US5295202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for replicating a two-color original image with foreground and background colors exchanged
Assignee: Eastman Kodak Co
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Filing: 1991-08-19
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Granted: 1994-03-15
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Expires: 2011-08-19
Abstract
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.
Inventors
- 👤 James J. Steinkirchner
- 👤 Lawrence B. Telle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:07
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N1/4072; H04N1/4074; H04N1/46; H04N1/56; H04N1/60
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
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.
Claim 2
Dependent Claim
143 words
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.
Claim 3
Dependent Claim
73 words
Apparatus as defined in claim 1 wherein said translating means comprises: memory for storing the received signal during histogram generation and translation point determination; and means for performing the computation x'=2x mid -x on the stored signal, where x is the color data value of a particular pixel, x mid is the color data value at the determined transition point, and x' is the color data value assigned to that pixel after translation.
Claim 4
Dependent Claim
38 words
The apparatus as set forth in claim 1 wherein said means for determining a translation point includes means for selecting the approximate midpoint between the foreground information and the background information in each histogram as the translation point.
Claim 5
Dependent Claim
30 words
The apparatus as set forth in claim 1 wherein said means for determining a translation point includes means for selecting the statistical average of each histogram as the translation point.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-14 | 1997-09-13 | 1998-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-14 | 2001-09-13 | 2002-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-14 | 2005-09-13 | 2006-03-15 | $7700.00 | Window Closed / Lapsed |