Optical image encryption based on polarization encoding by liquid crystal spatial light modulators

Tu, Han Yen; Cheng, Chau Jern; Chen, Mao Ling

doi:10.1088/1464-4258/6/6/005

Cited by 31 publications

(17 citation statements)

References 18 publications

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“…In this framework, they provide the feasibility to obtain structured illumination [10,11], or they stand as pattern generators to achieve real-time laser beam shaping [12,13]. Last but not least, LCDs are also used to implement optical tweezers [14,15], optical encryption [16] or digital lenses with improved performance [17,18].…”

Section: Introductionmentioning

confidence: 99%

Self-addressed diffractive lens schemes for the characterization of LCoS displays

Zhang

Lizana

Iemmi

et al. 2018

Emerging Liquid Crystal Technologies XIII

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We proposed a self-calibration method to calibrate both the phase-voltage look-up table and the screen phase distribution of Liquid Crystal on Silicon (LCoS) displays by implementing different lens configurations on the studied device within a same optical scheme. On the one hand, the phase-voltage relation is determined from interferometric measurements, which are obtained by addressing split-lens phase distributions on the LCoS display. On the other hand, the surface profile is retrieved by self-addressing a diffractive micro-lens array to the LCoS display, in a way that we configure a Shack-Hartmann wavefront sensor that self-determines the screen spatial variations. Moreover, both the phase-voltage response and the surface phase inhomogeneity of the LCoS are measured within the same experimental set-up, without the necessity of further adjustments. Experimental results prove the usefulness of the above-mentioned technique for LCoS displays characterization.

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Section: Introductionmentioning

confidence: 99%

Self-addressed diffractive lens schemes for the characterization of LCoS displays

Zhang

Lizana

Iemmi

et al. 2018

Emerging Liquid Crystal Technologies XIII

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“…Optical encryption using polarization of light has attracted much attention because polarization encryption provides additional flexibility in the encryption key design [27][28][29][30][31][32][33][34]. Unnikrishnan et al [27] demonstrated an optical encryption scheme based on polarization of light for binary images.…”

Section: Introductionmentioning

confidence: 99%

“…Polarization encoding has also been proposed to secure holographic memory [30,31]. Tu et al [32] demonstrated a polarization-encoding scheme with cascaded liquid crystal SLMs. Biener et al [33] presented an approach for geometrical phase encryption using spatial polarization state manipulation.…”

Section: Introductionmentioning

confidence: 99%

Image encryption using polarized light encoding and amplitude and phase truncation in the Fresnel domain

Rajput

Nishchal

2013

Appl. Opt.

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In this paper, an image encryption scheme based on polarized light encoding and a phase-truncation approach in the Fresnel transform domain is proposed. The phase-truncated data obtained by an asymmetric cryptosystem is encrypted and decrypted by using the concept of the Stokes-Mueller formalism. Image encryption based on polarization of light using Stokes-Mueller formalism has the main advantage over Jones vector formalism that it manipulates only intensity information, which is measurable. Thus any intensity information can be encrypted and decrypted using this scheme. The proposed method offers several advantages: (1) a lens-free setup, (2) flexibility in the encryption key design, (3) use of asymmetric keys, and (4) immunity against special attack. We present numerical simulation results for gray-scale and color images in support of the proposed security scheme. The performance measurement parameters relative error and correlation coefficient have been calculated to check the effectiveness of the scheme.

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“…The initial research in LC technology was driven by the electronic consumer industry aiming to develop various projection displays, computer screens, liquid crystal television [1][2][3][4][5] etc. However, the increasing versatility, advancement in fabrication technology and low cost of LC spatial light modulators (LC-SLM) have led to its use in diverse areas of scientific research ranging from optical correlation, beam steering, matched filtering, polarization control to optical data processing, tweezers, laser projection, dynamic holography, wave-front sensing and correction in adaptive optics system [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear response studies and corrections for a liquid crystal spatial light modulator

Banyal

Prasad

2010

Pramana - J Phys

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The nonlinear response of light transmission characteristics of a liquid crystal (LC) spatial light modulator (SLM) is studied. The results show that the device exhibits a wide range of variations with different control parameters and input settings. Experiments were performed to obtain intensity modulation that is best described by either power-law or sigmoidal functions. Based on the inverse transformation, an appropriate pre-processing scheme for electrically addressed input gray-scale images, particularly important in several optical processing and imaging applications, is suggested. Further, the necessity to compensate the SLM image nonlinearities in a volume holographic data storage and retrieval system is demonstrated.

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Optical image encryption based on polarization encoding by liquid crystal spatial light modulators

Cited by 31 publications

References 18 publications

Self-addressed diffractive lens schemes for the characterization of LCoS displays

Self-addressed diffractive lens schemes for the characterization of LCoS displays

Image encryption using polarized light encoding and amplitude and phase truncation in the Fresnel domain

Nonlinear response studies and corrections for a liquid crystal spatial light modulator

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