Scholars@Duke
Nikos Pitsianis

Nikos Pitsianis

Adjunct Associate Professor of Computer Science
Computer Science
Nikos.P.Pitsianis@duke.edu
Box 90129, Durham, NC 27708-0129
D111 LSRC, Dept of Comp Science, Durham, NC 27708

Selected Publications

A Review and Case Study of Neural Network Techniques for Automated Generation of High Level-of-Detail 3D City Models

Conference Springer Proceedings in Mathematics and Statistics · January 1, 2023 The growing interest in creating digital twins of cities has sparked a surge in the development of detailed 3D models. In this paper we examine the current state-of-the-art in generating high-resolution 3D models of cities using neural network techniques. ... Full text Cite

Parallel Clustering with Resolution Variation

Conference 2023 IEEE High Performance Extreme Computing Conference, HPEC 2023 · January 1, 2023 We introduce a novel approach for parallel data clustering with resolution variation. Conventional graph clustering is typically governed by a function defined over all possible cluster configurations but at a fixed value of the resolution hyperparameter d ... Full text Cite

STORK: Collaborative Online Monitoring of Pregnancies Complicated with Gestational Diabetes Mellitus.

Journal Article Healthcare (Basel, Switzerland) · March 2022 Background: A novel digital platform, named STORK, was developed in the COVID-19 pandemic when clinic visits were restricted. A study of its clinical use during the pandemic was conducted. The study aims to advance the state of the art in monitoring and ca ... Full text Cite

Fast Graph Algorithms for Superpixel Segmentation

Conference 2022 IEEE High Performance Extreme Computing Conference, HPEC 2022 · January 1, 2022 We introduce the novel graph-based algorithm SLAM (simultaneous local assortative mixing) for fast and high-quality superpixel segmentation of any large color image. Super-pixels are compact semantic image elements; superpixel segmen-tation is fundamental ... Full text Cite

Digraph Clustering by the BlueRed Method

Conference 2021 IEEE High Performance Extreme Computing Conference, HPEC 2021 · January 1, 2021 We introduce a new method for vertex clustering or community detection on directed graphs (digraphs). The new method is an extension of the BlueRed method introduced initially for undirected graphs. Complementary to supervised or semisupervised classificat ... Full text Cite

Fast Graphlet Transform of Sparse Graphs

Journal Article 2020 IEEE High Performance Extreme Computing Conference, HPEC 2020 · September 22, 2020 We introduce the computational problem of graphlet transform of a sparse graph. Graphlets are fundamental topology elements of all graphs/networks. They can be used as coding elements to encode graph-topological information at multiple granularity levels, ... Full text Cite

Using Graphlet Spectrograms for Temporal Pattern Analysis of Virus-Research Collaboration Networks.

Journal Article ArXiv · September 1, 2020 We introduce a new method for temporal pattern analysis of scientific collaboration networks. We investigate in particular virus research activities through five epidemic or pandemic outbreaks in the recent two decades and in the ongoing pandemic with COVI ... Link to item Cite

Spaceland embedding of sparse stochastic graphs

Journal Article 2019 IEEE High Performance Extreme Computing Conference, HPEC 2019 · September 1, 2019 We introduce SG-t-SNE, a nonlinear method for embedding stochastic graphs/networks into d-dimensional spaces, d = 1, 2, 3, without requiring vertex features to reside in, or be transformed into, a metric space. Graphs/networks are relational data, prevalen ... Full text Cite

SG-t-SNE-Π: Swift Neighbor Embedding of Sparse Stochastic Graphs

Journal Article Journal of Open Source Software · July 31, 2019 Full text Cite

Sparse Dual of the Density Peaks Algorithm for Cluster Analysis of High-dimensional Data

Conference 2018 IEEE High Performance Extreme Computing Conference, HPEC 2018 · November 26, 2018 The density peaks (DP) algorithm for cluster analysis, introduced by Rodriguez and Laio in 2014, has proven empirically competitive or superior in multiple aspects to other contemporary clustering algorithms. Yet, it suffers from certain drawbacks and limi ... Full text Cite

An introduction to an array memory processor for application specific acceleration

Conference 2017 IEEE High Performance Extreme Computing Conference, HPEC 2017 · October 30, 2017 In this paper, we introduce an Array Memory (AM) processor. The AM processor uses a shared memory network amenable to on-chip 3D stacking. Node couplings use a 1 to K adjacency of connections in each dimension of communication of an array of nodes, such as ... Full text Cite

Rapid Near-Neighbor Interaction of High-dimensional Data via Hierarchical Clustering

Journal Article · September 11, 2017 Calculation of near-neighbor interactions among high dimensional, irregularly distributed data points is a fundamental task to many graph-based or kernel-based machine learning algorithms and applications. Such calculations, involving large, sparse interac ... Link to item Cite

RECFMM: Recursive Parallelization of the Adaptive Fast Multipole Method for Coulomb and Screened Coulomb Interactions

Journal Article Communications in Computational Physics · August 1, 2016 We present RECFMM, a program representation and implementation of a recursive scheme for parallelizing the adaptive fast multipole method (FMM) on shared-memory computers. It achieves remarkable high performance while maintaining mathematical clarity and f ... Full text Cite

SU-F-I-10: Spatially Local Statistics for Adaptive Image Filtering.

Conference Med Phys · June 2016 PURPOSE: To facilitate adaptive image filtering operations, addressing spatial variations in both noise and signal. Such issues are prevalent in cone-beam projections, where physical effects such as X-ray scattering result in spatially variant noise, viola ... Full text Link to item Cite

SU-F-J-138: An Extension of PCA-Based Respiratory Deformation Modeling Via Multi-Linear Decomposition.

Conference Med Phys · June 2016 PURPOSE: To address and lift the limited degree of freedom (DoF) of globally bilinear motion components such as those based on principal components analysis (PCA), for encoding and modeling volumetric deformation motion. METHODS: We provide a systematic ap ... Full text Link to item Cite

SynTiSe: A modified multi-regime MCMC approach for generation of wind power synthetic time series

Conference 9th Annual IEEE International Systems Conference, SysCon 2015 - Proceedings · June 2, 2015 The Markov Chain Monte Carlo (MCMC) method is widely used for generation of synthetic wind power and wind speed time series, but its application for time resolutions of less than an hour often fails to replicate the autocorrelation (ACF) and probability de ... Full text Cite

WE-D-303-06: Multi-Layer Spectral Analysis for Tensor Structure Encoding of 4D Deformation Field Data.

Conference Med Phys · June 2015 PURPOSE: Adaptive denoising and encoding of 4D deformation-vector-field (DVF) extracted from 4D planning CT, for modeling patient dominant motion features across coupled trajectory dimensions and respiratory phases. METHODS: We propose a multi-layer spectr ... Full text Link to item Cite

WE-AB-303-09: Rapid Projection Computations for On-Board Digital Tomosynthesis in Radiation Therapy.

Conference Med Phys · June 2015 PURPOSE: To facilitate fast and accurate iterative volumetric image reconstruction from limited-angle on-board projections. METHODS: Intrafraction motion hinders the clinical applicability of modern radiotherapy techniques, such as lung stereotactic body r ... Full text Link to item Cite

Parallel AFMPB solver with automatic surface meshing for calculation of molecular solvation free energy

Journal Article Computer Physics Communications · May 1, 2015 We present PAFMPB, an updated and parallel version of the AFMPB software package for fast calculation of molecular solvation-free energy. The new version has the following new features: (1) The adaptive fast multipole method and the boundary element method ... Full text Cite

SU-D-18A-02: Towards Real-Time On-Board Volumetric Image Reconstruction for Intrafraction Target Verification in Radiation Therapy.

Conference Med Phys · June 2014 PURPOSE: To expedite on-board volumetric image reconstruction from limited-angle kV-MV projections for intrafraction verification. METHODS: A limited-angle intrafraction verification (LIVE) system has recently been developed for real-time volumetric verifi ... Full text Link to item Cite

A cycle-accurate synthesizable MIPS simulator in Simulink

Conference ACM International Conference Proceeding Series · February 20, 2014 We introduce a novel methodology for creating a synthesizable, cycle-accurate simulator of the MIPS32 processor with concise, high-level programming expressions using Simulink and other matlab tools. The simulator, named SimuMIPS, is capable of running bin ... Full text Cite

Real-time urban traffic information extraction from GPS tracking of a bus fleet

Conference Proceedings of the 2013 IEEE Symposium on Computational Intelligence in Vehicles and Transportation Systems, CIVTS 2013 - 2013 IEEE Symposium Series on Computational Intelligence, SSCI 2013 · October 28, 2013 We present a novel system named Speed-O to estimate in real time the average speed of traffic on every section of urban roads in the city of Thessaloniki, Greece. Speed-O processes the telemetry data reported by the fleet of more than 600 public transporta ... Full text Cite

Big snapshot stitching with scarce overlap

Journal Article 2013 IEEE High Performance Extreme Computing Conference, HPEC 2013 · January 1, 2013 We address certain properties that arise in gigapixel-scale image stitching for snapshot images captured with a novel micro-camera array system, AWARE-2. This system features a greatly extended field of view and high optical resolution, offering unique sen ... Full text Cite

Mathematical and numerical aspects of the adaptive fast multipole Poisson-Boltzmann solver

Journal Article Communications in Computational Physics · January 1, 2013 This paper summarizes the mathematical and numerical theories and computational elements of the adaptive fast multipole Poisson-Boltzmann (AFMPB) solver. We introduce and discuss the following components in order: the Poisson-Boltzmann model, boundary inte ... Full text Cite

Parallel search of k-nearest neighbors with synchronous operations

Journal Article 2012 IEEE Conference on High Performance Extreme Computing, HPEC 2012 · December 1, 2012 We present a new study of parallel algorithms for locating k-nearest neighbors (kNN) of each single query in a high dimensional (feature) space on a many-core processor or accelerator that favors synchronous operations, such as on a graphics processing uni ... Full text Cite

Automatic parallel code generation for NuFFT data translation on multicores

Journal Article Journal of Circuits, Systems and Computers · April 1, 2012 The nonuniform FFT (NuFFT) is widely used in many applications. Focusing on the most time-consuming part of the NuFFT computation, the data translation step, in this paper, we develop an automatic parallel code generation tool for data translation targetin ... Full text Cite

A Fourier-series-based kernel-independent fast multipole method

Journal Article Journal of Computational Physics · January 1, 2011 We present in this paper a new kernel-independent fast multipole method (FMM), named as FKI-FMM, for pairwise particle interactions with translation-invariant kernel functions. FKI-FMM creates, using numerical techniques, sufficiently accurate and compress ... Full text Cite

Revision of FMM–Yukawa: An adaptive fast multipole method for screened Coulomb interactions

Journal Article Computer Physics Communications · December 1, 2010 FMM–YUKAWA is a mathematical software package primarily for rapid evaluation of the screened Coulomb interactions of N particles in three dimensional space. Since its release, we have revised and re-organized the data structure, software architecture, and ... Full text Cite

Scalable parallelization strategies to accelerate NuFFT data translation on multicores

Journal Article Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) · November 19, 2010 The non-uniform FFT (NuFFT) has been widely used in many applications. In this paper, we propose two new scalable parallelization strategies to accelerate the data translation step of the NuFFT on multicore machines. Both schemes employ geometric tiling an ... Full text Cite

A special-purpose compiler for look-up table and code generation for function evaluation

Journal Article Proceedings -Design, Automation and Test in Europe, DATE · June 9, 2010 Elementary functions are extensively used in computer graphics, signal and image processing, and communication systems. This paper presents a special-purpose compiler that automatically generates customized look-up tables and implementations for elementary ... Cite

Compressive video sensors using multichannel imagers.

Journal Article Applied optics · April 2010 We explore the possibilities of obtaining compression in video through modified sampling strategies using multichannel imaging systems. The redundancies in video streams are exploited through compressive sampling schemes to achieve low power and low comple ... Full text Open Access Cite

Exploring parallelization strategies for NUFFT data translation

Journal Article Embedded Systems Week 2009 - Proceedings of the 7th ACM International Conference on Embedded Software, EMSOFT '09 · December 24, 2009 This paper introduces parallelization strategies for the Non-Uniform FFT (NUFFT) data translation on multicore architectures. The NUFFT enables the use of the celebrated FFT with un-equally spaced data in numerous situations in signal and image processing ... Full text Cite

An automated framework for accelerating numerical algorithms on reconfigurable platforms using algorithmic/architectural optimization

Journal Article IEEE Transactions on Computers · December 1, 2009 This paper describes TANOR, an automated framework for designing hardware accelerators for numerical computation on reconfigurable platforms. Applications utilizing numerical algorithms on large-size data sets require high-throughput computation platforms. ... Full text Cite

Automated optimization of look-up table implementation for function evaluation on FPGAs

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · November 11, 2009 This paper presents a systematic approach for automatic generation of look-up-table (LUT) for function evaluations and minimization in hardware resource on field programmable gate arrays (FPGAs). The class of functions supported by this approach includes s ... Full text Cite

Fast computation of local correlation coefficients on graphics processing units

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · November 11, 2009 This paper presents an acceleration method, using both algorithmic and architectural means, for fast calculation of local correlation coefficients, which is a basic image-based information processing step for template or pattern matching, image registratio ... Full text Cite

Design and characterization of thin multiple aperture infrared cameras.

Journal Article Applied optics · April 2009 We describe a multiple-aperture long-wave infrared camera built on an uncooled microbolometer array with the objective of decreasing camera thickness. The 5 mm thick optical system is an f/1.2 design with a 6.15 mm effective focal length. An integrated ima ... Full text Cite

Video rate spectral imaging using a coded aperture snapshot spectral imager.

Journal Article Optics express · April 2009 We have previously reported on coded aperture snapshot spectral imagers (CASSI) that can capture a full frame spectral image in a snapshot. Here we describe the use of CASSI for spectral imaging of a dynamic scene at video rate. We describe significant adv ... Full text Cite

Fast computation of local correlation coefficients

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · December 18, 2008 This paper presents an acceleration method, using both algorithmic and architectural means, for fast calculation of local correlation coefficients , which is a basic image-based information processing step for template or pattern matching, image registrati ... Full text Cite

Spatio-temporal sampling for video

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · December 17, 2008 With this work we propose spatio-temporal sampling strategies for video using a lenslet array computational imaging system and explore the opportunities and challenges in the design of compressive video sensors and corresponding processing algorithms. The ... Full text Cite

Spectral image estimation for coded aperture snapshot spectral imagers

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · December 17, 2008 This paper describes numerical estimation techniques for coded aperture snapshot spectral imagers (CASSI). In a snapshot, a CASSI captures a two-dimensional (2D) array of measurements that is an encoded representation of both spectral information and 2D sp ... Full text Cite

Accelerating nonuniform fast Fourier transform via reduction in memory access latency

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · December 17, 2008 We address the discrepancy that existed between the low arithmetic complexity of nonuniform Fast Fourier Transform (NUFFT) algorithms and high latency in practical use of NUFFTs with large data sets, especially, in multi-dimensional domains. The execution ... Full text Cite

Solving non-negative linear inverse problems with the NeAREst method

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · December 17, 2008 This paper introduces the theoretical development of a numerical method, named NeAREst, for solving non-negative linear inverse problems, which arise often from physical or probabilistic models, especially, in image estimation with limited and indirect mea ... Full text Cite

Technical note: rapid prototyping of 3D grid arrays for image guided therapy quality assurance.

Journal Article Med Phys · December 2008 Three dimensional grid phantoms offer a number of advantages for measuring imaging related spatial inaccuracies for image guided surgery and radiotherapy. The authors examined the use of rapid prototyping technology for directly fabricating 3D grid phantom ... Full text Link to item Cite

Thin infrared imaging systems through multichannel sampling.

Journal Article Applied optics · April 2008 The size of infrared camera systems can be reduced by collecting low-resolution images in parallel with multiple narrow-aperture lenses rather than collecting a single high-resolution image with one wide-aperture lens. We describe an infrared imaging syste ... Full text Cite

Multichannel sampling schemes for optical imaging systems.

