Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

High-precision camera distortion measurements with a “calibration harp”

Not Accessible

Your library or personal account may give you access

Abstract

This paper addresses the high-precision measurement of the distortion of a digital camera from photographs. Traditionally, this distortion is measured from photographs of a flat pattern that contains aligned elements. Nevertheless, it is nearly impossible to fabricate a very flat pattern and to validate its flatness. This fact limits the attainable measurable precisions. In contrast, it is much easier to obtain physically very precise straight lines by tightly stretching good quality strings on a frame. Taking literally “plumb-line methods,” we built a “calibration harp” instead of the classic flat patterns to obtain a high-precision measurement tool, demonstrably reaching 2/100 pixel precisions. The harp is complemented with the algorithms computing automatically from harp photographs two different and complementary lens distortion measurements. The precision of the method is evaluated on images corrected by state-of-the-art distortion correction algorithms, and by popular software. Three applications are shown: first an objective and reliable measurement of the result of any distortion correction. Second, the harp permits us to control state-of-the art global camera calibration algorithms: it permits us to select the right distortion model, thus avoiding internal compensation errors inherent to these methods. Third, the method replaces manual procedures in other distortion correction methods, makes them fully automatic, and increases their reliability and precision.

© 2012 Optical Society of America

Full Article  |  PDF Article
More Like This
High-precision method of binocular camera calibration with a distortion model

Weimin Li, Siyu Shan, and Hui Liu
Appl. Opt. 56(8) 2368-2377 (2017)

Calibration of line-scan cameras for precision measurement

Bo Sun, Jigui Zhu, Linghui Yang, Shourui Yang, and Zhiyuan Niu
Appl. Opt. 55(25) 6836-6843 (2016)

Modelling and calibration of depth-dependent distortion for large depth visual measurement cameras

Peng Sun, Naiguang Lu, and Mingli Dong
Opt. Express 25(9) 9834-9847 (2017)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (12)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (20)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved