Kehar Singh

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Fractional Fourier transform based image multiplexing and encryption technique for four-color images using input images as keys

Chandra Shakher, Madhusudan Joshi, Kehar Singh, 2010 .

Content-addressable Holographic Digital Data Storage Based on Hybrid Ternary Modulation with a Twisted-Nematic Liquid-Crystal Spatial Light Modulator

Kehar Singh, Joby Joseph, Renu John, 2005 .

Photorefractive optical processing for data security

Kehar Singh, G. Unnikrishnan, Naveen Kumar Nishchal, 2002, SPIE Optics + Photonics.

Polychromatic light-based photorefractive correlator for 3D motion measurement

Kehar Singh, Renu Tripathi, G. S. Pati, 1999, Other Conferences.

Lensless complex data encoding for digital holographic whole information security

Kehar Singh, Joby Joseph, Anith Nelleri, 2008 .

Wavelet-assisted generalized fringe-adjusted nonzero order joint transform correlator for noise immunity and pattern discrimination

Kehar Singh, Renu Tripathi, G. S. Pati, 1999, Other Conferences.

An input-data page modulation scheme for content-addressable holographic digital data storage

Kehar Singh, Joby Joseph, Renu John, 2005 .

Simple technique for space-variant target detection using fractional correlation

Kehar Singh, Renu Tripathi, G. S. Pati, 1999, Other Conferences.

Noise immunity and pattern discrimination using wavelet feature-based generalized fringe-adjusted joint transform correlator

Kehar Singh, Renu Tripathi, G. S. Pati, 1999, Other Conferences.

Optical encryption techniques for data security

Kehar Singh, 2003, International Commission for Optics.

Three-dimensional object recognition from digital Fresnel hologram by wavelet matched filtering

Unnikrishnan Gopinathan, Kehar Singh, Joby Joseph, 2006 .

Securing information using fractional Fourier transform in digital holography [rapid communication]

Kehar Singh, Joby Joseph, Naveen Kumar Nishchal, 2004 .

Reliable Data Search in a Holographic Search Engine with Defocused Recording

Kehar Singh, Joby Joseph, Bhargab Das, 2010 .

Image encryption and decryption using fractional Fourier transform and radial Hilbert transform

Chandra Shakher, Madhusudan Joshi, Kehar Singh, 2008 .

Fractional Fourier transform: applications in information optics

Naveen K. Nishchal, Kehar Singh, 2002, SPIE/COS Photonics Asia.

Modified geometry of ring-wedge detector for sampling Fourier transform of fingerprints for classification using neural networks

Kehar Singh, Dinesh Ganotra, Joby Joseph, 2003, International Commission for Optics.

Optical encryption using quadratic phase systems

Kehar Singh, G. Unnikrishnan, G. Unnikrishnan, 2001 .

Phase image encryption of colored images using double random phase encoding technique in HSV color space

Chandra Shakher, Madhusudan Joshi, Kehar Singh, 2009 .

Modified geometry of ring-wedge detector for sampling Fourier transform of fingerprints for classification using neural networks

Kehar Singh, Dinesh Ganotra, Joby Joseph, 2004 .

Pattern discrimination using wavelet filters in a photorefractive joint-transform correlator

Kehar Singh, Renu Tripathi, Joby Joseph, 1997 .

Cryptography using optoelectronic techniques

Kehar Singh, G. Unnikrishnan, 2001, International Conference on Fiber Optics and Photonics.

Securing complex and multi-plane data in a lens-less digital holographic information system that uses position-phase-shifting geometry

Kehar Singh, Joby Joseph, Anith Nelleri, 2010 .

Corrigendum: Known-plaintext attack-free double random phase-amplitude optical encryption: vulnerability to impulse function attack Corrigendum: Known-plaintext attack-free double random phase-amplitude optical encryption: vulnerability to impulse function attack

Kehar Singh, Pramod Kumar, Joby Joseph, 2012 .

Experimental and simulation studies on the performance of binary and gray-valued joint transform correlators under poor illumination conditions and nonoverlapping background noise

Kehar Singh, G. S. Pati, G. Pati, 1997 .

