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

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Published on: February 23, 2017

High-precision camera distortion measurements with a "calibration harp".

Zhongwei Tang¹, Rafael Grompone von Gioi, Pascal Monasse

¹Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA. tang@cmla.ens‑cachan.fr

Journal of the Optical Society of America. A, Optics, Image Science, and Vision

|December 4, 2012

Summary

This study introduces a novel "calibration harp" for precise digital camera distortion measurement, overcoming limitations of traditional flat patterns. This method achieves sub-pixel accuracy, enhancing camera calibration and distortion correction reliability.

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Area of Science:

Optics and Photonics
Computer Vision
Metrology

Background:

Traditional digital camera distortion measurement relies on flat patterns, which are difficult to fabricate and validate for flatness.
This limitation restricts the achievable precision in measuring lens distortion.
Existing methods may lead to internal compensation errors in global camera calibration algorithms.

Purpose of the Study:

To develop a high-precision measurement tool for digital camera distortion.
To introduce a novel method that overcomes the limitations of traditional flat patterns.
To enable objective and reliable evaluation of distortion correction algorithms and camera calibration.

Main Methods:

Development of a "calibration harp" using precisely stretched straight lines (strings) as an alternative to flat patterns.
Implementation of algorithms to automatically compute two complementary lens distortion measurements from harp photographs.
Evaluation of the method's precision using images corrected by state-of-the-art algorithms and popular software.

Main Results:

Demonstrated sub-pixel precision (2/100 pixels) in distortion measurement using the calibration harp.
The harp provides an objective and reliable way to assess the performance of distortion correction techniques.
The method facilitates the selection of appropriate distortion models for global camera calibration, reducing inherent errors.

Conclusions:

The calibration harp offers a significant advancement in high-precision camera distortion measurement.
This technique enhances the automation, reliability, and precision of various distortion correction and camera calibration methods.
The developed method provides a robust tool for scientific and industrial applications requiring accurate camera metrology.