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Medical-grade Sterilizable Target for Fluid-immersed Fetoscope Optical Distortion Calibration

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Published on: February 23, 2017

Method for calibrating the fisheye distortion center.

Fuyu Huang¹, Yongzhong Wang, Xueju Shen

¹Department of Optical and Electronic Engineering, Shijiazhuang Mechanical Engineering College, Heping West Road 97, Shijiazhuang, Hebei 050003, China. hfyoptics@163.com

|December 5, 2012

Summary

A new method accurately calibrates fisheye distortion center using ellipse and Gaussian surface fitting. This approach enhances precision and stability for equidistant fisheye cameras without needing specific distortion models.

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Area of Science:

Computer Vision
Optical Engineering

Background:

Fisheye lenses offer wide fields of view but introduce significant distortion.
Accurate calibration of the fisheye distortion center is crucial for many applications.
Existing methods may rely on specific distortion models or additional parameters, increasing complexity.

Purpose of the Study:

To propose a simple and precise method for calibrating the fisheye distortion center.
To develop a calibration technique that is independent of specific distortion models and parameters.
To enhance the stability and accuracy of fisheye camera calibration.

Main Methods:

A novel method synthesizing ellipse fitting and Gaussian surface fitting algorithms.
Detailed analysis of the imaging projection of equidistant fisheye lenses.
Utilizing only the image information from a calibration board.

Main Results:

Ellipse fitting error below 0.06 pixels.
Relative error of Gaussian surface fitting below 1.5%.
Demonstrated higher calibration precision and stability compared to existing inference methods.

Conclusions:

The proposed method offers a robust and accurate solution for fisheye distortion center calibration.
Its independence from specific models makes it suitable for any equidistant fisheye camera.
The method simplifies calibration complexity by relying solely on image data.