Fully phase-based encryption using fractional order Fourier domain random phase encoding: error analysis

Kehar Singh, Joby Joseph, Naveen Kumar Nishchal, 2004 .

Optical encryption using a localized fractional Fourier transform

Kehar Singh, Joby Joseph, Naveen Kumar Nishchal, 2003 .

Fully phase-encrypted memory using cascaded extended fractional Fourier transform

Kehar Singh, Joby Joseph, Naveen Kumar Nishchal, 2004 .

Digital Fresnel field encryption for three-dimensional information security

Kehar Singh, Joby Joseph, Anith Nelleri, 2007 .

Simultaneous encryption of a color and a gray-scale image using byte-level encoding based on single-channel double random-phase encoding architecture in fractional Fourier domain

Madhusudan Joshi, Kehar Singh, 2011 .

Design of a Composite Wavelet Matched Filter Using Breeder Genetic Algorithm

Aloka Sinha, Kehar Singh, 2003 .

Wavelet based three-dimensional object recognition using single off-axis digital Fresnel hologram

Unnikrishnan Gopinathan, Kehar Singh, Joby Joseph, 2005, SPIE OPTO-Ireland.

Discrimination-sensitive rotation-invariant joint-transform correlator using gradient preprocessing and circular harmonic components

Kehar Singh, G. S. Pati, G. Pati, 1998 .

Image encryption using radial Hilbert transform filter bank as an additional key in the modified double random fractional Fourier encoding architecture

Chandra Shakher, Madhusudan Joshi, Kehar Singh, 2010 .

Optical security system using jigsaw transforms of the second random phase mask and the encrypted image in a double random phase encoding system

Kehar Singh, Arvind Kumar, M. M. Singh, 2008 .

A phase-image watermarking scheme in gyrator domain using devil's vortex Fresnel lens as a phase mask

Kehar Singh, Hukum Singh, A. K. Yadav, 2015 .

Pattern discrimination using a bank of wavelet filters in a joint transform correlator

Kehar Singh, Renu Tripathi, R. Tripathi, 1998 .

Speckle Coding for Optical and Digital Data Security Applications

Arvind Kumar, Madan Singh, Kehar Singh, 2011 .

Non-zero-order joint transform correlator using random phase function in the input plane

Kehar Singh, Joby Joseph, G. Unnikrishnan, 1999, Other Conferences.

Reply to comment on “A technique for image encryption using digital signature”

Aloka Sinha, Kehar Singh, 2006 .

Secure optical system that uses fully phase-based encryption and lithium niobate crystal as phase contrast filter for decryption

Kehar Singh, Arvind Kumar, M. M. Singh, 2008 .

Content-addressable holographic data storage system for invariant pattern recognition of gray-scale images.

Kehar Singh, Joby Joseph, Alpana Bhagatji, 2010, Applied optics.

Photorefractive Optical Cryptography: A Personal Tour

Kehar Singh, 2017 .

Profilometry for the measurement of three-dimensional object shape using radial basis function, and multi-layer perceptron neural networks

Kehar Singh, Dinesh Ganotra, Joby Joseph, 2002 .

Image encryption using fractional Mellin transform, structured phase filters, and phase retrieval

Kehar Singh, Hukum Singh, A. K. Yadav, 2014 .

The design of a composite wavelet matched filter for face recognition using breeder genetic algorithm

Aloka Sinha, Kehar Singh, 2005 .

Image feature extraction using a joint-transform-correlator-based Haar-wavelet processor

Kehar Singh, Renu Tripathi, G. S. Pati, 1999, Other Conferences.

Scheme for implementation of an all-optical non-zero-order joint transform correlator using contrast reversal technique

Kehar Singh, Renu Tripathi, G. S. Pati, 1999, Other Conferences.

Digital Holographic Encryption

Kehar Singh, Joby Joseph, Anith Nelleri, 2009 .

Impulse attack free double-random-phase encryption scheme with randomized lens-phase functions.

Arvind Kumar, Kehar Singh, Joby Joseph, 2009, Optics letters.

Securing Holographic Three-dimensional Information by Digital Fresnel Field Encryption

Kehar Singh, Joby Joseph, Anith Nelleri, 2006 .

