Subpixel registration using a concentric ring fiducial

摘要

An examination of the effects of spatial sampling and image noiseon the precision with which the centroids of different geometric shapescan be determined is presented. The concentric ring fiducial-abull's-eye pattern-is identified as having desirable qualities of highlocation precision and rotational invariance. The performance of theconcentric fiducial, as a function of diameter, number of rings. andring spacing, has been tested, and these results are shown