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Optical Engineering

Dot-matrix hologram with hidden image
Author(s): S. L. Yeh; Shyh Tsong Lin
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Paper Abstract

To enhance the security of a dot-matrix hologram (DMH), a method to hide an image inside the DMH is proposed. The hidden image, which does not depress the visibility and the dynamic-effect feature of the DMH, is invisible but can be reconstructed by illuminating the DMH with a specified laser beam. The reconstructed hidden image is invariable to the lateral shift between the laser beam and DMH. Two experiments are carried out to illustrate the applicability of the proposed method.

Paper Details

Date Published: 1 February 2002
PDF: 5 pages
Opt. Eng. 41(2) doi: 10.1117/1.1428297
Published in: Optical Engineering Volume 41, Issue 2
Show Author Affiliations
S. L. Yeh, Lunghwa Univ. of Science and Technology (Taiwan)
Shyh Tsong Lin, National Taipei Univ. of Technology (Taiwan)


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