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High-accuracy centroid location of CCD imaging retroreflective targets in close-range photogrammetry
Applied Optics- received 01/08/2024; accepted 04/15/2024; posted 04/16/2024; Doc. ID 518097
- Abstract: Depending on the size, shape, and gray intensity distribution of charge-coupled device (CCD) imaging retro-reflectivetargets (RRTs) in close-range photogrammetry, and based on conventional grayscale centroiding, this paper proposesgrayscale threshold variable-index weighted centroiding (GTVIWC). The centroid location accuracy of CCD imaging RRTswas analyzed and compared using simulated and measured target images, respectively. The experimental resultsdemonstrated that the centroid location accuracy of the algorithms used in the experiment was relatively high, reachingthe subpixel level. Among them, GTVIWC has the highest location accuracy. The root mean square error (RMSE) of thecentroid location for the simulated and measured CCD imaging RRTs reaches 0.0011 pixels and 0.0122 pixels,respectively. The correctness, reliability, and high accuracy of the proposed algorithm are verified.