This work proposes and demonstrates the feasibility of gray image encryption using multiple polarizationencoding, in which the cascaded twisted nematic liquid crystal devices sandwiched between a crossed polarizer pa...
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This work proposes and demonstrates the feasibility of gray image encryption using multiple polarizationencoding, 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 polarizationencoding 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 polarizationencoding 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. (c) 2006 The Optical Society of Japan
This work describes a polarization-encoding scheme with cascaded liquid crystal spatial light modulators for two-dimensional exclusive OR logic encryption. The transfer characteristic of the encryption system is analy...
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This work describes a polarization-encoding scheme with cascaded liquid crystal spatial light modulators for two-dimensional exclusive OR logic encryption. The transfer characteristic of the encryption system is analysed to determine suitable polarization modulation for optical realization. Performance is compared across systems that use various displays, including twisted nematic, supertwisted nematic and homogeneously parallel aligned nematic liquid crystal devices. Experiments show that binary image encryption/decryption is accomplished with fair image quality by choosing the orientation of the polarization and modulation conditions. Both simulated and experimental results are presented and discussed.
Important aspects of automatic pattern recognition systems are their ability to efficiently discriminate and detect proper targets with low false alarms. In this paper we extend the applications of passive imaging pol...
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ISBN:
(纸本)0819462969
Important aspects of automatic pattern recognition systems are their ability to efficiently discriminate and detect proper targets with low false alarms. In this paper we extend the applications of passive imaging polarimetry to effectively discriminate and detect different color targets of identical shapes using color-blind imaging sensor. For this case of study we demonstrate that traditional color-blind polarization-insensitive imaging sensors that rely only on the spatial distribution of targets suffer from high false detection rates, especially in scenarios where multiple identical shape targets are present. On the other hand we show that color-blind polarization-sensitive imaging sensors can successfully and efficiently discriminate and detect true targets based on their color only. We highlight the main advantages of using our proposed polarization-encoded imaging sensor.
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