A simplified and versatile calibration method for multi-camera optical systems in 3D particle imaging

Area of Science:

• Optical Engineering
• Computer Vision
• Metrology

Background:

• Accurate 3D reconstruction relies on precise camera calibration.
• Existing methods often require complex optical models and are less versatile.
• There is a need for robust and user-friendly calibration techniques.

Purpose of the Study:

• To present a novel stereoscopic multi-camera calibration method.
• To demonstrate a technique that does not require an optical model.
• To offer a simpler, more accurate, and versatile calibration solution.

Main Methods:

• Calibration based on measuring light propagation within the volume.
• Utilizes simple plane-by-plane transformations.
• Directly links pixel coordinates to light rays without full optical path modeling.

Main Results:

• Achieves higher accuracy compared to the pinhole camera model.
• Demonstrates simplicity of implementation in complex optical setups.
• Successfully handles index-of-refraction gradients and intricate optical arrangements.

Conclusions:

• The proposed method offers a significant improvement in accuracy and versatility.
• Its ease of implementation makes it suitable for various sophisticated imaging systems.
• This turn-key algorithm, drawing from fluid mechanics, is readily implementable with open-source routines.