Simple Field-of-View Calibration Procedure for High Fidelity Photogrammetry
Abstract
This report introduces a simple and straightforward field-of-view calibration procedure for fixed-view cameras to be used for U.S. Army weapons testing. This method will significantly improve the accuracy of photogrammetric measurements for both two-dimensional and three-dimensional (3D) applications by correcting for image skew and large-scale, non-spherical image distortions. The process makes use of a sub-pixel reference point selection technique in camera images, and precision surveyed points in 3D, allowing a more accurate affine transform to be generated between image coordinates and their projection onto a calibration plane in 3D coordinates. Although not necessary, the process can be made even more accurate by first conducting a conventional camera/lens calibration procedure to account for spherical aberrations. Given the simplicity of this approach and the advantages it provides, it is recommended to use this procedure at all U.S. Army tests where high-fidelity measurements are required from video collected with fixed-view cameras systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 2019
- Accession Number
- AD1083571
Entities
People
- Ryan Decker
- Steven Manole