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Microprocessor-controlled automatic focusing of a lens

Kalpagam, K and Naidu, PS (1987) Microprocessor-controlled automatic focusing of a lens. In: Journal of Microcomputer Applications, 10 (2). pp. 101-112.

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Maximum intensity contrast has been used as a measure of lens defocus. A photodiode array under the control of 8085 microprocessor is used to measure the maximum intensity contrast and to position the lens for best focus. The lens is moved by a stepper motor under processor control at a speed of 350 to 500 steps/s. At this speed, focusing time was found to be between 5 and 8 s. Under coherent illuminating conditions, an accuracy of ± 50 μm has been achieved.

Item Type: Journal Article
Publication: Journal of Microcomputer Applications
Publisher: Elsevier Science
Additional Information: Copy right of this article belongs to Elsevier Science.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 15 Jan 2010 05:05
Last Modified: 15 Jan 2010 05:05
URI: http://eprints.iisc.ac.in/id/eprint/21082

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