Journal Article Applied optics · April 2008 We introduce a framework of focal-plane coding schemes for multichannel sampling in optical systems. A particular objective is to develop an ultrathin imager without compromising image resolution. We present a complete f/2.1 optical system with a thickness ... Full text Cite

TANOR: A tool for accelerating N-body simulations on reconfigurable platform

Journal Article Proceedings - 2007 International Conference on Field Programmable Logic and Applications, FPL · December 1, 2007 Algorithm-architecture co-exploration is hindered by the lack of efficient tools. As a consequence, designers are currently able to explore only a limited set of points in the whole design space. There-fore, a tool that can allow fast exploration of algori ... Full text Cite

Efficient function evaluations with lookup tables for structured matrix operations

Journal Article IEEE Workshop on Signal Processing Systems, SiPS: Design and Implementation · December 1, 2007 A hardware efficient approach is introduced for elementary function evaluations in certain structured matrix computations. It is a comprehensive approach that utilizes lookup tables for compactness, employs interpolations with adders and multipliers for th ... Full text Cite

The MONTAGE least gradient image reconstruction

Journal Article Optics InfoBase Conference Papers · January 1, 2007 We introduce an image reconstruction algorithm for the Compressive Optical MONTAGE Photography Initiative, for recovering the resolution of an image from a set of aliased subimages acquired by a lenslet array optical system. © 2007 Optical Society of Ameri ... Cite

Compressive measurements for video

Journal Article Optics InfoBase Conference Papers · January 1, 2007 Redundancies present in video streams could be used to implement compressive sampling to achieve low power video sensors. We explore the possibilities of using this in the design of compressive video sensors and corresponding algorithms. © 2007 Optical Soc ... Cite

Depth of field with multi-aperture LWIR imagers

Journal Article Optics InfoBase Conference Papers · January 1, 2007 We use a multiaperture approach to design a thin LWIR camera. Having a shorter focal length, the microlens array provides an extended depth of field over the conventional system. © 2007 Optical Society of America. ... Cite

A rotated array clustered extended hypercube processor: The RACE-H™ processor

Chapter · January 1, 2007 Many products require efficient high-performance processing to meet the growing computational requirements of numerous media applications. Tailoring a processor’s architecture and system interfaces to minimize processing overhead and inefficiencies in data ... Cite

Compressive measurements for video

Conference Optics InfoBase Conference Papers · January 1, 2007 Redundancies present in video streams could be used to implement compressive sampling to achieve low power video sensors. We explore the possibilities of using this in the design of compressive video sensors and corresponding algorithms. © 2007 Optical Soc ... Full text Cite

The MONTAGE least gradient image reconstruction

Conference Optics InfoBase Conference Papers · January 1, 2007 We introduce an image reconstruction algorithm for the Compressive Optical MONTAGE Photography Initiative, for recovering the resolution of an image from a set of aliased subimages acquired by a lenslet array optical system. © 2007 Optical Society of Ameri ... Full text Cite

Depth of field with multi-aperture LWIR imagers

Conference Optics InfoBase Conference Papers · January 1, 2007 We use a multiaperture approach to design a thin LWIR camera. Having a shorter focal length, the microlens array provides an extended depth of field over the conventional system. © 2007 Optical Society of America. ... Full text Cite

Ultra-thin Multiple-channel LWIR Imaging Systems

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · November 6, 2006 Infrared camera systems may be made dramatically smaller by simultaneously collecting several low-resolution images with multiple narrow aperture lenses rather than collecting a single high-resolution image with one wide aperture lens. Conventional imaging ... Full text Cite

Compressive imaging sensors

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · September 18, 2006 This paper describes a compressive sensing strategy developed under the Compressive Optical MONTAGE Photography Initiative. Multiplex and multi-channel measurements are generally necessary for compressive sensing. In a compressive imaging system described ... Full text Cite

Multimodal multiplex Raman spectroscopy optimized for in vivo chemometrics

Journal Article Progress in Biomedical Optics and Imaging - Proceedings of SPIE · June 29, 2006 We have designed and constructed a multimodal multiplex Raman spectrometer which uses multi-wavelength excitation to better detect signals in the presence of fluorescence by taking advantage of the shift-variance of the Raman signal with respect to excitat ... Full text Cite

Integrated sensing and processing of Raman spectra for in vivo BAC measurement

Conference ALCOHOLISM-CLINICAL AND EXPERIMENTAL RESEARCH · June 1, 2006 Link to item Cite

Lightweight biometric detection system for human classification using pyroelectric infrared detectors.

