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[Geometric distortion correction for hyperspectral image using a rotating scan reflector].

Gang-yang Ke1, Ning An, Yang-chao Tian

  • 1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China. foryy@mail.ustc.edu.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|November 20, 2012
PubMed
Summary

Offner imaging spectrometers capture large objects using a rotating scan. This study derives a projection formula to correct geometric distortion caused by varying object distances, enabling clear hyperspectral image acquisition.

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Area of Science:

  • Optics and Spectroscopy
  • Remote Sensing Technology

Context:

  • Offner imaging spectrometers are pushbroom systems requiring sensor-scene motion.
  • Capturing large objects necessitates techniques like rotating scans.
  • Geometric distortions arise from object distance variations in rotating scans.

Purpose:

  • To derive a space projection formula for Offner imaging spectrometers.
  • To develop a method for correcting geometric distortions in hyperspectral images.
  • To enable accurate 3D reconstruction from rotating scan data.

Summary:

  • A space projection formula was derived relating object points to image points during a single capture.
  • Object point coordinates on a reference plane were determined using the projection relation and slit motion curve with rotation angle as a variable.
  • A rotating scan device with a reflector was designed and integrated into an Offner imaging spectrometer.

Impact:

  • Achieved clear hyperspectral images through a developed correction algorithm.
  • Improved geometric accuracy for large object imaging with Offner spectrometers.
  • Facilitated precise mapping and analysis of large scenes with variable object distances.