Photorefractive correlators for optical pattern recognition and object motion measurement: some improved techniques

Kehar Singh, Renu Tripathi, 1999, Other Conferences.

Image encryption by using fractional fourier transform and jigsaw transform in image bit planes

Aloka Sinha, Kehar Singh, 2005 .

Neural networks applied to measurement of three-dimensional object shapes using phases recovered from Fourier transform profilometry and phase locked loops

Kehar Singh, Dinesh Ganotra, Joby Joseph, 2003, International Commission for Optics.

Numerical investigation on intensity-dependent energy transfer and beam fanning in high-gain photorefractive BaTiO3 crystal

Kehar Singh, G. S. Pati, Anushree Roy, 1997, Other Conferences.

Error analysis for a lens-less in-line digital holographic complex information security system based on double random phase encoding

Kehar Singh, Joby Joseph, Anith Nelleri, 2009 .

Fully phase encryption using fractional Fourier transform

Kehar Singh, Joby Joseph, Naveen Kumar Nishchal, 2003 .

Reliability of content-addressable data search in a defocused volume holographic data storage system.

Kehar Singh, Joby Joseph, Bhargab Das, 2010, Applied optics.

Holographic encryption system in the Fresnel domain with convergent random illumination

Pramod Kumar, Kehar Singh, Joby Joseph, 2010 .

Performance of optical systems in presence of image motion

Kehar Singh, C. L. Mehta, 1975 .

Known-plaintext attack-free double random phase-amplitude optical encryption: vulnerability to impulse function attack

Pramod Kumar, Kehar Singh, Joby Joseph, 2012 .

Fully phase encryption using digital holography

Kehar Singh, Joby Joseph, Naveen Kumar Nishchal, 2004 .

Recognition and classification of three-dimensional phase objects by digital Fresnel holography.

Kehar Singh, Joby Joseph, Anith Nelleri, 2006, Applied optics.

Some Experiments On The Perceived Size Of Laser Speckles

Kehar Singh, K. K. Gupta, R. D. Bahuguna, 1989, Other Conferences.

Double Random Phase Encoding Based Optical Encryption Systems Using Some Linear Canonical Transforms: Weaknesses and Countermeasures

Pramod Kumar, Kehar Singh, Joby Joseph, 2016 .

Color image encryption and decryption for twin images in fractional Fourier domain

Madhusudan Joshi, Kehar Singh, Chandrashakher, 2008 .

Optically nonlinear polymer: preparation and characterization of ceramic ultrastructure composites

Kehar Singh, P. K. C. Pillai, Tara C. Goel, 1998, Other Conferences.

Devil’s Vortex Phase Structure as Frequency Plane Mask for Image Encryption Using the Fractional Mellin Transform

Kehar Singh, Hukum Singh, A. K. Yadav, 2014 .

Object reconstruction in multilayer neural network based profilometry using grating structure comprising two regions with different spatial periods

Kehar Singh, Dinesh Ganotra, Joby Joseph, 2004 .

Double random fractional Fourier domain encoding for optical security

Kehar Singh, G. Unnikrishnan, G. Unnikrishnan, 2000 .

Impulse attack-free four random phase mask encryption based on a 4-f optical system.

Kehar Singh, Joby Joseph, Pramod Kumar, 2009, Applied optics.

Color image encryption and decryption using fractional Fourier transform

Madhusudan Joshi, Kehar Singh, Chandrashakher, 2007 .

Watermarking in gyrator domain using an asymmetric cryptosystem

Kehar Singh, A. K. Yadav, Sunanda Vashisth, 2015, Other Conferences.

Vulnerability of the security enhanced double random phase-amplitude encryption scheme to point spread function attack

Pramod Kumar, Arvind Kumar, Kehar Singh, 2012 .

Security analysis and modified attack algorithms for a nonlinear optical cryptosystem based on DRPE

Ravi Kumar, Kehar Singh, Phool Singh, 2021 .

Neural network based face recognition by using diffraction pattern sampling with a digital ring–wedge detector

Kehar Singh, Dinesh Ganotra, Joby Joseph, 2002 .

