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Area of Science:

  • Metrology
  • Geomatics Engineering
  • Computer Vision

Background:

  • Terrestrial Laser Scanners (TLSs) are crucial for large-scale applications like reverse engineering and surveying.
  • Contrast targets aid TLS in scene registration and scale establishment.
  • Existing algorithms for calculating centers of contrast targets (CCT) lack precision, accuracy, and are often proprietary.

Purpose of the Study:

  • To develop a novel, precise, and accurate algorithm for calculating CCT.
  • To overcome limitations of existing proprietary algorithms for CCT calculation.
  • To provide an open and robust solution for TLS data processing.

Main Methods:

  • A new algorithm for CCT calculation was developed at the National Institute of Standards and Technology (NIST).
  • Multiple contrast targets were scanned in various orientations using a TLS.
  • CCTs were calculated using both the NIST algorithm and proprietary Original Equipment Manufacturer (OEM) software for comparison.

Main Results:

  • The NIST algorithm demonstrated robustness and addressed several data quality issues.
  • In most cases, the NIST algorithm exhibited superior precision compared to the OEM software.
  • The NIST algorithm provides a reliable alternative for CCT determination in TLS applications.

Conclusions:

  • The developed NIST algorithm offers a precise and accurate method for CCT calculation.
  • This novel algorithm enhances the usability and reliability of TLS data.
  • The NIST algorithm represents a significant advancement over existing proprietary solutions for TLS data processing.