US6064768A
Expired / Lapsed
US
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Multiscale feature detector using filter banks
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1997-06-30
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Granted: 2000-05-16
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Expires: 2017-06-30
Abstract
Abstract A detector system locates a feature in an input signal. The input signal is applied to a multiscale filter bank which produces a corresponding set of filtered signals that are applied to a multiscale detector. A scale space tree table is produced by the detector which indicates the location in each filtered signal where the feature is possibly located. A MAP correlator examines the scale space tree table to determine which indications therein are feature locations. One-dimensional and two-dimensional embodiments are described. In addition, the design framework is disclosed for extending a one scale filter to a multiscale filter, for designing a filter bank from the multiscale filter and for designing the MAP correlator dependent on the feature being located and the chosen filter bank.
Inventors
- 👤 Hazem M. Hajj
- 👤 Roland T. Chin
- 👤 Truong Q. Nguyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:02
CPC Classifications
G; G06; G06T; G06T5/00; G06T5/20; G06V; G06V10/00; G06V10/40; G06V10/44; G06V10/443
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
A detector system for locating a feature in an input signal, the combination comprising: a multiscale filter which applies a filter operator to the input signal to produce a plurality of filtered output signals at a corresponding plurality of scales; a multiscale detector which receives the filtered output signals and produces a table which indicates the possible locations in the input signal of the detected feature therein; and a MAP correlator which examines the table and correlates the values therein at each indicated feature location with a model response, said MAP correlator producing an output signal indicating the location of the feature if the correlation exceeds a preset threshold.
Claim 2
Dependent Claim
109 words
A detector system for locating a feature in an input signal, the combination comprising: a multiscale filter which applies a filter operator to the input signal to produce a plurality of filtered output signals at a corresponding plurality of scales; a multiscale detector which receives the filtered output signals and produces a table which indicates the possible locations in the input signal of the detected feature therein; and a MAP correlator which examines the table and correlates the values therein at each indicated feature location with a model response, said MAP correlator producing an output signal indicating the location of the feature if the correlation exceeds a preset threshold.
Claim 3
Dependent Claim
25 words
The detector system as recited in claim 1 in which the input signal is a two-dimensional image and the output signals form a bit map.
Claim 4
Dependent Claim
43 words
The detector system as recited in claim 1 in which the multiscale detector includes a feature signature generator which produces the table by forming a scale space tree from the corresponding locations in each filtered output signal at which the feature is detected.
Claim 5
Dependent Claim
26 words
The detector system as recited in claim 1 in which the multiscale filter is a filter bank comprised of a set of series connected filter stages.
Claim 6
Dependent Claim
55 words
The detector system as recited in claim 4 in which each filter stage includes a convolver which receives the input signal and convolves it with a filter kernel, and in which the first filter bank stage employs a filter kernel H 1 and the remaining filter bank stages employ a filter kernel H 0 .
Claim 7
Dependent Claim
29 words
The detector system as recited in claim 1 in which the input signal is a series of two-dimensional images and the output signals form a series of bit maps.
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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) | 2003-05-16 | 2003-11-15 | 2004-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-16 | 2007-11-15 | 2008-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-16 | 2011-11-15 | 2012-05-16 | $7700.00 | Window Closed / Lapsed |