An auto-focusing method in a microscopic testbed for optical discs | Zendy

Xiao Tang | Zendy; P. L'Hostis | Zendy; Xiao Yan | Zendy

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An auto-focusing method in a microscopic testbed for optical discs

Author(s) -

Xiao Tang,

P. L'Hostis,

Xiao Yan

Publication year - 2000

Publication title -

journal of research of the national institute of standards and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.202

H-Index - 59

eISSN - 2165-7254

pISSN - 1044-677X

DOI - 10.6028/jres.105.046

Subject(s) - testbed , autofocus , computer science , pixel , focus (optics) , software , optics , charge coupled device , microscope , digital camera , computer vision , standard deviation , optical microscope , artificial intelligence , physics , scanning electron microscope , computer network , statistics , mathematics , programming language

An auto-focusing method in a digital image system is demonstrated that uses a standard deviation of pixel gray levels as a feedback signal. In this system, an optical microscope and a charge coupled device (CCD) camera are used to create clear pit images of optical discs. A dynamic focusing scheme is designed in the system-control software, which is able to eliminate environmental disturbances and other noises so that a fast and stable focus can be achieved. The method shows an excellent focusing accuracy. The performance and possible applications of this method are discussed. The test results for optical discs are given in this paper.

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