Back to Search Start Over

Automatic distortion measuring system with reticle positioning for enhanced accuracy

Automatic distortion measuring system with reticle positioning for enhanced accuracy

Authors :
Chieh-Jen Lee
Mau-Shiun Yeh
Chern-Sheng Lin
Yun-Long Lay
Su-Chi Chang
Source :
Measurement. 41:960-969
Publication Year :
2008
Publisher :
Elsevier BV, 2008.

Abstract

In this paper an automatic measuring system for lens distortion is presented. The system consists of a screen showing reticle-type target moving inward automatically and a camera to capture the image for analysis. The computer plots the center coordinate groups of the cross and obtains the distortion result of the testing camera lens. A new computation method of reticle positioning is used in this research with linear regressions. In the compensation process, we cancel the large deviation points, then transforms the coordinates of the original sampling points from a vertical sampling point group to a horizontal one with a 90° rotation around the original point. The experimental results, including system calibration, alignment calculation, mark locations, and statistical functions of inspection are presented and evaluated. The speed and accuracy of this imaging system are supported by the available experimental observations.

Details

ISSN :
02632241
Volume :
41
Database :
OpenAIRE
Journal :
Measurement
Accession number :
edsair.doi...........9388d89c95fc4fc8a0169126c5574fa9
Full Text :
https://doi.org/10.1016/j.measurement.2008.01.011