Pattern recognition system
First Claim
1. A pattern recognition system for extracting circular or linear components separately from a complex image including circular and linear components, said system comprising:
- means for calculating feature values including (a) a directional multiple circular window filter which extracts a feature value for a given position of the complex image, (b) means for scanning various positions of the complex image with said filter and (c) means for enhancing at least one selected directional component of feature values extracted with said filter; and
means for detecting said circular or linear components based on said feature values calculated by said calculating means.
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Abstract
The present invention relates to apparatus for separately extracting circular and linear components in a complex image, the apparatus comprising: (a) a circular filter means for covering a portion of the complex image by filter blocks, wherein the filter blocks comprise a center block and at least one set of blocks angularly disposed to encircle the center block; (b) a first calculator element for computing average image concentration value for each of a plurality of directions with said circular filter means covering a subject portion of the complex image, wherein the concentration value for one directional component is a maximum; (c) a second calculator element for computing a first feature S in which the values of the directional components are evaluated with maximum directional component being enhanced; (d) a third calculator element for computing a second feature value S'"'"' in which the values of the directional components are evaluated with the maximum directional component being weakened; and (e) a mode selector for selectively applying (i) the first feature value S to detect linear image components and (ii) the second feature value S'"'"' to detect circular image components.
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Citations
15 Claims
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1. A pattern recognition system for extracting circular or linear components separately from a complex image including circular and linear components, said system comprising:
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means for calculating feature values including (a) a directional multiple circular window filter which extracts a feature value for a given position of the complex image, (b) means for scanning various positions of the complex image with said filter and (c) means for enhancing at least one selected directional component of feature values extracted with said filter; and means for detecting said circular or linear components based on said feature values calculated by said calculating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for separately extracting circular and linear components in a complex image, the apparatus comprising:
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circular filter means for covering a portion of the complex image by filter blocks, wherein the filter blocks comprise a center block and at least one set of blocks angularly disposed to encircle the center block; means for computing average image concentration value for each of a plurality of directions with said circular filter means covering a subject portion of the complex image, wherein the concentration value for one directional component is a maximum; means for computing a first feature value S in which the values of the directional components are evaluated with the maximum directional component being enhanced; means for computing a second feature value S'"'"' in which the values of the directional components are evaluated with the maximum directional component being weakened; and means for selectively applying (a) the first feature value S to detect linear image components and (b) the second feature value S'"'"' to detect circular image components. - View Dependent Claims (10, 12, 14)
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- 11. 2. Otherwise, S=0.
Specification