Method for producing a standard pattern for pattern matching
First Claim
1. A method of producing a standard pattern comprising:
- successively selecting and storing in a memory of plurality of local patterns different in position and equal in size to a standard pattern to be obtained from an image of an object being examined;
obtaining a distribution of pattern detail in picture elements constituting each local pattern; and
chosing a standard pattern from said plurality of local patterns which has a distribution of pattern detail in picture elements most closely in conformity with a predetermined distribution of pattern detail.
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Abstract
This invention provides a method and apparatus for automatically producing a standard pattern for local pattern matching. According to the present invention, local patterns equivalent in size to a standard pattern to be obtained are successively removed from the image of an object being examined to prepare standard pattern candidates. Evaluation values representing appropriateness as a standard pattern are obtained from the local patterns successively removed or the local patterns together with the image of the object being examined. The evaluation values are used in an evaluation function expressing the uniqueness of the standard pattern and in an auxiliary evaluation function as an aid to the former. The standard pattern is selected using such evaluation values.
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Citations
9 Claims
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1. A method of producing a standard pattern comprising:
- successively selecting and storing in a memory of plurality of local patterns different in position and equal in size to a standard pattern to be obtained from an image of an object being examined;
obtaining a distribution of pattern detail in picture elements constituting each local pattern; and
chosing a standard pattern from said plurality of local patterns which has a distribution of pattern detail in picture elements most closely in conformity with a predetermined distribution of pattern detail. - View Dependent Claims (2, 3, 4, 5)
- successively selecting and storing in a memory of plurality of local patterns different in position and equal in size to a standard pattern to be obtained from an image of an object being examined;
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6. A method of production of a standard pattern comprising the steps:
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inputting an image of an object and storing the image; successively selecting and storing in a memory a plurality of local patterns equal in size to a standard pattern to be produced from said stored image and making each local pattern a standard pattern candidate; obtaining a value of minimum matching errors between each of said standard pattern candidates and each of one or more additional local patterns, each of the one or more additional local patterns being obtained from a different part of the image than from where the local patterns were selected, and being equal in size to said standard pattern candidates from within said image; selecting the standard pattern from the standard pattern candidates based upon which of the standard pattern candidates has a largest value of minimum matching errors obtained for each standard pattern candidate; the plurality of said standard pattern candidates being selected from a plurality of local patterns successively selected from the stored image screened by a judgement that said standard pattern candidates are appropriate as a standard pattern based on data in only said local patterns from which said standard pattern candidates are made; and wherein said appropriateness of each of said standard pattern candidates is determined by whether or not a distribution of standard pattern detail in picture elements constituting said standard pattern is most closely in conformity with a predetermined distribution of pattern detail. - View Dependent Claims (7, 8, 9)
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Specification