1 September 2008 Hybrid certificate validation technique based on Fresnel encoding
Author Affiliations +
Optical Engineering, 47(9), 098201 (2008). doi:10.1117/1.2981561
An optic-electronic hybrid certificate validation technique based on Fresnel encoding is proposed. A confirming experiment has been carried out. This technique consists of two processes: encoding and decoding. During the encoding process, an original image is encoded by a computer into an encoded image, which is subsequently printed on a certificate. During the decoding process, the encoded image is extracted from the certificate and decoded optically. The experimental result proves the validity and reveals some advantages of our method. Compared with some previous works, more useful original information can be encoded in our method. The security level of our method is also enhanced by importing the Fresnel diffraction range z as another key. This paper also explores practical application of this technique.
Kenan Wu, Jiasheng Hu, Xu Wu, "Hybrid certificate validation technique based on Fresnel encoding," Optical Engineering 47(9), 098201 (1 September 2008). http://dx.doi.org/10.1117/1.2981561

Computer programming

Image processing

Image encryption


Image restoration

Spatial light modulators

Near field diffraction

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