Securing information by use of digital holography

Javidi, Bahram; Nomura, Takanori

doi:10.1364/ol.25.000028

Cited by 460 publications

(177 citation statements)

References 10 publications

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“…With the approaches described in Refs. [7] and [11], two phase masks were inserted in the object wave path for DRPE; however, with our system, they are applied to the object and reference waves. The Fresnel-type DRPE uses three cipher keys: the phase distribution on the Fresnel domain, the distance of Fresnel diffraction, and the wavelength of laser; all of which that must be provided correctly to restore the plaintext image from the encrypted image.…”

Section: Encrypted Sensing Based On Drpementioning

confidence: 99%

“…DRPE is an optical symmetric-key encryption technique in which an optical image is encrypted by multiplying two random phase masks in the spatial and Fourier or Fresnel planes. To obtain an optically-encrypted image, digital holography (DH) [7]- [10] is commonly employed. DH makes it possible to not only capture an optical wavefront as holographic data, but also to reconstruct various styles of optical wavefront computationally from the holographic data.…”

Section: Introductionmentioning

confidence: 99%

“…DH makes it possible to not only capture an optical wavefront as holographic data, but also to reconstruct various styles of optical wavefront computationally from the holographic data. DRPE has been implemented using DH [7] [11], whereby the random phase masks are typically inserted into the object beam path. Suchan optical system requires precise alignment; however, it is challenging to reconstruct the object image with high quality from the DH.…”

Section: Introductionmentioning

confidence: 99%

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Encrypted Sensing Based on Digital Holography for Fingerprint Images

Takeda¹,

Nakano²,

Suzuki³

et al. 2015

OPJ

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We propose a novel biometric sensing technique for personal authentication in which fingerprint images are captured using an optical encryption method. This method can reduce the risk of data theft or leakage of personal information captured by biometric sensing. This method, termed encrypted sensing, is implemented using digital holography with double random phase encoding. We demonstrate experimentally that a fingerprint image can be captured as an optically encrypted image and can be restored correctly only when the correct cipher key is used. Moreover, we investigate experimentally the verification accuracy of the decrypted images.

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Section: Encrypted Sensing Based On Drpementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Encrypted Sensing Based on Digital Holography for Fingerprint Images

Takeda¹,

Nakano²,

Suzuki³

et al. 2015

OPJ

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show abstract

“…Many techniques for the optical encryption of image data have been proposed and implemented in recent years [51][52][53][54][55][56][57][58][59][60][61][62]. Most perform encryption with a random phase mask positioned in the input, Fresnel, or Fraunhofer domain, or a combination of domains.…”

Section: Optical Image Encryptionmentioning

confidence: 99%

“…These invariably produce a complex-valued encrypted image. Digital holography [63][64][65][66][67][68][69][70] can be used to measure complex-valued wavefronts, and it has been applied to the encryption of 2D conventional (real-valued) images [57][58][59]. Of these, the techniques based on phase-shift interferometry [65,67,70] (PSI) make good use of detector resources in that they capture on-axis encrypted digital holograms [58,59].…”

Section: Optical Image Encryptionmentioning

confidence: 99%

Phase in Optical Image Processing

Naughton¹,

Rastogi²,

Hack³

2010

AIP Conference Proceedings

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Abstract. The use of phase has a long standing history in optical image processing, with early milestones being in the field of pattern recognition, such as VanderLugt's practical construction technique for matched filters, and (implicitly) Goodman's joint Fourier transform correlator. In recent years, the flexibility afforded by phase-only spatial light modulators and digital holography, for example, has enabled many processing techniques based on the explicit encoding and decoding of phase. One application area concerns efficient numerical computations. Pushing phase measurement to its physical limits, designs employing the physical properties of phase have ranged from the sensible to the wonderful, in some cases making computationally easy problems easier to solve and in other cases addressing mathematics' most challenging computationally hard problems. Another application area is optical image encryption, in which, typically, a phase mask modulates the fractional Fourier transformed coefficients of a perturbed input image, and the phase of the inverse transform is then sensed as the encrypted image. The inherent linearity that makes the system so elegant mitigates against its use as an effective encryption technique, but we show how a combination of optical and digital techniques can restore confidence in that security. We conclude with the concept of digital hologram image processing, and applications of same that are uniquely suited to optical implementation, where the processing, recognition, or encryption step operates on full field information, such as that emanating from a coherently illuminated real-world three-dimensional object.

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Revisiting the Design Strategies for Metasurfaces: Fundamental Physics, Optimization, and Beyond

Mun

Park

et al. 2023

Advanced Materials

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Over the last two decades, the capabilities of metasurfaces in light modulation with subwavelength thickness have been proven, and metasurfaces are expected to miniaturize conventional optical components and add various functionalities. Herein, various metasurface design strategies are reviewed thoroughly. First, the scalar diffraction theory is revisited to provide the basic principle of light propagation. Then, widely used design methods based on the unit‐cell approach are discussed. The methods include a set of simplified steps, including the phase‐map retrieval and meta‐atom unit‐cell design. Then, recently emerging metasurfaces that may not be accurately designed using unit‐cell approach are introduced. Unconventional metasurfaces are examined where the conventional design methods fail and finally potential design methods for such metasurfaces are discussed.

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Securing information by use of digital holography

Cited by 460 publications

References 10 publications

Encrypted Sensing Based on Digital Holography for Fingerprint Images

Encrypted Sensing Based on Digital Holography for Fingerprint Images

Phase in Optical Image Processing

Revisiting the Design Strategies for Metasurfaces: Fundamental Physics, Optimization, and Beyond

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