High-precision anamorphic lens calibration with 3D and 2D calibration targets

Area of Science:

• Computer Vision
• Optical Engineering
• Metrology

Background:

• Anamorphic lenses present complex distortion challenges compared to spherical lenses.
• Existing calibration methods struggle with the full field of view and stability for anamorphic systems.

Purpose of the Study:

• To develop a high-precision camera calibration method for anamorphic lenses.
• To address the limitations of existing calibration techniques for anamorphic lens distortion.

Main Methods:

• A polynomial distortion model based on anamorphic aberration theory and numerical experiments was developed.
• Initial calibration was performed using 3D calibration targets.
• Recalibration was conducted using 2D calibration targets to cover the full field of view.

Main Results:

• The proposed method achieves high-precision camera calibration for anamorphic lenses.
• The two-stage calibration process (3D then 2D targets) enhances dependability and accuracy.
• Effectiveness was demonstrated by calibrating two distinct anamorphic lenses.

Conclusions:

• The novel approach provides a robust solution for anamorphic lens calibration.
• The combined use of 3D and 2D targets overcomes field-of-view and stability issues.
• This method offers improved accuracy for applications utilizing anamorphic optics.