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Attribute Invariant Spatial and Spatio-Temporal Correlators- [electronic resource]
Attribute Invariant Spatial and Spatio-Temporal Correlators - [electronic resource] / Monj...
Attribute Invariant Spatial and Spatio-Temporal Correlators- [electronic resource]

상세정보

자료유형  
 학위논문(국외)
자관 청구기호  
기본표목-개인명  
표제와 책임표시사항  
Attribute Invariant Spatial and Spatio-Temporal Correlators - [electronic resource] / Monjur, Mehjabin Sultana.
발행, 배포, 간사 사항  
[Sl] : Northwestern University , 2016
    형태사항  
    1 online resource(188 p)
    일반주기  
    Source: Dissertation Abstracts International, Volume: 78-05(E), Section: B.
    일반주기  
    Adviser: Selim M. Shahriar.
    학위논문주기  
    Thesis (Ph.D.)--Northwestern University, 2016.
    요약 등 주기  
    요약Target identification and tracking is important in many defense and civilian applications. Optical correlators provide a simple technique for fast verification and identification of data. The primary limitation of such Conventional Holographic Correlators (CHC) is the poor nature of the material used for recording. We develop the concept and design of, and demonstrate experimentally, a Hybrid Opto-electronic Correlator (HOC) using only photo-detectors, Spatial Light Modulator (SLM) and VLSI chips that overcomes the material problems of the CHC. In the HOC, the amplitude and phase information of the query as well as the reference image is recorded with photo-detectors via interference with plane waves. The output of such an HOC has four terms: two convolution signals and two cross-correlation signals. We show through simulation and experimental results, that the correlation signal depends non-trivially on both the relative and the absolute phases of these two plane waves at the planes of interference. We also demonstrate experimentally, a functional HOC for identical and different reference and query images under optimized phase conditions. We develop a technique for controlling and optimizing the output signal, such that the convolution terms can be eliminated, by using a single servo, aided by repeated calibrations with known objects and reference images, interlaced with the actual correlator operation. In addition, To achieve the ultimate speed of such a correlator, we also propose an integrated graphic processing unit which would perform all the electrical processes in a parallel manner. We also show that the HOC is capable of detecting objects in a scale and rotation invariant manner, along with the shift invariance feature, by incorporating Polar Mellin Transform (PMT). Furthermore, we demonstrate how to carry out shift, rotation and scale invariant detection of multiple matching objects simultaneously, a process previously thought to be incompatible with the PMT based correlators.
    요약 등 주기  
    요약We also develop the concept and design of an Automatic Event Recognition (AER) System based on a three-dimensional Spatio-Temporal Correlator (STC), that combines the techniques of holographic correlation and photon echo based temporal pattern recognition to match a video-clip contained in a video file, using atoms stored in a porous-glass material. By employing the nonlinear properties of inhomogenous broadened atomic media we show that it is possible to realize an AER system that can recognize rapidly the occurrence of events, the number of events, and the occurrence times. To model the response of such a system, one requires solving the Schrodinger Equation (SE), which is a computationally extensive task. We develop an analytical model to find the response of the STC and show that the analytical model agrees closely with the results obtained via explicit numerical simulation, but at a speed that is many orders of magnitude faster than the numerical model. We also show how such a practical AER system can be realized using a combination of a porous-glass based Rb vapor cell, a holographic video disc, and a lithium niobate crystal.
    주제명부출표목-일반주제명  
    주제명부출표목-일반주제명  
    부출표목-단체명  
    Northwestern University Electrical Engineering
      기본자료저록  
      Dissertation Abstracts International. 78-05B(E).
      기본자료저록  
      Dissertation Abstract International
      전자적 위치 및 접속  
       원문정보보기
      소장사항  
      20170404 2017

