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Author = Hennelly, Bryan M.;
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Displaying Results 1 - 25 of 78 on page 1 of 4
Marked
Mark
A Practical Guide to Digital Holography and Generalized Sampling
(2008)
Kelly, D.P.; Hennelly, Bryan M.; McElhinney, Conor P.; Naughton, Thomas J.
A Practical Guide to Digital Holography and Generalized Sampling
(2008)
Kelly, D.P.; Hennelly, Bryan M.; McElhinney, Conor P.; Naughton, Thomas J.
Abstract:
The theorems of Nyquist, Shannon and Whittaker have long held true for sampling optical signals. They showed that a signal (with finite bandwidth) should be sampled at a rate at least as fast as twice the maximum spatial frequency of the signal. They proceeded to show how the continuous signal could be reconstructed perfectly from its well sampled counterpart by convolving a Sinc function with the sampled signal. Recent years have seen the emergence of a new generalized sampling theorem of which Nyquist Shannon is a special case. This new theorem suggests that it is possible to sample and reconstruct certain signals at rates much slower than those predicted by Nyquist-Shannon. One application in which this new theorem is of considerable interest is Fresnel Holography. A number of papers have recently suggested that the sampling rate for the digital recording of Fresnel holograms can be relaxed considerably. This may allow the positioning of the object closer to the camera allowing f...
http://mural.maynoothuniversity.ie/2358/
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A Projection System for Real World Three-Dimensional Objects Using Spatial Light Modulators
(2008)
Gopinathan, Unnikrishnan; Monaghan, David S.; Hennelly, Bryan M.; McElhinney, Conor P.;...
A Projection System for Real World Three-Dimensional Objects Using Spatial Light Modulators
(2008)
Gopinathan, Unnikrishnan; Monaghan, David S.; Hennelly, Bryan M.; McElhinney, Conor P.; Kelly, Damien P.; McDonald, John; Naughton, Thomas J.; Sheridan, John T.
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.
http://mural.maynoothuniversity.ie/5750/
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Additional sampling criterion for the linear canonical transform
(2008)
Healy, J.J.; Hennelly, Bryan M.; Sheridan, John T.
Additional sampling criterion for the linear canonical transform
(2008)
Healy, J.J.; Hennelly, Bryan M.; Sheridan, John T.
Abstract:
The linear canonical transform describes the effect of first-order quadratic phase optical systems on a wave field. Several recent papers have developed sampling rules for the numerical approximation of the transform. However, sampling an analog function according to existing rules will not generally permit the reconstruction of the analog linear canonical transform of that function from its samples. To achieve this, an additional sampling criterion has been developed for sampling both the input and the output wave fields.
http://mural.maynoothuniversity.ie/8717/
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Additional sampling criterion for the linear canonical transform
(2011)
Healy, John J.; Hennelly, Bryan M.; Sheridan, John T.
Additional sampling criterion for the linear canonical transform
(2011)
Healy, John J.; Hennelly, Bryan M.; Sheridan, John T.
Abstract:
The linear canonical transform describes the effect of first-order quadratic phase optical systems on a wave field. Several recent papers have developed sampling rules for the numerical approximation of the transform. However, sampling an analog function according to existing rules will not generally permit the reconstruction of the analog linear canonical transform of that function from its samples. To achieve this, an additional sampling criterion has been developed for sampling both the input and the output wave fields.
Science Foundation Ireland
Irish Research Council for Science, Engineering and Technology
FÁS
pe, la, ke, ab, sp - kpw9/11/11
http://hdl.handle.net/10197/3363
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Algorithm for optimal denoising of Raman spectra
(2018)
Barton, Sinead J.; Ward, Tomás E.; Hennelly, Bryan M.
Algorithm for optimal denoising of Raman spectra
(2018)
Barton, Sinead J.; Ward, Tomás E.; Hennelly, Bryan M.
Abstract:
Raman spectroscopy has been demonstrated to have diagnostic potential in areas such as urine and cervical cytology, whereby different disease groups can be classified based on subtle differences in the cell or tissue spectra using various multi-variate statistical classification tools. However, Raman scattering is an inherently weak process, which often results in low signal to noise ratios, thus limiting the method's diagnostic capabilities under certain conditions. A common approach for reducing the experimental noise is Savitzky–Golay smoothing. While this method is effective in reducing the noise signal, it has the undesirable effect of smoothing the underlying Raman features, compromising their discriminative utility. Maximum likelihood estimation is a method for estimating the parameters of a statistical model given an available dataset and a priori knowledge of the model type. In this paper, we demonstrate how Savitzky– Golay smoothing may be enhanced with maximum likeli...
http://doras.dcu.ie/22844/
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Algorithm for optimal denoising of Raman spectra
(2018)
Barton, Sinead; Ward, Tomas E.; Hennelly, Bryan M.
Algorithm for optimal denoising of Raman spectra
(2018)
Barton, Sinead; Ward, Tomas E.; Hennelly, Bryan M.
Abstract:
Raman spectroscopy has been demonstrated to have diagnostic potential in areas such as urine and cervical cytology, whereby different disease groups can be classified based on subtle differences in the cell or tissue spectra using various multi-variate statistical classification tools. However, Raman scattering is an inherently weak process, which often results in low signal to noise ratios, thus limiting the method’s diagnostic capabilities under certain conditions. A common approach for reducing the experimental noise is Savitzky-Golay smoothing. While this method is effective in reducing the noise signal, it has the undesirable effect of smoothing the underlying Raman features, compromising their discriminative utility. Maximum Likelihood Estimation is a method for estimating the parameters of a statistical model given an available dataset and a priori knowledge of the model type. In this paper, we demonstrate how Savitzky-Golay smoothing may be enhanced with Maximum Likelihood E...
http://mural.maynoothuniversity.ie/13130/
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Applications of Raman spectroscopy to the urinary bladder for cancer diagnostics
(2014)
Kerr, Laura; Domijan, Katarina; Cullen, Ivor; Hennelly, Bryan M.
Applications of Raman spectroscopy to the urinary bladder for cancer diagnostics
(2014)
Kerr, Laura; Domijan, Katarina; Cullen, Ivor; Hennelly, Bryan M.
Abstract:
Biomolecular changes associated with cancer progression can be identified using Raman spectroscopy, allowing for this technique to be utilized as a non-invasive tool for the diagnosis of bladder cancer. Applications of Raman spectroscopy for diagnostics in real-time have consistently produced higher sensitivities and specificities than current clinical methods. This technique can be applied in vivo during bladder visualization (cystoscopic) procedures as an “optical biopsy” or in vitro to cells obtained from urine cytology specimens. This review follows the evolution of studies in this field from the first in vitro experiment to the most recent in vivo application, identifies how diagnostic algorithms are developed, and provides molecular information associated with the etiology of the biochemical continuum of disease progression. Future prospects for the application of Raman spectroscopy in bladder cancer diagnostics are also discussed.
http://mural.maynoothuniversity.ie/10014/
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Applications of Spatial Light Modulators in Optical Signal Processing Systems
(2005)
Monaghan, David S.; Gopinathan, Unnikrishnan; Hennelly, Bryan M.; Kelly, Damien P.; Nau...
Applications of Spatial Light Modulators in Optical Signal Processing Systems
(2005)
Monaghan, David S.; Gopinathan, Unnikrishnan; Hennelly, Bryan M.; Kelly, Damien P.; Naughton, Thomas J.; Sheridan, J. T.
Abstract:
Coherent optical signal processors, due to their ability to process and relay information in two dimensions, have been receiving increasing attention in recent years. These systems involve a coherent field being propagated through some bulk optical system consisting of thin lenses and sections of free space (such paraxial systems being described mathematically using the Linear Canonical Transformation). A Spatial Light Modulator (SLM) may be used to modulate the input digital data onto a coherent wave-field as well as to modulate the amplitude and/or phase of the complex wave-field at any desired plane. The complex field (amplitude and phase) at any desired plane may be recorded quantitatively using a CCD camera, using digital holographic techniques allowing the further processing of data digitally. Such hybrid optoelectronic systems have applications for 2D and 3D data processing covering fields as diverse as data storage, data security and pattern recognition. But devices such as ...
http://mural.maynoothuniversity.ie/8393/
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Comment on the paper: H.-E. Hwang, P. Han, Theoretical analysis for surface tilt and translation detection based on speckle photography in the Fresnel domain, Opt. Commun. 282 (2009) 351–354
(2009)
Ward, Jennifer E.; Kelly, Damien P.; Hennelly, Bryan M.; Sheridan, John T.
Comment on the paper: H.-E. Hwang, P. Han, Theoretical analysis for surface tilt and translation detection based on speckle photography in the Fresnel domain, Opt. Commun. 282 (2009) 351–354
(2009)
Ward, Jennifer E.; Kelly, Damien P.; Hennelly, Bryan M.; Sheridan, John T.
Abstract:
In a recent paper [H.-E. Hwang, P. Han, Opt. Commun. 282 (2009) 351] a speckle based metrology system is proposed which it is claimed provides significant advantages over existing systems. In this paper, we show that the discussion presented in [H.-E. Hwang, P. Han, Opt. Commun. 282 (2009) 351] is deficient, and that several of the statements made are incorrect and/or misleading.
http://mural.maynoothuniversity.ie/5766/
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Digital computation of the complex linear canonical transform
(2011)
Liu, Changgeng; Wang, Dayong; Healy, John J.; Hennelly, Bryan M.; Sheridan, John T.; Ki...
Digital computation of the complex linear canonical transform
(2011)
Liu, Changgeng; Wang, Dayong; Healy, John J.; Hennelly, Bryan M.; Sheridan, John T.; Kim, Myung K.
Abstract:
An efficient algorithm for the accurate computation of the linear canonical transform with complex transform parameters and with complex output variable is presented. Sampling issues are discussed and the requirements for different cases given. Simulations are provided to validate the results.
Other funder
The Science Foundation of Education Commission of Beijing under grant KZ20091 0005001
The Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of Beijing Municipality
http://hdl.handle.net/10197/3294
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Digital computation of the complex linear canonical transform
(2011)
Liu, Chenggeng; Wang, Dayong; Healy, J.J.; Hennelly, Bryan M.; Sheridan, John T.; Kim, ...
Digital computation of the complex linear canonical transform
(2011)
Liu, Chenggeng; Wang, Dayong; Healy, J.J.; Hennelly, Bryan M.; Sheridan, John T.; Kim, Myung K.
Abstract:
An efficient algorithm for the accurate computation of the linear canonical transform with complex transform parameters and with complex output variable is presented. Sampling issues are discussed and the requirements for different cases given. Simulations are provided to validate the results.
http://mural.maynoothuniversity.ie/8722/
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Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays
(2010)
Kelly, Damien P.; Monaghan, David S.; Pandey, Nitesh; Kozacki, Tomasz; Michalkiewicz, A...
Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays
(2010)
Kelly, Damien P.; Monaghan, David S.; Pandey, Nitesh; Kozacki, Tomasz; Michalkiewicz, Aneta; Finke, Grzegorz; Hennelly, Bryan M.; Kujawinska, Malgorzata
Abstract:
The application of digital holography as a viable solution to 3D capture and display technology is examined. A review of the current state of the field is presented in which some of the major challenges involved in a digital holographic solution are highlighted. These challenges include (i) the removal of the DC and conjugate image terms, which are features of the holographic recording process, (ii) the reduction of speckle noise, a characteristic of a coherent imaging process, (iii) increasing the angular range of perspective of digital holograms (iv) and replaying captured and/or processed digital holograms using spatial light modulators. Each of these challenges are examined theoretically and several solutions are put forward. Experimental results are presented that demonstrate the validity of the theoretical solutions.
http://mural.maynoothuniversity.ie/5767/
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Digital Holographic Superresolution by Rotating the Object Wavefield
(2007)
Hennelly, Bryan M.; Naughton, Thomas J.; McDonald, John
Digital Holographic Superresolution by Rotating the Object Wavefield
(2007)
Hennelly, Bryan M.; Naughton, Thomas J.; McDonald, John
Abstract:
We create superresolved digital holograms by stitching together multiple holograms of 3-D objects. The object wavefield is rotated between captures and stitched together using digital signal processing techniques. The numerical aperture is increased significantly.
http://mural.maynoothuniversity.ie/8344/
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Digital image watermarking spread-space spread-spectrum technique based on Double Random Phase Encoding
(2012)
Liu, Shi; Hennelly, Bryan M.; Sheridan, John T.
Digital image watermarking spread-space spread-spectrum technique based on Double Random Phase Encoding
(2012)
Liu, Shi; Hennelly, Bryan M.; Sheridan, John T.
Abstract:
In this paper a digital invisible image watermarking technique is proposed based on the numerical simulation of optical Double Random Phase Encoding (DRPE). This technique utilizes the capability of the DRPE to spread the energy of the input information in both the space and the spatial frequency domains using two diffusers. The watermark is in the form of a digital barcode image which is numerically encrypted using a simulation of the optical DRPE process. This produces a random complex image, which is then processed to form a real valued random image with a low number of quantization levels. This signal is added to the host image. Extraction of the barcode, involves applying an inverse DRPE process to the watermarked image followed by a low pass filter. The results presented indicate the feasibility and robustness of the proposed method and it is demonstrated that even when using very few quantization levels, i.e. 2-levels, the watermark can still be extracted with very small errors.
http://mural.maynoothuniversity.ie/6692/
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Dual-wavelength image-plane digital holography for dynamic measurement
(2009)
Fu, Yu; Pedrini, Giancarlo; Hennelly, Bryan M.; Groves, Roger M.; Osten, Wolfgang
Dual-wavelength image-plane digital holography for dynamic measurement
(2009)
Fu, Yu; Pedrini, Giancarlo; Hennelly, Bryan M.; Groves, Roger M.; Osten, Wolfgang
Abstract:
A dual-wavelength image-plane digital holography, combined with a windowed Fourier analysis, is presented for dynamic measurement of a vibrating object. In order to expand the range of the velocity measurement, the object is simultaneously illuminated by two lasers with different wavelengths. A sequence of digital holograms of a vibrating object is captured by a CCD camera and two wrapped phase maps are retrieved from each digital hologram. At each instant, a new phase distribution with a synthetic wavelength is obtained by subtracting these two wrapped phase maps. A windowed Fourier analysis is then applied spatially and temporally to retrieve the high-precision displacement and velocity of the tested object. Experimental results show the requirement on the camera capture frequency is reduced by the proposed method.
http://mural.maynoothuniversity.ie/5769/
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Effect of additive noise on phase measurement in digital holographic microscopy
(2011)
Pandey, Nitesh; Hennelly, Bryan M.
Effect of additive noise on phase measurement in digital holographic microscopy
(2011)
Pandey, Nitesh; Hennelly, Bryan M.
Abstract:
Digital holographic microscopy is a quantitative phase measurement technique that can provide nanometer resolution of the thickness or surface profile of an object. We analyze the influence of additive noise in the hologram plane on the accuracy of phase measurement. We analyze Gaussian distributed and Poisson distributed shot noise in the camera plane and we develop a model for quantifying the phase error in the reconstructed phase.
http://mural.maynoothuniversity.ie/8714/
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Extended focused imaging for digital holograms of macroscopic three-dimensional objects
(2008)
McElhinney, Conor P.; Hennelly, Bryan M.; Naughton, Thomas J.
Extended focused imaging for digital holograms of macroscopic three-dimensional objects
(2008)
McElhinney, Conor P.; Hennelly, Bryan M.; Naughton, Thomas J.
Abstract:
When a digital hologram is reconstructed, only points located at the reconstruction distance are in focus. We have developed a novel technique for creating an in-focus image of the macroscopic objects encoded in a digital hologram. This extended focused image is created by combining numerical reconstructions with depth information extracted by using our depth-from-focus algorithm. To our knowledge, this is the first technique that creates extended focused images of digital holograms encoding macroscopic objects. We present results for digital holograms containing low- and high-contrast macroscopic objects.
http://mural.maynoothuniversity.ie/5770/
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Extended viewing angle holographic display system with tilted SLMs in a circular configuration
(2012)
Kozacki, Tomasz; Kujawinska, Malgorzata; Finke, Grzegorz; Hennelly, Bryan M.
Extended viewing angle holographic display system with tilted SLMs in a circular configuration
(2012)
Kozacki, Tomasz; Kujawinska, Malgorzata; Finke, Grzegorz; Hennelly, Bryan M.
Abstract:
This paper presents an extended viewing angle holographic display for reconstruction of real world objects in which the capture and display systems are decoupled. This is achieved by employing multiple tilted spatial light modulators (SLMs) arranged in a circular configuration. In order to prove the proper reconstruction and visual perception of holographic images the Wigner distribution function is employed. We describe both the capture system using a single static camera with a rotating object and a holographic display utilizing six tilted SLMs. The experimental results based on the reconstruction of computer generated and real world scenes are presented. The coherent noise removal procedure is described and implemented. The experiments prove the possibility to view images reconstructed in the display binocularly and with good quality.
http://mural.maynoothuniversity.ie/5771/
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Extraction and reconstruction of shape information from a digital hologram of three-dimensional objects
(2006)
McElhinney, Conor P.; Maycock, Jonathan; Hennelly, Bryan M.; Naughton, Thomas J.; McDon...
Extraction and reconstruction of shape information from a digital hologram of three-dimensional objects
(2006)
McElhinney, Conor P.; Maycock, Jonathan; Hennelly, Bryan M.; Naughton, Thomas J.; McDonald, John; Javidi, Bahram
Abstract:
We present a technique to convert a digital hologram of a three-dimensional object into a surface profile of the object. A depth-from-defocus technique is used to generate a depth map for a particular reconstructed perspective of the scene. The Fresnel transform is used to effect defocus. This depth map is then used to create an extended focused image of the object. Through the combination of the extended focused image and the depth map we are able to reconstruct a pseudo three-dimensional representation of the object. Our method produces depth maps of a significantly higher resolution than current autofocus methods. The technique could be used in registration and three-dimensional object recognition applications.
http://mural.maynoothuniversity.ie/8303/
Marked
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Fast numerical algorithm for the linear canonical transform
(2005)
Hennelly, Bryan M.; Sheridan, John T.
Fast numerical algorithm for the linear canonical transform
(2005)
Hennelly, Bryan M.; Sheridan, John T.
Abstract:
The linear canonical transform (LCT) describes the effect of any quadratic phase system (QPS) on an input optical wave field. Special cases of the LCT include the fractional Fourier transform (FRT), the Fourier transform (FT), and the Fresnel transform (FST) describing free-space propagation. Currently there are numerous efficient algorithms used (for purposes of numerical simulation in the area of optical signal processing) to calculate the discrete FT, FRT, and FST. All of these algorithms are based on the use of the fast Fourier transform (FFT). In this paper we develop theory for the discrete linear canonical transform (DLCT), which is to the LCT what the discrete Fourier transform (DFT) is to the FT. We then derive the fast linear canonical transform (FLCT), an NlogN algorithm for its numerical implementation by an approach similar to that used in deriving the FFT from the DFT. Our algorithm is significantly different from the FFT, is based purely on the properties of the LCT, ...
http://mural.maynoothuniversity.ie/8719/
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Fast numerical algorithm for the linear canonical transform
(2011)
Hennelly, Bryan M.; Sheridan, John T.
Fast numerical algorithm for the linear canonical transform
(2011)
Hennelly, Bryan M.; Sheridan, John T.
Abstract:
The linear canonical transform (LCT) describes the effect of any quadratic phase system (QPS) on an input optical wave field. Special cases of the LCT include the fractional Fourier transform (FRT), the Fourier transform (FT), and the Fresnel transform (FST) describing free-space propagation. Currently there are numerous efficient algorithms used (for purposes of numerical simulation in the area of optical signal processing) to calculate the discrete FT, FRT, and FST. All of these algorithms are based on the use of the fast Fourier transform (FFT). In this paper we develop theory for the discrete linear canonical transform (DLCT), which is to the LCT what the discrete Fourier transform (DFT) is to the FT. We then derive the fast linear canonical transform (FLCT), an N log N algorithm for its numerical implementation by an approach similar to that used in deriving the FFT from the DFT. Our algorithm is significantly different from the FFT, is based purely on the properties of the LCT,...
http://hdl.handle.net/10197/3368
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Finite-aperture effects for Fourier transform systems with convergent illumination. Part II: 3-D system analysis
(2006)
Kelly, Damien P.; Hennelly, Bryan M.; Sheridan, John T.; Rhodes, William T.