Journal Article Applied optics · May 2006 We use pyroelectric detectors that are differential in nature to detect motion in humans by their heat emissions. Coded Fresnel lens arrays create boundaries that help to localize humans in space as well as to classify the nature of their motion. We design ... Full text Cite

Thin digital imaging systems using focal plane coding

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · April 17, 2006 With this work we show the use of focal plane coding to produce nondegenerate data between subapertures of an imaging system. Subaperture data is integrated to form a single high resolution image. Multiple apertures generate multiple copies of a scene on t ... Full text Cite

Nonadaptive group testing based fiber sensor deployment for multiperson tracking

Journal Article IEEE Sensors Journal · April 1, 2006 We demonstrate a novel use of nonadaptive group testing in the design and implementation of a fiber sensor floor web for the localization and tracking of multiple individuals. We validate our design with a floor web woven with optical fiber threads that fo ... Full text Cite

Ultra-thin multi-aperture LWIR imagers

Journal Article Optics InfoBase Conference Papers · January 1, 2006 We design and implement an ultra-thin LWIR camera by replacing the conventional lens system with a micro-lens array. The resulting low resolution images can be used to reconstruct a high resolution image by post processing. © 2006 Optical Society of Americ ... Cite

Ultra-thin multi-aperture LWIR imagers

Conference Optics InfoBase Conference Papers · January 1, 2006 We design and implement an ultra-thin LWIR camera by replacing the conventional lens system with a micro-lens array. The resulting low resolution images can be used to reconstruct a high resolution image by post processing. © 2006 Optical Society of Americ ... Full text Cite

Coded aperture Raman spectroscopy for quantitative measurements of ethanol in a tissue phantom

Journal Article Applied Spectroscopy · 2006 Coded aperture spectroscopy allows for sources of large etendue to be efficiently coupled into dispersive spectrometers by replacing the traditional input slit with a patterned mask. We describe a coded aperture spectrometer optimized for Raman spectroscop ... Full text Link to item Cite

Compressive sampling strategies for integrated microspectrometers

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · 2006 We consider compressive sensing in the context of optical spectroscopy. With compressive sensing, the ratio between the number of measurements and the number of estimated values is less than one, without compromising the fidelity in estimation. A compressi ... Full text Link to item Cite

Path-dependent human identification using a pyroelectric infrared sensor and fresnel lens arrays.

Journal Article Optics express · January 2006 This paper presents a design and development of a low power consumption, and low cost, human identification system using a pyroelectric infrared (PIR) sensor whose visibility is modulated by a Fresnel lens array. The optimal element number of the lens arra ... Full text Cite

Static two-dimensional aperture coding for multimodal, multiplex spectroscopy

Journal Article Applied Optics · 2006 We propose a new class of aperture-coded spectrometer that is optimized for the spectral characterization of diffuse sources. The instrument achieves high throughput and high spectral resolution by replacing the slit of conventional dispersive spectrometer ... Full text Link to item Cite

Geometric tiling for reducing power consumption in structured matrix operations

Journal Article 2006 IEEE International Systems-on-Chip Conference, SOC · January 1, 2006 This work focuses on reducing power consumption while maintaining the efficiency and accuracy of matrix computations using both algorithmic and architectural means. We transform the algorithms, in adaptation to application specifics, to translate the matri ... Full text Cite

Compressive optical montage photography

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · December 1, 2005 The Compressive Optical MONTAGE Photography Initiative (COMP-I) is an initiative under DARPA's MONTAGE program. The goals of COMP-I are to produce 1 mm thick visible imaging systems and 5 mm thick IR systems without compromising pixel-limited resolution. I ... Full text Cite

Sensor-layer image compression based on the quantized cosine transform

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · November 15, 2005 We introduce a novel approach for compressive coding at the sensor layer for an integrated imaging system. Compression at the physical layer reduces the measurements-to-pixels ratio and the data volume for storage and transmission, without confounding imag ... Full text Cite

Multimodal, multiplex, Raman spectroscopy of alcohol in diffuse, fluorescent media

