Special Section on Quality Control by Artificial Vision

Efficient focus assessment for a computer vision-based Vickers hardness measurement system

[+] Author Affiliations
Andreas Maier

University of Salzburg, Department of Computer Sciences, Salzburg, Austria A-5020

Georg Niederbrucker

University of Salzburg, Department of Computer Sciences, Salzburg, Austria A-5020

Sebastian Stenger

University of Salzburg, Department of Computer Sciences, Salzburg, Austria A-5020

Andreas Uhl

University of Salzburg, Department of Computer Sciences, Salzburg, Austria A-5020

J. Electron. Imaging. 21(2), 021114 (May 15, 2012). doi:10.1117/1.JEI.21.2.021114
History: Received September 15, 2011; Revised February 22, 2012; Accepted March 2, 2012
Text Size: A A A

Abstract.  A large variety of computationally lightweight functions used for assessing image sharpness in the spatial domain is evaluated for application in a passive autofocus system in the context of microindentation-based Vickers hardness testing. Alternatively, the file size of compressed JPEG images is proposed to determine image sharpness. The functions are evaluated on a significant dataset of microindentation images with respect to their properties required for focus search and sharpness assessment, their robustness to downsampling the image data, and their computational demand. Experiments suggest that of all spatial domain techniques considered, the simple Brenner autofocus function is the best compromise between accuracy and computational effort, while JPEG file size is a versatile solution when the application context allows.

© 2012 SPIE and IS&T

Citation

Andreas Maier ; Georg Niederbrucker ; Sebastian Stenger and Andreas Uhl
"Efficient focus assessment for a computer vision-based Vickers hardness measurement system", J. Electron. Imaging. 21(2), 021114 (May 15, 2012). ; http://dx.doi.org/10.1117/1.JEI.21.2.021114


Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging & repositioning the boxes below.

Related Book Chapters

PubMed Articles
Shape Analysis with Hyperbolic Wasserstein Distance. Proc IEEE Comput Soc Conf Comput Vis Pattern Recognit 2016;2016():5051-5061.
Advertisement
  • Don't have an account?
  • Subscribe to the SPIE Digital Library
  • Create a FREE account to sign up for Digital Library content alerts and gain access to institutional subscriptions remotely.
Access This Article
Sign in or Create a personal account to Buy this article ($20 for members, $25 for non-members).
Access This Proceeding
Sign in or Create a personal account to Buy this article ($15 for members, $18 for non-members).
Access This Chapter

Access to SPIE eBooks is limited to subscribing institutions and is not available as part of a personal subscription. Print or electronic versions of individual SPIE books may be purchased via SPIE.org.