US5647026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniformity correction and threshold or halftoning conversion unit and method
Assignee: Eastman Kodak Co
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Filing: 1991-10-29
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Granted: 1997-07-08
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Expires: 2011-10-29
Abstract
Abstract The present invention is a system and method that performs a scaling and thresholding operation or a scaling and halftoning operation for each pixel from an image sensor in a single step. The system creates, depending on a mode selected, scaled threshold values or scaled dither matrix values from the scan of a reference document and a predetermined threshold or a predetermined dither matrix. The values are loaded into a single memory. The output of the memory is supplied to a comparator which compares the pixel data from the scanner sensor to the scaled threshold values or the scaled dither matrix values. The serial output of the comparator is converted into parallel data and stored for further processing.
Inventors
- 👤 Brian J. Kwarta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:29
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/401; H04N1/403
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
128 words
A method of performing image data format conversion for pixels from a pixel sensor, comprising the steps of: (a) scanning a reference document and creating a scale factor for each pixel from the reference document scan; (b) creating, when a mode is threshold, a scaled threshold value for each pixel using a combined threshold and the scale factor for each pixel; (c) creating, when the mode is dither, a scaled dither matrix for each pixel using a combined dither matrix and the scale factor for each pixel; (d) scanning an actual document producing actual image data; and (e) comparing the actual image data to one of the scaled thresholds or the scaled dither matrix responsive to the mode and outputting format converted image data responsive to the comparison.
Claim 2
Independent Claim
128 words
A method of performing image data format conversion for pixels from a pixel sensor, comprising the steps of: (a) scanning a reference document and creating a scale factor for each pixel from the reference document scan; (b) creating, when a mode is threshold, a scaled threshold value for each pixel using a combined threshold and the scale factor for each pixel; (c) creating, when the mode is dither, a scaled dither matrix for each pixel using a combined dither matrix and the scale factor for each pixel; (d) scanning an actual document producing actual image data; and (e) comparing the actual image data to one of the scaled thresholds or the scaled dither matrix responsive to the mode and outputting format converted image data responsive to the comparison.
Claim 3
Dependent Claim
38 words
A method as recited in claim 1, further comprising the step of (f) outputting scaled image data using the scale factor for each pixel and the actual image data when the mode is not threshold and not dither.
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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) | 2000-07-07 | 2001-01-06 | 2001-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-07 | 2005-01-06 | 2005-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-07 | 2009-01-06 | 2009-07-08 | $7700.00 | Window Closed / Lapsed |