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Distortion correction based on off-axis Schwarzschild two-mirror hyperspectral imager.
Optics Express
|October 7, 2021
Summary
A novel distortion correction method for hyperspectral imagers uses polynomial and radial models for improved accuracy. This simple, efficient technique enhances pushbroom hyperspectral imaging applications.
Area of Science:
- Optics and Remote Sensing
- Image Processing
Background:
- Hyperspectral imagers, particularly non-mapping pushbroom types, suffer from distortions.
- Accurate distortion correction is crucial for reliable data analysis in hyperspectral imaging.
Purpose of the Study:
- To propose a new, simple, and efficient distortion correction method for off-axis Schwarzschild two-mirror hyperspectral imagers.
- To address distortions in both the pushbroom and vertical pushbroom directions.
Main Methods:
- Utilizing a polynomial model for distortion in the pushbroom direction, corrected using linear features.
- Employing a radial distortion model for the vertical pushbroom direction, corrected via cross-ratio invariance.
- Comparing the proposed method with traditional precision angle measurement techniques.
Main Results:
- The proposed method demonstrates simplicity and efficiency compared to existing angle measurement methods.
- The technique effectively corrects distortions in hyperspectral pushbroom imagery.
Conclusions:
- The developed distortion correction method is suitable for non-mapping pushbroom hyperspectral imagers.
- This approach offers a practical solution for enhancing the geometric accuracy of hyperspectral data.
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