NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PUBLICATIONS

An Auto-Focusing Method in Microscopic Testbed for Optical Discs

Published

Author(s)

Xiao Tang, P L'Hostis, Y Xiao

Abstract

An auto-focusing method is described and practically applied to an optical disc test-bed. In this application, an optical microscope was used to create clear pit images of optical discs. A CCD camera generated the graphic signals for the images. A standard deviation value of the gray levels for all pixels in the image is used as a feedback for auto-focusing control. The performance and possible applications of this method are discussed and test results for optical discs are given in this paper.
Citation
Journal of Research (NIST JRES) -
Volume
105 No. 4
NIST Pub Series
Journal of Research (NIST JRES)
Pub Type
NIST Pubs

Keywords

auto-focus, disc testbed, optical discs, standard deviation

Citation

Tang, X. , L'Hostis, P. and Xiao, Y. (2000), An Auto-Focusing Method in Microscopic Testbed for Optical Discs, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD (Accessed October 15, 2025)

Issues

If you have any questions about this publication or are having problems accessing it, please contact [email protected].

Created July 1, 2000, Updated February 17, 2017
Was this page helpful?