Patent US4894726A successfully refreshed from Google Patents.
US4894726A
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US
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Methods and apparatus for eliminating Moire interference using quasiperiodic patterns
Assignee: TRUSTEES OF UNIVERSITY OF PENNSYLVANIA A NON-PROFIT CORP OF
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Filing: 1988-07-21
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Granted: 1990-01-16
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Expires: 2008-07-21
Abstract
Abstract Improved methods for reproducing an image are disclosed. Images are created using dots or patterns which are substantially quasiperiodic and thereby eliminate Moire interference patterns. In multi-color applications, the disclosed methods simplify the color overlay process. Also disclosed are patterns for creating half-tone images which do not exhibit Moire interference patterns when overlaid. Electronic display apparatus using these patterns are also disclosed.
Inventors
- 👤 Paul J. Steinhardt
- 👤 Philip Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:12
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/52; H04N1/40; H04N1/405; H04N1/4051
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
79 words
A method of reproducing an image, comprising the step of converting an image into at least one half-tone image; said half-tone image having areas to be substantially filled with color and areas to be substantially free from color arrayed substantially in accordance with a pattern comprising a plurality of identifiable elements, the intervals between said elements and the frequencies with which said elements appear being described by ratios which cannot be expressed as the ratio of two whole numbers.
Claim 2
Independent Claim
79 words
A method of reproducing an image, comprising the step of converting an image into at least one half-tone image; said half-tone image having areas to be substantially filled with color and areas to be substantially free from color arrayed substantially in accordance with a pattern comprising a plurality of identifiable elements, the intervals between said elements and the frequencies with which said elements appear being described by ratios which cannot be expressed as the ratio of two whole numbers.
Claim 3
Dependent Claim
16 words
The method of claim 1, further comprising the step of creating a plurality of half-tone images.
Claim 4
Dependent Claim
19 words
The method of claim 2, further comprising the step of successively overlaying each of said plurality of half-tone images.
Claim 5
Dependent Claim
22 words
The method of claim 1, wherein said method of reproducing an image is a method of printing an image upon an object.
Claim 6
Dependent Claim
11 words
An object printed in accordance with the method of claim 4.
Claim 7
Dependent Claim
22 words
The method of claim 3, wherein said method of reproducing an image is a method of printing an image upon an object.
Claim 8
Dependent Claim
11 words
An object printed in accordance with the method of claim 6.
Claim 9
Independent Claim
90 words
A method of reproducing an image which has been printed using periodic half-tone images, comprising the step of converting an image into at least one improved half-tone image; said improved half-tone image having areas to be substantially filled with color and said areas to be substantially free from color arrayed substantially in accordance with a pattern comprising a plurality of identifiable elements, the intervals between said elements and the frequencies with which said elements appear being described by ratios which cannot be expressed as the ratio of two whole numbers.
Claim 10
Independent Claim
90 words
A method of reproducing an image which has been printed using periodic half-tone images, comprising the step of converting an image into at least one improved half-tone image; said improved half-tone image having areas to be substantially filled with color and said areas to be substantially free from color arrayed substantially in accordance with a pattern comprising a plurality of identifiable elements, the intervals between said elements and the frequencies with which said elements appear being described by ratios which cannot be expressed as the ratio of two whole numbers.
Claim 11
Dependent Claim
17 words
The method of claim 8, further comprising the step of providing a plurality of improved half-tone images.
Claim 12
Dependent Claim
16 words
The method of claim 9, further comprising the step of successsively overlaying said improved half-tone images.
Claim 13
Dependent Claim
22 words
The method of claim 10, wherein said method of reproducing an image is a method of printing an image upon an object.
Claim 14
Dependent Claim
11 words
An object printed in accordance with the method of claim 11.
Claim 15
Dependent Claim
23 words
The method of claim 8, wherein in said method of reproducing an image is a method of printing an image upon an object.
Claim 16
Dependent Claim
11 words
An object printed in accordance with the method of claim 13.
Claim 17
Dependent Claim
100 words
In a method of printing an image upon an object comprising the step of converting a continuous tone image into at least one half-tone image having areas to be substantially filled with color and areas to be substantially free from color, the improvement wherein said areas to be substantially filled with color and areas to be substantially free from color are arrayed substantially in accordance pattern comprising a plurality of identifiable elements, the intervals between said elements and the frequencies with which said elements appear being described by ratios which cannot be expressed as the ratio of two whole numbers.
Claim 18
Dependent Claim
100 words
In a method of printing an image upon an object comprising the step of converting a continuous tone image into at least one half-tone image having areas to be substantially filled with color and areas to be substantially free from color, the improvement wherein said areas to be substantially filled with color and areas to be substantially free from color are arrayed substantially in accordance pattern comprising a plurality of identifiable elements, the intervals between said elements and the frequencies with which said elements appear being described by ratios which cannot be expressed as the ratio of two whole numbers.
Claim 19
Dependent Claim
16 words
The method of claim 15, further comprising the step of creating a plurality of half-tone images.
Claim 20
Dependent Claim
19 words
The method of claim 16, further comprising the step of successively overlaying each of said plurality of half-tone images.
Claim 21
Dependent Claim
11 words
An object printed in accordance with the method of claim 15.
Claim 22
Dependent Claim
11 words
An object printed in accordance with the method of claim 17.
Claim 23
Independent Claim
126 words
A method of reproducing an image, comprising the steps of: (a) providing an original image to be reproduced; (b) scanning said image to create a digital representation of said original image; (c) converting said digital representation of said original image into a pattern comprised of discrete areas to be substantially filled with a color and discrete areas to be substantially free from color wherein said areas are arrayed substantially in accordance with a pattern comprising a plurality of identifiable elements, the intervals between said elements and the frequencies with which said elements appear being described by ratios which cannot be expressed as the ratio of two whole numbers; (d) transferring said pattern to reproduction means; whereby said reproduction means is used to create a half-tone image.
Claim 24
Independent Claim
126 words
A method of reproducing an image, comprising the steps of: (a) providing an original image to be reproduced; (b) scanning said image to create a digital representation of said original image; (c) converting said digital representation of said original image into a pattern comprised of discrete areas to be substantially filled with a color and discrete areas to be substantially free from color wherein said areas are arrayed substantially in accordance with a pattern comprising a plurality of identifiable elements, the intervals between said elements and the frequencies with which said elements appear being described by ratios which cannot be expressed as the ratio of two whole numbers; (d) transferring said pattern to reproduction means; whereby said reproduction means is used to create a half-tone image.
Claim 25
Dependent Claim
46 words
The method of claim 20, further comprising the steps of: (a) creating a plurality of said half-tone images; (b) successively printing an image from each of said half tone images; whereby each said successively printed images are overlaid to form a reproduction of said original image.
References Cited (Backward Citations)
US4566042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |