This work presents a novel method for optical decrypted key production by screen printing technology. The key is
mainly used to decrypt encoded information hidden inside documents containing Moire patterns and integral
photographic 3D auto-stereoscopic images as a second-line security file. The proposed method can also be applied as an
anti-counterfeiting measure in artistic screening. Decryption is performed by matching the correct angle between the
decoding key and the document with a text or a simple geometric pattern. This study presents the theoretical analysis and
experimental results of the decoded key production by the best parameter combination of Moire pattern size and screen
printing elements. Experimental results reveal that the proposed method can be applied in anti-counterfeit document
design for the fast and low-cost production of decryption key.
In this work we present a single exposure method for recording multiple holograms in reflection holography. In this
novel method, the input pattern is a segmented image composed of alternating slices of several original images and
modulated by a lenticular lens array sheet. A set of object beams can be produced simultaneously, which are angularly
separated on the recording plane and overlap one reference beam at the same time. Therefore, only one exposure is
needed for holographic recording multiple holograms. Experimental results show that a lenticular lens array sheet placed
as a modulator in the path of the object beam provides a simple yet effective ingredient of creating multiple images for
single-exposure holography. The proposed method is especially useful for one-step write/read multiple holograms and
for stereoscopic display applications.