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US3993976A
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Method and apparatus for pattern analysis
Assignee: United States Department of the Air Force
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Filing: 1974-05-13
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Granted: 1976-11-23
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Expires: 1994-05-13
Abstract
Abstract A technique and apparatus for two dimensional pattern analysis utilizing a transform of the pattern enables the extraction of desired pattern information by means of spatial filtering in accordance with known human visual system processing. Two dimensional spatial frequencies resulting from the transform are acted on by either anisotropic or uniquely used conventional filters to extract one, two and three dimensional pattern information from spatial frequency subsets to determine general form, edge, texture and depth information for detection, identification and classification of objects in simple or complex scenes.
Inventors
- 👤 Arthur P. Ginsburg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:47
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/88; G06V10/92
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
Apparatus for analyzing a two dimensional pattern comprising, means for transforming the pattern into a spatial frequency domain to relate harmonically the elements forming the pattern information, means for filtering the transformed pattern substantially in accordance with the anisotropic attenuation characteristics of the human visual system, and means for bandpass filtering the filtered transform to extract spatial frequency subsets from the said filtered transform for feature analysis.
Claim 2
Dependent Claim
67 words
Apparatus for analyzing a two dimensional pattern comprising, means for transforming the pattern into a spatial frequency domain to relate harmonically the elements forming the pattern information, means for filtering the transformed pattern substantially in accordance with the anisotropic attenuation characteristics of the human visual system, and means for bandpass filtering the filtered transform to extract spatial frequency subsets from the said filtered transform for feature analysis.
Claim 3
Dependent Claim
36 words
An apparatus as defined in claim 1 wherein said feature analysis is obtained by correlation of said spatial filter subsets with stored information or for inverse transform and reconstructing band spatial frequency subsets for further analysis.
Claim 4
Dependent Claim
40 words
A static, single stage, two dimensional, anisotropic, spatial frequency magnitude filter having spatial frequency attenuation characteristics corresponding substantially to the average contrast sensitivity of the human physiological visual system resolution at particular ambient light conditions over 360° of viewing angle.
Claim 5
Dependent Claim
40 words
A static, single stage, two dimensional, anisotropic, spatial frequency magnitude filter having spatial frequency attenuation characteristics corresponding substantially to the average contrast sensitivity of the human physiological visual system resolution at particular ambient light conditions over 360° of viewing angle.
References Cited (Backward Citations)
US3563634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |