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US5006938A
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Half-tone image generator using white noise source
Assignee: Eastman Kodak Co
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Filing: 1989-12-28
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Granted: 1991-04-09
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Expires: 2009-12-28
Abstract
Abstract A half-tone binarization generator that produces high-quality half-tone binarization images by converting multilevel brightness information into sets of black and white bitonal data by adding noise to the multilevel brightness information and using a thresholding technique.
Inventors
- 👤 Kikuo Mita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:03
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/405; H04N1/4051
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
A half-tone binarization generator whereby input multilevel brightness information is converted to represent the brightness information as black and white level signals, comprising: noise generating means for generating noise; extraction means for extracting high-frequency components from the noise generated by the noise generating means; adder means for adding the high-frequency noise from the extraction means to the multilevel brightness information; comparison binarization means for comparing brightness information to which the high-frequency noise has been added by the adder means with a predetermined threshold value and providing a black level signal or a white level signal depending if the noise added brightness information is smaller or larger than the threshold value.
Claim 2
Dependent Claim
110 words
A half-tone binarization generator whereby input multilevel brightness information is converted to represent the brightness information as black and white level signals, comprising: noise generating means for generating noise; extraction means for extracting high-frequency components from the noise generated by the noise generating means; adder means for adding the high-frequency noise from the extraction means to the multilevel brightness information; comparison binarization means for comparing brightness information to which the high-frequency noise has been added by the adder means with a predetermined threshold value and providing a black level signal or a white level signal depending if the noise added brightness information is smaller or larger than the threshold value.
Claim 3
Dependent Claim
26 words
The half-tone binarization generator according to claim 1 wherein the noise generation means generates white noise having an energy distribution in all of the frequency ranges.
Claim 4
Dependent Claim
34 words
The half-tone binarization generator according to claim 1 including a memory means for storing the high-frequency noise and wherein the added means adds the high-frequency noise from the memory means to the brightness information.
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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) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |