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US6026188A
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System and method for recognizing a 3-D object by generating a rotated 2-D image of the object from a set of 2-D enrollment images
Assignee: Unisys Corp
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Filing: 1997-10-10
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Granted: 2000-02-15
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Expires: 2017-10-10
Abstract
Abstract A three-dimensional object X is recognized by a method which includes the steps of: a) storing in a memory, a set of two-dimensional enrollment images X1-Xn of the object X as viewed from n different directions; b) acquiring a two-dimensional access image of an unidentified object as viewed from a new direction which lies between the n different directions; c) generating, from the stored set of images, a rotated two-dimensional image of the object X as viewed from a direction which is closer to the new direction than any of the n different directions; and, d) identifying the unidentified object as the object X only if a correlation between the image of the unidentified object and the rotated image exceeds a predetermined threshold. By generating the rotated image, misalignments with the access image of the unidentified object are reduced; and thus the predetermined threshold can be raised to reduce recognition errors.
Inventors
- 👤 Raffi Dionysian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:04
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/60; G06V; G06V10/00; G06V10/70; G06V10/74; G06V10/75; G06V10/751; G06V10/7515; G06V40/00; G06V40/10; G06V40/16; G06V40/172
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
122 words
A method of electronically recognizing a three-dimensional object X; said method including the steps of: storing in a memory, a set of two-dimensional images X 1 -X n of said object X as viewed from at least three different directions; acquiring a two-dimensional image of an unidentified object as viewed from a new direction which lies between said different directions; automatically generating, from said stored set of images, a rotated two-dimensional image of said object X as viewed from a direction which is closer to said new direction than any of said different directions; and, identifying said unidentified object as said object X only if a correlation between said image of said unidentified object and said rotated image exceeds a predetermined threshold.
Claim 2
Independent Claim
122 words
A method of electronically recognizing a three-dimensional object X; said method including the steps of: storing in a memory, a set of two-dimensional images X 1 -X n of said object X as viewed from at least three different directions; acquiring a two-dimensional image of an unidentified object as viewed from a new direction which lies between said different directions; automatically generating, from said stored set of images, a rotated two-dimensional image of said object X as viewed from a direction which is closer to said new direction than any of said different directions; and, identifying said unidentified object as said object X only if a correlation between said image of said unidentified object and said rotated image exceeds a predetermined threshold.
Claim 3
Dependent Claim
73 words
A method according to claim 1 wherein said generating step includes the substeps of: measuring distances between particular features in said image of said unidentified object, and distances between the same features in one of said images X 1 -X n ; and producing said rotated two-dimensional image of said object X by interpolating a subset of said images X 1 -X n as a function of a ratio of the measured distances.
Claim 4
Dependent Claim
18 words
A method according to claim 2 wherein said object X and said unidentified object are a human face.
Claim 5
Dependent Claim
22 words
A method according to claim 3 wherein said particular features include a nose on said face, and the side of said face.
Claim 6
Dependent Claim
22 words
A method according to claim 3 wherein said particular features include a nose on said face, and the top of said face.
Claim 7
Dependent Claim
22 words
A method according to claim 3 wherein said particular features include an eye on said face, and the side of said face.
Claim 8
Dependent Claim
22 words
A method according to claim 3 wherein said particular features include an eye on said face, and the top of said face.
Claim 9
Dependent Claim
29 words
A method according to claim 3 and further including the step of enabling said unidentified object to enter a secure area only if said correlation exceeds said predetermined threshold.
Claim 10
Dependent Claim
48 words
A method according to claim 1 wherein said generating step includes the substeps of: selecting four images in said set which have the largest correlation to said image of said unidentified object; and producing said rotated two-dimensional image of said object X by interpolating the four selected images.
Claim 11
Dependent Claim
48 words
A method according to claim 1 wherein said generating step includes the substeps of: selecting three images in said set which have the largest correlation to said image of said unidentified object; and producing said rotated two-dimensional image of said object X by interpolating the three selected images.
Claim 12
Dependent Claim
18 words
A method according to claim 1 wherein said set of two-dimensional images includes a total of nine images.
Claim 13
Dependent Claim
18 words
A method according to claim 1 wherein said set of two-dimensional images includes a total of five images.
Claim 14
Dependent Claim
18 words
A method according to claim 1 wherein said directions differ from each other by less than thirty degrees.
Claim 15
Dependent Claim
28 words
A method according to claim 1 wherein said set of images of said object X and said image of said unidentified object are in the infrared frequency spectrum.
Claim 16
Dependent Claim
28 words
A method according to claim 1 wherein said set of images of said object X and said image of said unidentified object are in the visible frequency spectrum.
Claim 17
Dependent Claim
133 words
An electronic system for recognizing a three-dimensional object X; said system being comprised of: a memory for storing a set of two-dimensional images X 1 -X n of said object X as viewed from at least three different directions; a camera for acquiring a two-dimensional image of an unidentified object as viewed from a new direction which lies between said different directions; an image rotating means for automatically generating from said stored set of images, a rotated two-dimensional image of said object X as viewed from a direction which is closer to said new direction than any of said different directions; and, a correlating means, for identifying said unidentified object as said object X only if a correlation between said image of said unidentified object and said rotated image exceeds a predetermined threshold.
Claim 18
Dependent Claim
133 words
An electronic system for recognizing a three-dimensional object X; said system being comprised of: a memory for storing a set of two-dimensional images X 1 -X n of said object X as viewed from at least three different directions; a camera for acquiring a two-dimensional image of an unidentified object as viewed from a new direction which lies between said different directions; an image rotating means for automatically generating from said stored set of images, a rotated two-dimensional image of said object X as viewed from a direction which is closer to said new direction than any of said different directions; and, a correlating means, for identifying said unidentified object as said object X only if a correlation between said image of said unidentified object and said rotated image exceeds a predetermined threshold.
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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) | 2003-02-14 | 2003-08-16 | 2004-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-14 | 2007-08-16 | 2008-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-14 | 2011-08-16 | 2012-02-15 | $7700.00 | Window Closed / Lapsed |