Finite-aperture effects for Fourier transform systems with convergent illumination. Part II: 3-D system analysis
(2006)
Kelly, Damien P.; Hennelly, Bryan M.; Sheridan, John T.; Rhodes, William T.
Abstract:
One of the most important optical signal processing operations is the optical Fourier transform (OFT). Of the arrangements for implementation of the OFT, perhaps the most flexible is that for the scaled optical Fourier transform (SOFT), as it allows control over the scale of the output Fourier transform distribution. By means of an analysis in cylindrical coordinates, we examine some of the practical limits introduced by the use of a thin lens of finite aperture in the implementation of the SOFT. Using simple rules of thumb that are based on an examination of the phase and magnitude deviations from the ideal (infinite-lens) diameter case, we define a volume inside the geometric shadow, which we refer to as a sub-geometric shadow. We then show that inside this sub-geometric shadow errors introduced by diffraction can be quantified.
http://mural.maynoothuniversity.ie/5773/
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Fixed-point numercial-reconstruction for digital holographic microscopy
(2010)
Pandey, Nitesh; Hennelly, Bryan M.
Fixed-point numercial-reconstruction for digital holographic microscopy
(2010)
Pandey, Nitesh; Hennelly, Bryan M.
Abstract:
In this Letter, we study the reconstruction of digital holograms of microscopic objects using a fixed-point representation of the numercial-reconstruction process. For different bit levels in our fixed-point reconstruction algorithm, we investigate the errors introduced to both the reconstructed image intensity and the unwrapped quantitative phase information. Experimental results based on a microscopic lens array are provided.
http://mural.maynoothuniversity.ie/5775/
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Focused image creation approaches for macroscopic objects encoded in digital holograms
(2008)
McElhinney, Conor P.; Hennelly, Bryan M.; Naughton, Thomas J.
Focused image creation approaches for macroscopic objects encoded in digital holograms
(2008)
McElhinney, Conor P.; Hennelly, Bryan M.; Naughton, Thomas J.
Abstract:
When a digital hologram is reconstructed only points on objects within the depth of focus at the reconstruction distance are in focus. For complex scenes, scenes containing multiple objects or multiple object features located at different depths, this can lead to a reconstruction with large blurred regions. Using a depth-from-focus algorithm we have developed an approach to extract an objects depth information in the form of a depth map from volumes of reconstructions, where each reconstruction in the volume is a reconstruction at a different focal plane. By combining the depth map with the volume of reconstructions used to calculate the depth map we can create an image, an extended focus image, where the full scene is in focus. To our knowledge, this is the first technique which creates extended focused images of digital holograms encoding macroscopic objects. We present results for digital holograms containing low and high contrast macroscopic objects.
http://mural.maynoothuniversity.ie/8458/
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Fractional Fourier transform-based image encryption: phase retrieval algorithm
(2003)
Hennelly, Bryan M.; Sheridan, J. T.
Fractional Fourier transform-based image encryption: phase retrieval algorithm
(2003)
Hennelly, Bryan M.; Sheridan, J. T.
Abstract:
A number of methods have been proposed in the literature for the encryption of two-dimensional image information using optical systems based on the fractional Fourier transform (FRT). We present an image encryption technique, which is based on a recently proposed method of phase retrieval using the FRT. The optical implementation of the method is mentioned and digital simulations are presented. The technique is shown to be a powerful method of digital data and image encryption. In this paper, we outline the implementation of the algorithm and examine the sensitivities of the various encryption keys. We also compare the performance of the new technique to digital implementations of other FRT-based optical encryption schemes.
http://mural.maynoothuniversity.ie/5808/
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