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US5566245A
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The performance of a printer or an imaging system using transform-based quality measures
Assignee: United Parcel Service of America Inc
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Filing: 1995-05-26
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Granted: 1996-10-15
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Expires: 2015-05-26
Abstract
Abstract A method and apparatus for characterizing the performance of either a printer used to print a two-dimensional symbol or an imaging system used to generate an gray-scale image of the printed symbol. After the image is generated, an acquisition target of the symbol is located. The fast Fourier transform of the gray-scale image is generated and certain hexagon-position quality measures are computed to characterize the quality of the acquisition target.
Inventors
- 👤 Joe Zheng
- 👤 Jiansu Lai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:15
CPC Classifications
G; G06; G06K; G06K5/00; G06K5/02; G06V; G06V10/00; G06V10/98; G06V10/993
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
144 words
A method for characterizing the performance of a device, comprising the following steps: (a) providing a printed symbol, said printed symbol having been generated with a printer, said printed symbol comprising an array of printed polygons; (b) generating a pixel image of said printed symbol with camera; (c) locating an imaged symbol in said image using a computer processor, wherein the imaged symbol comprises an array of imaged polygons; (d) transforming at least a portion of said imaged symbol into a frequency domain using the computer processor; (e) calculating a quality measure in accordance with said transformed portion using the computer processor, wherein the quality measure indicates periodic differences between the imaged polygons and an array of specified polygons; and (f) characterizing the performance of said device in accordance with said quality measure, wherein said device is one of said printer and said camera.
Claim 2
Independent Claim
144 words
A method for characterizing the performance of a device, comprising the following steps: (a) providing a printed symbol, said printed symbol having been generated with a printer, said printed symbol comprising an array of printed polygons; (b) generating a pixel image of said printed symbol with camera; (c) locating an imaged symbol in said image using a computer processor, wherein the imaged symbol comprises an array of imaged polygons; (d) transforming at least a portion of said imaged symbol into a frequency domain using the computer processor; (e) calculating a quality measure in accordance with said transformed portion using the computer processor, wherein the quality measure indicates periodic differences between the imaged polygons and an array of specified polygons; and (f) characterizing the performance of said device in accordance with said quality measure, wherein said device is one of said printer and said camera.
Claim 3
Dependent Claim
50 words
The method of claim 1, wherein step (c)further comprises the step of determining an element angle in said frequency domain, wherein the element angle indicates differences between the imaged polygons and the specified polygons with respect to angles between axes through the centers of the polygons in a spatial domain.
Claim 4
Dependent Claim
51 words
The method of claim 1, wherein step (c) further comprises the step of determining an element position in said frequency domain, wherein the element position indicates differences between the imaged polygons and the specified polygons with respect to distances between axes through the centers of the polygons in a spatial domain.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein the array of printed polygons is an array of printed hexagons.
Claim 6
Independent Claim
140 words
An apparatus for characterizing the performance of a device, comprising: (a) a camera; and (b) a computer processor, wherein: said camera generates a pixel image of said printed symbol, said printed symbol having been generated with a printer, said printed symbol comprising an array of printed polygons; said computer processor locates an imaged symbol in said image, wherein the imaged symbol comprises an array of imaged polygons; said computer processor transforms at least a portion of said imaged symbol into a frequency domain; said computer processor calculates a quality measure in accordance with said transformed portion, wherein the quality measure indicates periodic differences between the imaged polygons and an array of specified polygons; and said computer processor characterizes the performance of said device in accordance with said quality measure, wherein said device is one of said printer and said camera.
Claim 7
Independent Claim
140 words
An apparatus for characterizing the performance of a device, comprising: (a) a camera; and (b) a computer processor, wherein: said camera generates a pixel image of said printed symbol, said printed symbol having been generated with a printer, said printed symbol comprising an array of printed polygons; said computer processor locates an imaged symbol in said image, wherein the imaged symbol comprises an array of imaged polygons; said computer processor transforms at least a portion of said imaged symbol into a frequency domain; said computer processor calculates a quality measure in accordance with said transformed portion, wherein the quality measure indicates periodic differences between the imaged polygons and an array of specified polygons; and said computer processor characterizes the performance of said device in accordance with said quality measure, wherein said device is one of said printer and said camera.
Claim 8
Dependent Claim
47 words
The apparatus of claim 5, wherein said computer processor determines an element angle in said frequency domain, wherein the element angle indicates differences between the imaged polygons and the specified polygons with respect to angles between axes through the centers of the polygons in a spatial domain.
Claim 9
Dependent Claim
47 words
The apparatus of claim 5, wherein said computer processor determines an element position in said frequency domain, wherein the element position indicates differences between the imaged polygons and the specified polygons with respect to distances between axes through the centers of the polygons in a spatial domain.
Claim 10
Dependent Claim
17 words
The apparatus of claim 5, wherein the array of printed polygons is an array of printed hexagons.
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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) | 1999-10-15 | 2000-04-15 | 2000-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-15 | 2004-04-15 | 2004-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-15 | 2008-04-15 | 2008-10-15 | $7700.00 | Window Closed / Lapsed |