US3701095A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visual feature extraction system for characters and patterns
Assignee: Japan Broadcasting Corp
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Filing: 1970-09-14
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Granted: 1972-10-24
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Expires: 1990-09-14
Abstract
Abstract A visual feature extraction system comprising electric circuit models having a similar construction with the visual system of higher animals. The system comprises analog threshold elements as the corresponding elements to visual neuron cells. An analog threshold element is composed in a manner that to each of a plurality of its inputs an interconnecting coefficient is allocated respectively and if an algebraic sum of all of the inputs is positive, a weighted sum of the inputs is derived as the output, and if the algebraic sum is negative, the output becomes zero. The system is composed by such elements connected to form multilayered parallel network, wherein each layer recognizes one of features such as, contrast, dot, line component of simple type, line component of complex type, end of line, curved portion and curvature, and the layers are interconnected with a predetermined interconnecting characteristics between each other so as to detect the linear portion, the curved portion, etc. of an input pattern.
Inventors
- 👤 Yukiya Yamaguchi
- 👤 Kunihiko Fukushima
- 👤 Minoru Yasuda
- 👤 Shojiro Nagata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:23
CPC Classifications
G; G06; G06V; G06V30/00; G06V30/10; G06V30/18; G06V30/1801; G06V30/18019; G06V30/18038
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
277 words
A visual feature extraction system comprising in combination at least a photoreceptor layer, a contrast detecting layer, a line component detecting layer, a curved portion detecting layer and a curvature detecting layer, wherein said photoreceptor layer consists of a two-dimensional array of a number of photosensitive elements, said contrast detecting layer consists of a twodimensional array of a number of non-linear analog threshold elements and is interconnected to said photoreceptor layer in a cascade mode, said line component detecting layer is formed by a plurality of combined sets, each set of which is formed by a simple type line detecting layer and a complex type detecting layer connected thereto with a predetermined characteristic, each layer of each set having the same configuration as the contrast detecting layer, and when a surface of said line component detecting layer is expressed by orthogonal axes xi and Eta , said layers are interconnected in parallel with said contrast detecting layer with these axes being successively equi-angularly deviated about their center of the axes, said curved portion detecting layer consists of a plurality of layers each of which has the same structure as that of said contrast detecting layer and is interconnected to said line component detecting in a cascade mode, and said curvature detecting layer consists of a layer having the same structure as that of said contrast detecting layer and is interconnected in parallel with said curved portion detecting layer so as to receive an output from each of a plurality of layers of said curved portion detecting layer in a parallel mode, whereby the interconnecting characteristics between said layers are determined in accordance with the desired detecting purposes.
Claim 2
Dependent Claim
277 words
A visual feature extraction system comprising in combination at least a photoreceptor layer, a contrast detecting layer, a line component detecting layer, a curved portion detecting layer and a curvature detecting layer, wherein said photoreceptor layer consists of a two-dimensional array of a number of photosensitive elements, said contrast detecting layer consists of a twodimensional array of a number of non-linear analog threshold elements and is interconnected to said photoreceptor layer in a cascade mode, said line component detecting layer is formed by a plurality of combined sets, each set of which is formed by a simple type line detecting layer and a complex type detecting layer connected thereto with a predetermined characteristic, each layer of each set having the same configuration as the contrast detecting layer, and when a surface of said line component detecting layer is expressed by orthogonal axes xi and Eta , said layers are interconnected in parallel with said contrast detecting layer with these axes being successively equi-angularly deviated about their center of the axes, said curved portion detecting layer consists of a plurality of layers each of which has the same structure as that of said contrast detecting layer and is interconnected to said line component detecting in a cascade mode, and said curvature detecting layer consists of a layer having the same structure as that of said contrast detecting layer and is interconnected in parallel with said curved portion detecting layer so as to receive an output from each of a plurality of layers of said curved portion detecting layer in a parallel mode, whereby the interconnecting characteristics between said layers are determined in accordance with the desired detecting purposes.
Claim 3
Dependent Claim
89 words
A visual feature extraction system as claimed in claim 1, wherein said non-linear analog threshold element forming each of the layers is so constructed to receive outputs from a set of elements within a certain region of receptive field of a preceding layer through an interconnecting coefficient circuit having a characteristic in accordance with a desired detecting purpose and to produce an output corresponding to a value exceeding a given threshold value of a signal of an algebraic sum of said outputs, only when said algebraic sum is positive.
Claim 4
Dependent Claim
108 words
A visual feature extraction system as claimed in claim 2, wherein a receptive field of each of said non-linear analog threshold elements of each of said contrast detecting layer, said line component detecting layer and said curvature detecting layer is so constructed to be overlapped viewed from the photoreceptive surface of said photoreceptor layer to cover whole of said photoreceptive surface and a receptive field of each of the non-linear analog threshold elements of said curved portion detecting layer corresponds to adjacent two to three portions in the direction of a line component detected by the preceding line component detecting layer and is interconnected antagonistically to said portions.
Claim 5
Dependent Claim
61 words
A visual feature extraction system as claimed in claim 3, wherein said non-linear analog threshold element of said curvature detecting layer is so interconnected in parallel with a plurality of layers consisting said curved portion detecting layer as to receive in a summation mode a set of outputs from receptive fields which correspond to the same position on said photoreceptor layer.
References Cited (Backward Citations)
US3496382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |