Holography

Dot-matrix hologram with hidden image

[+] Author Affiliations
Sheng-Lih Yeh

Lunghwa University of Science and Technology, Department of Mechanical Engineering, No. 300, Wanshou Rd., Sec 1, Kueishan, Taoyuan County, Taiwan

Shyh-Tsong Lin

National Taipei University of Technology, Department of Mechanical Engineering, 1, Sec. 3, Chung Hsiao East Road, Taipei?10643, Taiwan

Opt. Eng. 41(2), 314-318 (Feb 01, 2002). doi:10.1117/1.1428297
History: Received Jan. 5, 2001; Revised May 15, 2001; Accepted Aug. 13, 2001
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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. © 2002 Society of Photo-Optical Instrumentation Engineers.

© 2002 Society of Photo-Optical Instrumentation Engineers

Citation

Sheng-Lih Yeh and Shyh-Tsong Lin
"Dot-matrix hologram with hidden image", Opt. Eng. 41(2), 314-318 (Feb 01, 2002). ; http://dx.doi.org/10.1117/1.1428297


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