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<p>The effect of the shape and size of a standard feature (fiducial) on the positional accuracy of the centroid in machine-vision applications is studied. It is shown that a circular fiducial provides superior subpixel registration accuracy among the fiducial shapes typically used today.</p>
fiducials; machine vision; shape; size; standard feature; centroid; subpixel registration accuracy; computer vision; computerised pattern recognition
I. Amir, C.B. Bose, "Design of Fiducials for Accurate Registration Using Machine Vision", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 12, no. , pp. 1196-1200, December 1990, doi:10.1109/34.62609
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