Polarization encoding and multiplexing of two-dimensional signals: application to image encryption

Gopinathan, Unnikrishnan; Naughton, Thomas J.; Sheridan, John T.

doi:10.1364/ao.45.005693

Cited by 55 publications

(24 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To determine the Jones matrix of the SLM a Mach-Zehnder interferometer is used [23], [24]. The SLM is placed in one arm of a Mach-Zehnder interferometer.…”

Section: Methodsmentioning

confidence: 99%

“…The SLM is placed in one arm of a Mach-Zehnder interferometer. A split pattern with regions consisting of two gray levels-the gray level at which the Jones Matrix has to be estimated and a reference zero gray level -is displayed on the SLM [23], [24]. The parameters , and are estimated by measuring the shift in fringes formed due to interference of the light passing through the two regions displaying different gray levels (which are a function of the applied voltage ' ').…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A Projection System for Real World Three-Dimensional Objects Using Spatial Light Modulators

Gopinathan

Monaghan

Hennelly

et al. 2008

J. Display Technol.

Self Cite

View full text Add to dashboard Cite

Abstract-We discuss a projection system for real world threedimensional objects using spatial light modulators (SLM). An algorithm to encode the digital holograms of real world objects on to an SLM is presented. We present results from experiments to project holograms of real world holograms using a nematic liquid crystal SLM. We discuss the case when the pixel sizes of the charge-coupled device (CCD) and SLM used for recording the hologram and projection are different.

show abstract

“…To determine the Jones matrix of the SLM a Mach-Zehnder interferometer is used [23], [24]. The SLM is placed in one arm of a Mach-Zehnder interferometer.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

A Projection System for Real World Three-Dimensional Objects Using Spatial Light Modulators

Gopinathan

Monaghan

Hennelly

et al. 2008

J. Display Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…On the other hand, they can increase compression and encryption rates. The potential developed here could be used in other interesting research directions, such as (i) encryption methods based on polarization [152,153] that allow encryption of images not only rapidly, but also at the source, (ii) multiplexing methods using the spatial coherence principle, permitting mathematical operations to be performed at the source without any preprocessing [154,155], and (iii) the Fresnel field [156]. …”

Section: Summary and Perspectivesmentioning

confidence: 99%

Optical image compression and encryption methods

Alfalou¹,

Brosseau²

2009

Adv. Opt. Photon.

467

198

View full text Add to dashboard Cite

Over the years extensive studies have been carried out to apply coherent optics methods in real-time communications and image transmission. This is especially true when a large amount of information needs to be processed, e.g., in high-resolution imaging. The recent progress in data-processing networks and communication systems has considerably increased the capacity of information exchange. However, the transmitted data can be intercepted by nonauthorized people. This explains why considerable effort is being devoted at the current time to data encryption and secure transmission. In addition, only a small part of the overall information is really useful for many applications. Consequently, applications can tolerate information compression that requires important processing when the transmission bit rate is taken into account. To enable efficient and secure information exchange, it is often necessary to reduce the amount of transmitted information. In this context, much work has been undertaken using the principle of coherent optics filtering for selecting relevant information and encrypting it. Compression and encryption operations are often carried out separately, although they are strongly related and can influence each other. Optical processing methodologies, based on filtering, are described that are applicable to transmission and/or data storage. Finally, the advantages and limitations of a set of optical compression and encryption methods are discussed.

show abstract

“…In particular, much effort has been devoted to searching for new types of encryption methods which can be implemented in an optical setup [2][3][4][5]. These efforts are aimed at combining the excellent control possible with spatial light modulators, with the miniaturization, parallelism, and integrability of optical devices.…”

mentioning

confidence: 99%

“…Since the early work of Dolfuss and co-workers [6] dealing with polarization imaging, several polarization encryption methods were considered (see [3][4][8][9] and references therein).…”

mentioning

confidence: 99%