Multiple polarization encoding for gray image encryption based on liquid crystal exclusive or logic

Han Yen Tu, Mao Ling Chen, Chau Jern Cheng

Research output: Contribution to journalArticle

6 Citations (Scopus)


This work proposes and demonstrates the feasibility of gray image encryption using multiple polarization encoding, in which the cascaded twisted nematic liquid crystal devices sandwiched between a crossed polarizer pair are used to implement exclusive OR (XOR) logical encryption and decryption. The polarization encoding scheme provides a multichannel XOR logic operation to secure bit-plane images derived from a gray image, according to the adiabatic following properties of twisted nematic liquid crystal devices. Experimental data reveal that the multiple polarization encoding schemes for gray image encryption and decryption are performed with acceptable image quality by selecting appropriate polarization orientation and modulation conditions. Both analytic and experimental results are presented and discussed.

Original languageEnglish
Pages (from-to)308-313
Number of pages6
JournalOptical Review
Issue number5
Publication statusPublished - 2006 Sep 1



  • Exclusive OR logic
  • Optical encryption
  • Polarization-encoding

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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