1 January 1999 Transformed phase mask and photoanisotropic material in optical correlators applied for security verification
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Optical Engineering, 38(1), (1999). doi:10.1117/1.602058
Abstract
A security verification method using a transform phase mask as an optical mark bonded to a document or some other object is proposed. This mask consists of separated and shifted fragments of a reference phase mask. Both masks are entered into an optical correlator as input and reference images. We consider the model of autocorrelation peaks produced and of feature vectors formed in a classical joint transform correlator. We propose to use a reversible photoanisotropic material in the frequency domain of a joint transform correlator. We show that such a material can be used in optical security devices. The joint transform correlator experimental setup containing the photoanisotropic material is designed and the optimum exposures of material to produce autocorrelation peaks are found.
Leonid I. Muravsky, Taras I. Voronyak, Volodymyr M. Fitio, Mykhajlo V. Shovgenyuk, "Transformed phase mask and photoanisotropic material in optical correlators applied for security verification," Optical Engineering 38(1), (1 January 1999). https://doi.org/10.1117/1.602058
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