Camera calibration for anamorphic lenses with three-dimensional targets.

Area of Science:

• Optics and Photonics
• Computer Vision
• Metrology

Background:

• Anamorphic lenses possess distinct optical powers in tangential and sagittal planes, necessitating specialized calibration methods.
• Existing pinhole models are insufficient for accurately characterizing anamorphic lens properties.

Purpose of the Study:

• To introduce and validate a novel anamorphic imaging model for precise lens calibration.
• To determine the intrinsic parameters of anamorphic lenses, including anamorphic distance and angle.

Main Methods:

• Development of an anamorphic imaging model incorporating two additional intrinsic parameters: anamorphic distance and anamorphic angle.
• Formulation of equations for estimating the initial value of the anamorphic distance.
• Conducting two calibration experiments comparing the proposed model against the conventional pinhole model.

Main Results:

• The anamorphic imaging model demonstrated significantly improved calibration accuracy over the pinhole model.
• Calibrated values for anamorphic distance and angle exhibited high stability across various target positions.
• The proposed model proved effective and valid for anamorphic lens calibration.

Conclusions:

• The novel anamorphic imaging model is essential for accurate and stable calibration of anamorphic lenses.
• This model provides a more robust solution for applications requiring precise anamorphic lens characterization.
• The findings validate the effectiveness of the anamorphic imaging model in computer vision and optical metrology.