Logarithms-based RGB image encryption in the fractional Fourier domain : A non-linear approach

Chandra Shakher, Madhusudan Joshi, Kehar Singh, 2009 .

Phase-image-based sparse-gray-level data pages for holographic data storage.

Kehar Singh, Joby Joseph, Bhargab Das, 2009, Applied optics.

Fractional Fourier plane image encryption technique using radial hilbert-, and Jigsaw transform

Chandra Shakher, Madhusudan Joshi, Kehar Singh, 2010 .

Fully phase encrypted memory using cascaded extended fractional Fourier transform

Naveen K. Nishchal, Kehar Singh, Joby Joseph, 2003, SPIE Optics + Photonics.

Tight Focusing of Optical Beams; A Review - Part 1

Kehar Singh, P. Senthilkumaran, Rakesh Singh, 2008 .

Double phase-image encryption using gyrator transforms, and structured phase mask in the frequency plane

Kehar Singh, Hukum Singh, A. K. Yadav, 2015 .

Phase modulated gray-scale data pages for digital holographic data storage

Kehar Singh, Joby Joseph, Bhargab Das, 2009 .

Optical image encryption based on interference under convergent random illumination

Pramod Kumar, Kehar Singh, Joby Joseph, 2010 .

Pattern recognition using versatile hybrid joint transform correlators: some techniques for improving the performance

Kehar Singh, G. S. Pati, 1999, Other Conferences.

Optical encryption system using a spatial light modulator

Kehar Singh, Joby Joseph, G. Unnikrishnan, 1999, Other Conferences.

Performance study of binary and real-valued joint-transform correlators in the presence of noisy input scene and poor illumination

Kehar Singh, G. S. Pati, 1997, Other Conferences.

Phase-image-based content-addressable holographic data storage

Kehar Singh, Joby Joseph, Renu John, 2004 .

Fully phase image encryption using double random-structured phase masks in gyrator domain.

Kehar Singh, Hukum Singh, Sunanda Vashisth, 2014, Applied optics.

Optical image encryption using a jigsaw transform for silhouette removal in interference-based methods and decryption with a single spatial light modulator.

Kehar Singh, Joby Joseph, Pramod Kumar, 2011, Applied optics.

A technique for image encryption using digital signature

Aloka Sinha, Kehar Singh, A. Sinha, 2003 .

Effect of primary spherical aberration on high-numerical-aperture focusing of a Laguerre-Gaussian beam.

Kehar Singh, Rakesh Kumar Singh, P. Senthilkumaran, 2008, Journal of the Optical Society of America. A, Optics, image science, and vision.

Securing multiplexed information by in-plane rotation of random phase diffusers constituting a sandwich diffuser placed in the Fourier plane of a double random phase encoding system

Kehar Singh, M. M. Singh, Arvind Kumar, 2009 .

Object tilt measurement using a photorefractive speckle correlator: theoretical and experimental analysis

Kehar Singh, Renu Tripathi, G. S. Pati, 1998 .

Spatial amplification via photorefractive two-beam coupling; real-time image processing using controllable erasure of Fourier spectrum

Kehar Singh, Joby Joseph, J. Joseph, 1991 .

Optical Cryptography and Watermarking Using Some Fractional Canonical Transforms, and Structured Masks

Kehar Singh, Hukum Singh, Sunanda Vashisth, 2015 .

Performance analysis of content-addressable search and bit-error rate characteristics of a defocused volume holographic data storage system.

Kehar Singh, Joby Joseph, Bhargab Das, 2007, Applied optics.

Improved data search by zero-order (dc) peak filtering in a defocused volume holographic content-addressable memory.

Kehar Singh, Joby Joseph, Bhargab Das, 2009, Applied optics.

Measurement of three-dimensional rigid body motion by multiple exposure speckle photography: use of uncollimated beam illumination in free space geometry

Kehar Singh, Atul Kumar, Atul Kumar, 1992 .

A new balanced modulation code for a phase-image-based holographic data storage system

Kehar Singh, Joby Joseph, Renu John, 2005 .