Journal Article Optics InfoBase Conference Papers · January 1, 2005 Optical diagnostics in biological materials are hindered by fluorescence and scattering. We have developed a multimodal, multiplex, coded-aperture Raman spectrometer to detect alcohol in a lipid tissue phantom solution. ©2005 Optical Society of America. ... Cite

Compressive sampling for feature specific compact imagers

Journal Article Optics InfoBase Conference Papers · January 1, 2005 We investigate the use of estimation methods with multi-aperture imaging hardware that are noise robust and able to provide high resolution images from limited measurements. © 2005 Optical Society of America. ... Cite

Multi-aperture visible high resolution thin imager

Journal Article Optics InfoBase Conference Papers · January 1, 2005 We have designed and built a multi-aperture thin imager using a lenslet array and a CCD imager. The thickness of the imager is significantly reduced. We will present experimental results that demonstrate high resolution imaging. © 2005 Optical Society of A ... Cite

Multimodal, multiplex Raman spectrometer for weak, incoherent sources

Journal Article Optics InfoBase Conference Papers · January 1, 2005 Raman spectroscopy in bio-materials is complicated by fluorescence and scattering. We have developed a multimodal, multiplex spectrometer that overcomes these difficulties. We are currently constructing a second generation prototype for in-vivo Raman spect ... Cite

The quantized cosine transform for sensor-layer image compression

Journal Article Optics InfoBase Conference Papers · January 1, 2005 We introduce a compressive encoding at the sensor layer based on the quantized cosine transform. Compression at the physical layer of integrated imaging systems reduces the measurements-to-pixels ratio, the data volume and accelerates image estimation. © 2 ... Cite

The quantized cosine transform for sensor-layer image compression

Journal Article Optics InfoBase Conference Papers · January 1, 2005 We introduce a compressive encoding at the sensor layer based on the quantized cosine transform. Compression at the physical layer of integrated imaging systems reduces the measurements-to-pixels ratio, the data volume and accelerates image estimation. © 2 ... Cite

Multimodal, multiplex Raman spectrometer for weak, incoherent sources

Conference Optics InfoBase Conference Papers · January 1, 2005 Raman spectroscopy in bio-materials is complicated by fluorescence and scattering. We have developed a multimodal, multiplex spectrometer that overcomes these difficulties. We are currently constructing a second generation prototype for in-vivo Raman spect ... Full text Cite

Compressive sampling for feature specific compact imagers

Conference Optics InfoBase Conference Papers · January 1, 2005 We investigate the use of estimation methods with multi-aperture imaging hardware that are noise robust and able to provide high resolution images from limited measurements. © 2005 Optical Society of America. ... Full text Cite

Multi-aperture visible high resolution thin imager

Conference Optics InfoBase Conference Papers · January 1, 2005 We have designed and built a multi-aperture thin imager using a lenslet array and a CCD imager. The thickness of the imager is significantly reduced. We will present experimental results that demonstrate high resolution imaging. © 2005 Optical Society of A ... Full text Cite

The quantized cosine transform for sensor-layer image compression

Conference Optics InfoBase Conference Papers · January 1, 2005 We introduce a compressive encoding at the sensor layer based on the quantized cosine transform. Compression at the physical layer of integrated imaging systems reduces the measurements-to-pixels ratio, the data volume and accelerates image estimation. © 2 ... Full text Cite

Multimodal, multiplex, Raman spectroscopy of alcohol in diffuse, fluorescent media

Journal Article Progress in Biomedical Optics and Imaging - Proceedings of SPIE · 2005 Optical diagnostics in biological materials are hindered by fluorescence and scattering. We have developed a multimodal, multiplex, coded-aperture Raman spectrometer to detect alcohol in a lipid tissue phantom solution. © 2005 SPIE and OSA. ... Cite

Coded-aperture, multi-wavelength Raman spectroscopy for ethanol detection in biological samples

Conference Proceedings of the 8th Joint Conference on Information Sciences, Vols 1-3 · January 1, 2005 Link to item Cite

Reference structure tomography.

