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A Convenient Calibration Method for LRF-Camera Combination Systems Based on a Checkerboard.

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A new calibration method simplifies high-precision measurement for laser rangefinder (LRF)-camera systems. This technique accurately calibrates 1D, 2D, and 3D LRF-camera systems using minimal data and a calibration board.

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Area of Science:

  • Optics and Photonics
  • Computer Vision
  • Metrology

Background:

  • Laser rangefinder (LRF)-camera combined measurement systems are widely used in various applications.
  • Accurate calibration is crucial for the performance of these integrated systems.
  • Existing calibration methods can be complex and time-consuming.

Purpose of the Study:

  • To propose a simple, easy, and high-precision calibration method for LRF-camera systems.
  • To develop a calibration technique applicable to 1D, 2D, and 3D LRF-camera configurations.
  • To validate the method's accuracy and effectiveness through simulations and real-world experiments.

Main Methods:

  • Utilizes a calibration board to acquire at least three sets of data.
  • Decouples camera parameters and distortion coefficients using the distortion center.
  • Solves for laser spot spatial coordinates via line and plane constraints to estimate extrinsic parameters.
  • Establishes a cost function for system optimization.

Main Results:

  • The proposed method demonstrates high precision in calibrating LRF-camera systems.
  • It is effective for various LRF-camera types, including newly developed 1D systems.
  • Simulation experiments confirm the method's accuracy and characteristics.
  • Real system calibration validates the practical applicability of the technique.

Conclusions:

  • The developed method offers a simple and efficient approach to LRF-camera calibration.
  • It provides a reliable solution for achieving high-precision measurements.
  • The technique's versatility makes it suitable for a broad range of LRF-camera applications.