Out-of-plane displacement measurement using multiple-exposure speckle recording in BaTiO3 crystal : use of converging beam illumination in free space geometry

Kehar Singh, Kanwal Kamra, Arvind Kumar, 1996 .

Analysis of Image-Forming Properties of a Fiber Assembly Used as a Dynamic Scanner

Kehar Singh, P. K. Katti, A. K. Kavathekar, 1970 .

Three-dimensional displacement measurement using chirp modulation in a photorefractive correlator

Kehar Singh, Renu Tripathi, G. S. Pati, 1998 .

Optical image encryption in the fractional Hartley domain, using Arnold transform and singular value decomposition

Indu Saini, Kehar Singh, Phool Singh, 2017 .

Partial Differential Equations for Engineers and Scientists

J. N. Sharma, Kehar Singh, 2000 .

Phase image encryption in the fractional Hartley domain using Arnold transform and singular value decomposition

Kehar Singh, Phool Singh, A. K. Yadav, 2017 .

A new phase-conjugate one-way scheme for phase-distortion correction

Kehar Singh, Joby Joseph, P. K. C. Pillai, 1990 .

Second- and first-order phase-locked loops in fringe profilometry and application of neural networks for phase-to-depth conversion

Kehar Singh, Dinesh Ganotra, Joby Joseph, 2003 .

Membrane potential studies on cholesterol liquid membranes

Kehar Singh, Kehar Singh, Ajit Tiwari, 1987 .

Optical Image Encryption Using Devil’s Vortex Toroidal Lens in the Fresnel Transform Domain

Kehar Singh, Hukum Singh, Sunanda Vashisth, 2015 .

Multiple-exposure speckle photography of the out-of-plane motion : comparative performance of filtering by collimated and converging beams

Kehar Singh, Arvind Kumar, 1990 .

Holographic digital data storage using phase-modulated pixels

Kehar Singh, Joby Joseph, Renu John, 2005 .

Phase-image-based content-addressable holographic data storage with security

Kehar Singh, Joby Joseph, Renu John, 2005 .

Optical phase encryption by phase contrast using electrically addressed spatial light modulator

Kehar Singh, Joby Joseph, Naveen Kumar Nishchal, 2003 .

Transmission type twisted nematic liquid crystal display for three gray-level phase-modulated holographic data storage systems

Kehar Singh, Joby Joseph, P. Senthilkumaran, 2009 .

Electrochemical studies on Nafion membrane

Kehar Singh, Veena Shahi, 1998 .

Analysis and Comparison of Image Encryption Algorithms

Kehar Singh, N. G. Bourbakis, Tung-Shou Chen, 2004 .

Multiplexing in optical encryption by using an aperture system and a rotating sandwich random phase diffuser in the Fourier plane

Kehar Singh, M. M. Singh, Arvind Kumar, 2008 .

Crystal orientation dependence of the SNR for signal beam amplification in photorefractive BaTiO3

Kehar Singh, Joby Joseph, P.K.C. Pillai, 1991 .

Encryption by using matrix-added, or matrix-multiplied input images placed in the input plane of a double random phase encoding geometry

Kehar Singh, M. M. Singh, Arvind Kumar, 2009 .

Double random phase encryption with in-plane rotation of a modified Lohmann's second- type system in the anamorphic fractional Fourier domain

Kehar Singh, Joby Joseph, Pramod Kumar, 2008 .

Expected number of intensity level crossings in a normal speckle pattern

Kehar Singh, R. D. Bahuguna, R. Bahuguna, 1980 .

Encryption and decryption using a sandwich phase diffuser made by using two speckle patterns and placed in the Fourier plane: Simulation results

Kehar Singh, M. M. Singh, Arvind Kumar, 2009 .

Purple membrane for conversion of light into electric current

Kehar Singh, S. Roy Caplan, Helene Lebedeva, 1980 .

Material saturation in photopolymer holographic data recording and its effects on bit-error-rate and content-addressable search

Kehar Singh, Joby Joseph, Bhargab Das, 2009 .

A novel way of noise reduction in image amplification by two-beam coupling in photorefractive BaTiO3 crystal

Kehar Singh, Joby Joseph, P.K.C. Pillai, 1990 .