approximate midpoint between the foreground information and the background information in each histogram as the translation point, or by selecting the statistical average of each histogram as the translation point. Once the translation point is determined, a new color data value for each pixel in a color plane is selected by subtracting the pixel'"'"'s original color data value from twice the color data value of the translation point.
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Citations
4 Claims
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1. Apparatus for replicating a two-color original image with foreground and background colors exchanged, said apparatus comprising:
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an image source for generating a signal representing the color information of each successive pixel of a two-color original image, said signal being separated into a plurality of tristimulus-value color planes represented in a three dimensional color coordinate system such that the planes of the received signal specify the color of pixels of the original image in a color space that describes the gamut of color, each color plane having a characteristic color data distribution; a histogram generator which produces a histogram of the color data distribution of each color plane of a two-color original image; a semiconductor storage device for storing the histograms; means for determining a translation point within each histogram; and means for translating the three color plane image data about the translation point. - View Dependent Claims (2, 3, 4)
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Specification