      MARC

       008170601s2016        us          esm        001c    eng
      ■001MOKWON01254225
      ■00520170418120235
      ■007cr
      ■020    ▼a9781369447903
      ■035    ▼a(MiAaPQ)AAI10193893
      ■040    ▼aMiAaPQ▼cMiAaPQ
      ■090    ▼a전자도서(박사논문)
      ■1001  ▼aMonjur,  Mehjabin  Sultana.
      ■24510▼aAttribute  Invariant  Spatial  and  Spatio-Temporal  Correlators▼h[electronic  resource]▼cMonjur,  Mehjabin  Sultana.
      ■260    ▼a[Sl]▼bNorthwestern  University▼c2016
      ■300    ▼a1  online  resource(188  p)
      ■500    ▼aSource:  Dissertation  Abstracts  International,  Volume:  78-05(E),  Section:  B.
      ■500    ▼aAdviser:  Selim  M.  Shahriar.
      ■5021  ▼aThesis  (Ph.D.)--Northwestern  University,  2016.
      ■520    ▼aTarget  identification  and  tracking  is  important  in  many  defense  and  civilian  applications.  Optical  correlators  provide  a  simple  technique  for  fast  verification  and  identification  of  data.  The  primary  limitation  of  such  Conventional  Holographic  Correlators  (CHC)  is  the  poor  nature  of  the  material  used  for  recording.  We  develop  the  concept  and  design  of,  and  demonstrate  experimentally,  a  Hybrid  Opto-electronic  Correlator  (HOC)  using  only  photo-detectors,  Spatial  Light  Modulator  (SLM)  and  VLSI  chips  that  overcomes  the  material  problems  of  the  CHC.  In  the  HOC,  the  amplitude  and  phase  information  of  the  query  as  well  as  the  reference  image  is  recorded  with  photo-detectors  via  interference  with  plane  waves.  The  output  of  such  an  HOC  has  four  terms:  two  convolution  signals  and  two  cross-correlation  signals.  We  show  through  simulation  and  experimental  results,  that  the  correlation  signal  depends  non-trivially  on  both  the    relative  and  the  absolute  phases  of  these  two  plane  waves  at  the  planes  of  interference.  We  also  demonstrate  experimentally,  a  functional  HOC  for  identical  and  different  reference  and  query  images  under  optimized  phase  conditions.  We  develop  a  technique  for  controlling  and  optimizing  the  output  signal,  such  that  the  convolution  terms  can  be  eliminated,  by  using  a  single  servo,  aided  by  repeated  calibrations  with  known  objects  and  reference  images,  interlaced  with  the  actual  correlator  operation.  In  addition,  To  achieve  the  ultimate  speed  of  such  a  correlator,  we  also  propose  an  integrated  graphic  processing  unit  which  would  perform  all  the  electrical  processes  in  a  parallel  manner.  We  also  show  that  the  HOC  is  capable  of  detecting  objects  in  a  scale  and  rotation  invariant  manner,  along  with  the  shift  invariance  feature,  by  incorporating  Polar  Mellin  Transform  (PMT).  Furthermore,  we  demonstrate  how  to  carry  out  shift,  rotation  and  scale  invariant  detection  of  multiple  matching  objects  simultaneously,  a  process  previously  thought  to  be  incompatible  with  the  PMT  based  correlators.
      ■520    ▼aWe  also  develop  the  concept  and  design  of  an  Automatic  Event  Recognition  (AER)  System  based  on  a  three-dimensional  Spatio-Temporal  Correlator  (STC),  that  combines  the  techniques  of  holographic  correlation  and  photon  echo  based  temporal  pattern  recognition  to  match  a  video-clip  contained  in  a  video  file,  using  atoms  stored  in  a  porous-glass  material.  By  employing  the  nonlinear  properties  of  inhomogenous  broadened  atomic  media  we  show  that  it  is  possible  to  realize  an  AER  system  that  can  recognize  rapidly  the  occurrence  of  events,  the  number  of  events,  and  the  occurrence  times.  To  model  the  response  of  such  a  system,  one  requires  solving  the  Schrodinger  Equation  (SE),  which  is  a  computationally  extensive  task.  We  develop  an  analytical  model  to  find  the  response  of  the  STC  and  show  that  the  analytical  model  agrees  closely  with  the  results  obtained  via  explicit  numerical  simulation,  but  at  a  speed  that  is  many  orders  of  magnitude  faster  than  the  numerical  model.  We  also  show  how  such  a  practical  AER  system  can  be  realized  using  a  combination  of  a  porous-glass  based  Rb  vapor  cell,  a  holographic  video  disc,  and  a  lithium  niobate  crystal.
      ■590    ▼aSchool  code:  0163.
      ■650  4▼aElectrical  engineering
      ■650  4▼aOptics
      ■690    ▼a0544
      ■690    ▼a0752
      ■71020▼aNorthwestern  University▼bElectrical  Engineering.
      ■7730  ▼tDissertation  Abstracts  International▼g78-05B(E).
      ■773    ▼tDissertation  Abstract  International
      ■790    ▼a0163
      ■791    ▼aPh.D.
      ■792    ▼a2016
      ■793    ▼aEnglish
      ■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T14489976▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
      ■980    ▼a20170404▼f2017

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