Position measurement system
First Claim
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1. A position measurement system comprising:
- an indicator that projects light of a concentric interference pattern;
a detector that detects the light of the interference pattern projected by the indicator; and
a computing device that determines positional coordinates of a center of light of an interference pattern projected onto a target object on a basis of a signal obtained from the detector, the computing device removing noise from the determined positional coordinates to compute first positional coordinate values, the computing device again removing noise from the first positional coordinate values using a noise removal parameter determined on a basis of the first positional coordinate values to compute second positional coordinate values, the computing device determining an indicated position of the indicator on a basis of the second positional coordinate values.
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Abstract
A position measurement system for measuring positional coordinates of a point under measurement includes a first noise removal unit, a parameter determination unit and a second noise removal unit. The first noise removal unit removes noise from the measured positional coordinates to acquire first positional coordinate values. The parameter determination unit determines a noise removal parameter on a basis of the first positional coordinate values. The second noise removal unit again removes noise from the first positional coordinate values with using the noise removal parameter, to acquire second positional coordinate values.
23 Citations
4 Claims
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1. A position measurement system comprising:
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an indicator that projects light of a concentric interference pattern; a detector that detects the light of the interference pattern projected by the indicator; and a computing device that determines positional coordinates of a center of light of an interference pattern projected onto a target object on a basis of a signal obtained from the detector, the computing device removing noise from the determined positional coordinates to compute first positional coordinate values, the computing device again removing noise from the first positional coordinate values using a noise removal parameter determined on a basis of the first positional coordinate values to compute second positional coordinate values, the computing device determining an indicated position of the indicator on a basis of the second positional coordinate values. - View Dependent Claims (2, 3, 4)
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Specification
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Current AssigneeFuji Xerox Company Limited (Xerox Holdings Corp.)
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Original AssigneeFuji Xerox Company Limited (Xerox Holdings Corp.)
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InventorsYamaguchi, Yoshinori, Saguchi, Yasuyuki, Seko, Yasuji
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Primary Examiner(s)Toatley, Jr.; Gregory J
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Assistant Examiner(s)Richey; Scott M
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Application NumberUS12/458,867Publication NumberTime in Patent Office410 DaysField of Search356/498, 356/499US Class Current356/498CPC Class CodesG01B 11/002 for measuring two or more c...