Journal Article Journal of the Optical Society of America. A, Optics, image science, and vision · July 2004 Reference structure tomography (RST) uses multidimensional modulations to encode mappings between radiating objects and measurements. RST may be used to image source-density distributions, estimate source parameters, or classify sources. The RST paradigm p ... Full text Cite

Fiber optical web for object localization by geometric space coding

Conference Optics InfoBase Conference Papers · January 1, 2004 A fiber web was used for object(s) localization. The fiber web used binary codes to segment and encode the object space. We employed 2D gray code to localize an extended object and superimposed code to localize multiple objects simultaneously. Experimental ... Cite

Coded apertures for efficient pyroelectric motion tracking.

Journal Article Optics express · September 2003 Coded apertures may be designed to modulate the visibility between source and measurement spaces such that the position of a source among N resolution cells may be discriminated using logarithm of N measurements. We use coded apertures as reference structu ... Full text Cite

Efficient motion sensing system using pyroelectric sensors

Conference Optics InfoBase Conference Papers · January 1, 2003 We describe a motion sensor system that can discriminate 'N' source states using logarithm of 'N' sensor measurements. Based on this design approach, we implement a motion sensing system using pyroelectric sensors as the sensing element and a reference str ... Cite

Indirect VLIW memory allocation for the ManArray multiprocessor DSP

Journal Article Comput. Archit. News (USA) · 2003 The indirect very long instruction word (iVLIW) architecture and its implementation on the BOPS ManAffay family of multiprocessor digital signal processors (DSP) provides a scalable alternative to the wide instruction busses usually required in a multiproc ... Full text Link to item Cite

A matrix version of the fast multipole method

Journal Article SIAM Review · January 1, 2001 We present a matrix interpretation of the three-dimensional fast multipole method (FMM). The FMM is for efficient computation of gravitational/electrostatic potentials and fields. It has found various applications and inspired the design of many efficient ... Full text Cite

ManArray processor interconnection network: An introduction

Conference Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) · January 1, 1999 The present paper introduces the new interconnection network of the BOPS ManArray family of available core products. To form a ManArray network, the processing elements are completely connected within clusters and communicate with members of only two other ... Full text Cite

High-performance FFT implementation on the BOPS ManArray parallel DSP

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · 1999 We present a high performance implementation of the FFT algorithm on the BOPS ManArray parallel DSP processor. The ManArray we consider for this application consists of an array controller and 2 to 4 fully interconnected processing elements. To expose the ... Full text Link to item Cite

Performance modeling of adaptive-optics imaging systems using fast Hankel transforms

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · December 1, 1998 Real-time adaptive-optics is a means for enhancing the resolution of ground based, optical telescopes beyond the limits previously imposed by the turbulent atmosphere. One approach for linear performance modeling of closed-loop adaptive-optics systems invo ... Full text Cite

Jacobi-like method for a control algorithm in adaptive-optics imaging

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · 1998 A study is made of a non-smooth optimization problem arising in adaptive-optics, which involves the real-time control of a deformable mirror designed to compensate for atmospheric turbulence and other dynamic image degradation factors. One formulation of t ... Full text Link to item Cite

Optimizing closed-loop adaptive-optics performance with use of multiple control bandwidths

Journal Article Journal of the Optical Society of America A: Optics and Image Science, and Vision · January 1, 1994 The performance of a closed-loop adaptive-optics system may in principle be improved by selection of distinct and independently optimized control bandwidths for separate components, or modes, of the wave-front- distortion profile. We describe a method for ... Full text Cite

Optimizing closed-loop adaptive optics performance using multiple control bandwidths

Journal Article Proceedings of SPIE - The International Society for Optical Engineering · 1994 The performance of a closed loop adaptive optics system may in principle be improved by selecting distinct and independently optimized control bandwidths for separate components, or modes, of the wave front distortion profile. In this paper we outline a me ... Full text Link to item Cite

APPROXIMATION WITH KRONECKER PRODUCTS

Conference LINEAR ALGEBRA FOR LARGE SCALE AND REAL-TIME APPLICATIONS · January 1, 1993 Link to item Cite

Deterministic one-dimensional cellular automata

Journal Article Journal of Statistical Physics · July 1, 1989 A formal treatment of some of the properties of deterministic, rule 150, elementary one-dimensional cellular automata (CA) with null boundary conditions is presented. The general form of the characteristic polynomial of the CA global rule transition matrix ... Full text Cite

Information dimension in fractal structures.

Journal Article Physical review. B, Condensed matter · April 1989 Full text Cite