Endoscope

Background

Key Terms

Optical Aberration: errors in an image that are caused mostly by imperfect manufacturing and approximations made based on our knowledge and understanding of light. Some of the more common types are Spherical aberration, Coma, Astigmatism, Curvature of Field, Chromatic aberration, and in our case Distortion

Distortion: a commonly used term in modern day photography that refers to any deviation from rectilinear projection. Though distortion comes in a wide range of patterns and irregular forms, the most common types we see are "Barrel Distortion" and "Pincushion distortion" as depicted below.

Pincushion: image magnification increases with the distance from the optical axis
Barrel: image magnification decreases with distance from the optical axis.

Geometric Calibration: determination of the geometric relation of the imaging process of a camera

Method

Hardware

Endoscope system

Endoscope capturing images of the displayed calibration target

Captured image displayed onscreen