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US 4,543,660 AGranted
Pattern features extracting apparatus and method
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorKen-ichi Maeda
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Abstract
A plurality of different mask pattern data which are indicated by values obtained from Hermitte's polynomials of different degrees weighted by a Gaussian function are stored in mask memories, respectively. Each mask pattern data stored in each of the mask memories is convolved by a sum-of-product circuit together with unknown input pattern data. A plurality of extracted pattern feature data are stored in pattern feature memories.
Claims11
A pattern features extracting apparatus comprising:
- a plurality of mask memories for storing a plurality of different mask pattern data whose values are obtained from Hermite's polynomials weighted by a Gaussian function;
- an input pattern memory for storing unknown input pattern data;
- means for accessing data in a predetermined area of said input pattern memory including a given position of the unknown input pattern;
- and
- means for convolving the data accessed corresponding to the unknown input pattern data using the plurality of different mask pattern data in said plurality of mask memories.
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A Pattern recognition system comprising:
- a plurality of mask memories for storing a plurality of different mask pattern data whose values are obtained from Hermite's polynomials weighted by a Gaussian function;
- an input means for inputting unknown input pattern data;
- means for convolving the mask pattern data and unknown input pattern data;
- means for storing output data from said convolving means in a matrix form;
- means for calculating a multiple similarity for each output data stored in said matrix storing means;
- and
- means for recognizing the unknown input pattern in accordance with the multiple similarity.
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Dependencies are inferred from the claim text.