Abstract
A new optoelectronic system based on a projection unit in which light, coming from a laser diode coupled to an optic fiber impinges on a diffractive optical element (DOE) to produce sinusoidal fringes is proposed for three-dimensional (3-D) texture measurement. If the projected fringe pattern is viewed at an angle different from the projection angle, the fringe profile is phase-modulated by the 3-D object shape. The 3-D map information is obtained with the aid of a fringe analyzer based on phase-shifting synthetic moiré pattern, Fast Fourier Transform (FFT), signal demodulation techniques and a robust and fast phase unwrapping performed by a specially developed software. The proposed system is based on a simple and low cost equipment; furthermore, it is suitable for in situ measurements also by nonskilled operators. Some experimental examples illustrate its performance.
Publication types
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Comparative Study
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Evaluation Study
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Research Support, Non-U.S. Gov't
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Validation Study
MeSH terms
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Algorithms
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Anthropology, Cultural / instrumentation
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Anthropology, Cultural / methods
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Archaeology / instrumentation*
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Archaeology / methods
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Archives
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Art*
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Electronics
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Equipment Design
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Equipment Failure Analysis
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Fiber Optic Technology / instrumentation*
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Fiber Optic Technology / methods
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Image Enhancement / instrumentation
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Image Enhancement / methods
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Image Interpretation, Computer-Assisted / instrumentation*
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Image Interpretation, Computer-Assisted / methods
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Imaging, Three-Dimensional / instrumentation*
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Imaging, Three-Dimensional / methods
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Information Storage and Retrieval / methods*
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Models, Statistical
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Pattern Recognition, Automated
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Quality Control
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Reproducibility of Results
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Sensitivity and Specificity
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Signal Processing, Computer-Assisted / instrumentation*