Pattern recognition apparatus and a pattern recognition method
First Claim
1. A pattern recognition apparatus comprising:
- an image pickup section for picking up an image of patterns;
a pretreated circuit for converting an output signal of said image pickup section into image pattern data consisting of binary-coded signals;
a pattern memory circuit having N×
M addresses for storing N×
M bits of said image pattern data, where M and N are integers;
a reference pattern memory circuit having at least n×
m addresses for storing reference pattern data consisting of n×
m bits of a reference pattern, where m and n are integers smaller than M and N respectively;
a first correlation calculating circuit for calculating first correlations between sub-images each consisting of n×
m bits of said image pattern data and said reference pattern data, respectively, each of said first correlations being expressed as R(X), where X is a variable factor representing a memory region storing one of said image pattern data sub-images in said pattern memory circuit; and
a second correlation calculating means for recognizing the position of a pattern most identical to said reference pattern, by emphasizing the maximum value of said first correlations by converting each of said first correlations R(X) into a second correlation expressed as [R(X)-R(X-α
)]-[R(X+α
)×
R(X)], where α
is a predetermined value determined in accordance with the size of said reference pattern data.
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Abstract
A pattern recognition apparatus and method, the apparatus comprising a correlation calculating circuit for calculating first correlations between each part of a image pattern data and a reference pattern data, the first correlation being expressed as R(X), where X is a variable factor representing a region storing the part of the image pattern data, and also comprising a second correlation calculating circuit for recognizing the position of a pattern most identical to the reference pattern by emphasizing the maximum value of the first correlations by converting each of the first correlations R(X) into a second correlation expressed as [R(X)-R(X-α)]-[R(X+α)-R(X)], where α is a predetermined value determined in accordance with the size of the reference pattern data.
84 Citations
15 Claims
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1. A pattern recognition apparatus comprising:
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an image pickup section for picking up an image of patterns; a pretreated circuit for converting an output signal of said image pickup section into image pattern data consisting of binary-coded signals; a pattern memory circuit having N×
M addresses for storing N×
M bits of said image pattern data, where M and N are integers;a reference pattern memory circuit having at least n×
m addresses for storing reference pattern data consisting of n×
m bits of a reference pattern, where m and n are integers smaller than M and N respectively;a first correlation calculating circuit for calculating first correlations between sub-images each consisting of n×
m bits of said image pattern data and said reference pattern data, respectively, each of said first correlations being expressed as R(X), where X is a variable factor representing a memory region storing one of said image pattern data sub-images in said pattern memory circuit; anda second correlation calculating means for recognizing the position of a pattern most identical to said reference pattern, by emphasizing the maximum value of said first correlations by converting each of said first correlations R(X) into a second correlation expressed as [R(X)-R(X-α
)]-[R(X+α
)×
R(X)], where α
is a predetermined value determined in accordance with the size of said reference pattern data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A pattern recognition method comprising the steps of:
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picking up an image of patterns, converting the picked-up image into image pattern data consisting of binary-coded signals, storing N×
M bits of said image pattern data, where M and N are integers;storing reference pattern data consisting of at least n×
m bits of a reference pattern, where m and n are integers smaller than M and N, respectively;calculating first correlations between sub-images each consisting of n×
m bits of said image pattern data and said reference pattern data, respectively each of said first correlations being expressed as R(X), where X is a variable factor representing a region storing one of said second parts; andrecognizing the position of a pattern most identical to said reference pattern, by emphasizing the maximum value of said first correlations by converting each of said first correlations R(X) into a second correlation expressed as [R(X)-R(X-α
)]-[R(X+α
)-R(X)], where α
is a predetermined value determined in accordance with the size of said reference pattern data. - View Dependent Claims (12, 13, 14, 15)
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Specification