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Practical zoom camera calibration method for close-range photogrammetry.

Zhen Zhang, Jiehu Kang, Luyuan Feng

|January 13, 2023

Summary

This summary is machine-generated.

A new practical calibration method enhances zoom camera use in close-range photogrammetry. This technique simplifies zoom-focus modeling for real-time adjustments, improving accuracy and adaptability.

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Area of Science:

Photogrammetry
Computer Vision
Optical Engineering

Background:

Zoom lenses offer flexibility but face calibration challenges in close-range photogrammetry.
Precise calibration is crucial for accurate 3D measurements using cameras.

Purpose of the Study:

To propose a practical calibration method for zoom cameras in close-range photogrammetry.
To enable real-time zoom and focus adjustments for varying measurement depths.

Main Methods:

Developed a zoom-focus model using dimension reduction of setting variables.
Implemented real-time updates of zoom and focus settings.
Utilized nonlinear joint optimization to solve model coefficients.

Main Results:

The proposed method effectively calibrates zoom cameras for photogrammetric applications.
Experimental results validate the method's efficacy in close-range scenarios.

Conclusions:

The developed calibration technique overcomes previous limitations of zoom cameras in photogrammetry.
This method enhances the adaptability and precision of zoom cameras for 3D reconstruction.