Pattern recognition system with improved recognition rate using nonlinear transformation
First Claim
1. A pattern recognition system for identifying an input pattern with one of a plurality of prescribed recognizable categories for patterns, comprising:
- pattern input means for inputting the input pattern to be recognized;
feature extraction means for extracting a feature vector from the input pattern inputted by the pattern input means;
nonlinear transformation means for applying a nonlinear transformation for each of said prescribed recognizable categories to the feature vector extracted by the feature extraction means to obtain a transformed feature data for the input pattern for each of said prescribed recognizable categories, where the nonlinear transformation for each of said prescribed recognizable categories maps linearly inseparable distributions in a vector space containing the feature vector onto separable distributions; and
matching means for comparing the transformed feature data for the input pattern for each of said prescribed recognizable categories with a corresponding reference feature model for each of said prescribed recognizable categories indicating a feature vector distribution for each of said prescribed recognizable categories, for finding a category of the input pattern as that of the reference feature model for one of said prescribed recognizable categories that is closest to the transformed feature data for the input pattern for said one of said prescribed recognizable categories.
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Abstract
A pattern recognition system capable of handling the non-Gaussian feature vector distribution in the feature vector space such that the recognition rate can be improved while using the pattern matching based on the assumption of the Gaussian feature vector distribution. In the system, a nonlinear transformation for each recognizable category is applied to the feature vector extracted from the input pattern to be recognized, to obtain a transformed feature data for the input pattern, where the nonlinear transformation maps linearly inseparable distributions in a vector space containing the feature vector onto linearly separable distributions. Then, the transformed feature data for the input pattern is compared with reference feature model for each recognizable category indicating a feature vector distribution for each category, to find a category of the input pattern as that of the reference feature model closest to the transformed feature data for the input pattern.
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Citations
22 Claims
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1. A pattern recognition system for identifying an input pattern with one of a plurality of prescribed recognizable categories for patterns, comprising:
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pattern input means for inputting the input pattern to be recognized; feature extraction means for extracting a feature vector from the input pattern inputted by the pattern input means; nonlinear transformation means for applying a nonlinear transformation for each of said prescribed recognizable categories to the feature vector extracted by the feature extraction means to obtain a transformed feature data for the input pattern for each of said prescribed recognizable categories, where the nonlinear transformation for each of said prescribed recognizable categories maps linearly inseparable distributions in a vector space containing the feature vector onto separable distributions; and matching means for comparing the transformed feature data for the input pattern for each of said prescribed recognizable categories with a corresponding reference feature model for each of said prescribed recognizable categories indicating a feature vector distribution for each of said prescribed recognizable categories, for finding a category of the input pattern as that of the reference feature model for one of said prescribed recognizable categories that is closest to the transformed feature data for the input pattern for said one of said prescribed recognizable categories. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of pattern recognition for identifying an input pattern with one of a plurality of prescribed recognizable categories for patterns, comprising the steps of:
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(a) inputting the input pattern to be recognized; (b) extracting a feature vector from the input pattern inputted at the step (a); (c) applying a nonlinear transformation for each of said prescribed recognizable categories to the feature vector extracted at the step (b) to obtain a transformed feature data for the input pattern for each of said prescribed recognizable categories, where the nonlinear transformation for each of said prescribed recognizable categories maps linearly inseparable distributions in a vector space containing the feature vector onto linearly separable distributions; and (d) comparing the transformed feature data for the input pattern for each said prescribed recognizable categories with a corresponding reference feature model for each of said prescribed recognizable categories indicating a feature vector distribution for each of said prescribed recognizable categories, for finding a category of the input pattern as that of the reference feature model for one of said prescribed recognizable categories that is closest to the transformed feature data for the input pattern for said one of said prescribed recognizable categories. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification