Patent EP0225151A2 successfully refreshed from Google Patents.
EP0225151A2
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EP
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Pattern recognition system
Assignee: International Business Machines Corp
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Filing: 1986-11-25
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Granted: —
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Expires: 2006-11-25
Abstract
Abstract The present invention relates to a pattern recognition system for recognising circular and linear patterns, in a complex image including such circular and linear patterns, of the type which comprise a feature detection system for detecting features and feature values in the image, scanning means for scanning the feature detection system over the image, and detecting means for detecting the circular and linear patterns based on feature values detected by the feature detection system. According to the invention the pattern recognisation system is characterised in that the feature detection system comprises a directional multiple circular window filter including means for enhancing one or more selected directional components of features detected by the filter.
Inventors
- 👤 Shoji Itoh
- 👤 HideoöAbitaiijima 305 Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 00:45
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/40; G06V10/44; G06V10/443
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
100 words
A pattern recognition system for recognising circular and linear patterns, in a complex image including such circular and linear patterns, comprising: a feature detection system for detecting features and feature values (B) in said image, scanning means (10) for scanning said feature detection system over said image, and detecting means (10, 12, 14) for detecting said circular and linear patterns based on feature values detected by said feature detection system, characterised in that said feature detection system comprises a directional multiple circular window filter including means for enhancing one or more selected directional components of features detected by said filter.
Claim 2
Dependent Claim
100 words
A pattern recognition system for recognising circular and linear patterns, in a complex image including such circular and linear patterns, comprising: a feature detection system for detecting features and feature values (B) in said image, scanning means (10) for scanning said feature detection system over said image, and detecting means (10, 12, 14) for detecting said circular and linear patterns based on feature values detected by said feature detection system, characterised in that said feature detection system comprises a directional multiple circular window filter including means for enhancing one or more selected directional components of features detected by said filter.
Claim 3
Dependent Claim
46 words
A pattern recognition system as claimed in claim 1 characterised in that said directional multiple circular window filter uses a triple circular window filter for said circular patterns and enhances the directional components other than the maximum directional component of said features detected by said filter.
Claim 4
Dependent Claim
46 words
A pattern recognition system as claimed in claim 2, characterised in that said detection means searches for the maximum value of said feature values and detects a circular pattern within a predetermined area centred at the position corresponding to the position of said maximum feature value.
Claim 5
Dependent Claim
33 words
A pattern recognition system as claimed in claim 3, characterised in that said detection means is adapted to detect circular patterns which are shadows of candidates of lung cancers in a chest radiograph.
Claim 6
Dependent Claim
40 words
A pattern recognition system as claimed in claim 1 characterised in that said directional multiple circular window filter uses a double circular window filter for said linear patterns and enhances the maximum directional component of features detected by said filter.
Claim 7
Dependent Claim
24 words
A pattern recognition system as claimed in claim 5, characterised in that said detection means binary digitises said feature values with a predetermined threshold.
Claim 8
Dependent Claim
31 words
A pattern recognition system as claimed in claim 6, characterised in that said detection means is adapted to detect linear patterns which are shadows of blood vessels in a chest radiograph.
Claim 9
Dependent Claim
66 words
A pattern recognition system as claimed in claim 1, characterised in that said multiple circular window filter comprises at least two concentric circles, each annular region encircled by said concentric circles being equally divided into a plurality of segments, and the average concentration value of the picture elements located within each of said segments and the innermost circle being used as a feature to be detected.
References Cited (Backward Citations)
No citation records indexed.
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