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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Abstract
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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