Computational complexity is the minimum price in terms of resources required to obtain the result using a given algorithm for a problem of a given size. Electronic computers can pay the price in terms of time or space...
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ISBN:
(纸本)0819441856
Computational complexity is the minimum price in terms of resources required to obtain the result using a given algorithm for a problem of a given size. Electronic computers can pay the price in terms of time or space - through concurrency methods such as parallel or pipelined processors. optical computers allow the use of a third resource - fanin. By using space and fanin, optical processors can perform some tasks at a speed independent of the size of the input. Examples from conventional algorithmic processes and somewhat less familiar nonalgorithmic processes are provided as illustration.
Fluorescent images of gallbladder stones, tissue and bile are obtained using a streak camera. A Match Spatial Filer (MSF) is made using a stone fluorescent image. The MSF is used to perform correlations with fluoresce...
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ISBN:
(纸本)0819441856
Fluorescent images of gallbladder stones, tissue and bile are obtained using a streak camera. A Match Spatial Filer (MSF) is made using a stone fluorescent image. The MSF is used to perform correlations with fluorescent tissue and bile image. A method for recognition of the stone and rejection of the tissue during the laser lithotripsy is proposed using the correlation outputs.
Spatial light Modulators (SLM) are key devices for the development of opticalinformation processors. Low cost twisted nematic liquid crystal (TN-LC) SLM's are widely available and their characteristics have been ...
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ISBN:
(纸本)0819441236
Spatial light Modulators (SLM) are key devices for the development of opticalinformation processors. Low cost twisted nematic liquid crystal (TN-LC) SLM's are widely available and their characteristics have been extensively studied. Beside the fact that they exhibit a coupled amplitude and phase modulation, their speed is limited to approximately the video frame rate. An alternative to TN-LC devices can be the use of analog ferroelectric liquid crystal (FLC) devices. These devices now commercially available produce a gray level pure amplitude modulation at typical frame rates of I kHz. In order to determine its coding capabilities and its limitations, the characterization of such a device, manufactured by Boulder Nonlinear systems Inc., is presented in this paper. This SLM has a resolution of 512 by 512 pixels with a pitch of 15 Pm and has a reflective VLSI backplane. The study of its potential applications for the display of dynamic diffractive optical elements and also as a component of an optical processor for pattern recognition will be followed by experimental results and comparisons with TN-LC devices.
We propose a method of synthesizing computer-generated holograms of real-life three-dimensional (3-D) objects. An ordinary digital camera illuminated by incoherent white light records several projections of the 3-D ob...
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ISBN:
(纸本)0819441856
We propose a method of synthesizing computer-generated holograms of real-life three-dimensional (3-D) objects. An ordinary digital camera illuminated by incoherent white light records several projections of the 3-D object from different points of view. The recorded data are numerically processed to yield a two-dimensional complex function, which is then encoded as a computer-generated hologram. When this hologram is illuminated by a plane wave, a 3-D real image of the object is reconstructed.
The proceedings contains 26 papers from the conference on Photonic devices and algorithms for Computing III. Topics discussed include: legacy of opticalinformationprocessing;planar-waveguide-type optical switching d...
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The proceedings contains 26 papers from the conference on Photonic devices and algorithms for Computing III. Topics discussed include: legacy of opticalinformationprocessing;planar-waveguide-type optical switching devices;optoelectronic techniques for real-time pattern recognition;strange attractor in optical logic cells and training an associative memory model for character recognition.
The advances in the design and fabrication of microlaser arrays, photodetectors and free-space optical interconnection elements have driven the creation of ever more "real world" demonstrator systems. In thi...
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ISBN:
(纸本)0819441694
The advances in the design and fabrication of microlaser arrays, photodetectors and free-space optical interconnection elements have driven the creation of ever more "real world" demonstrator systems. In this paper we review the progress made to date on two separate demonstrator projects which have been assembled at Heriot-Watt University. We shall describe some of the enabling technologies used in the creation of these systems and outline the potential for scaling the architectures described up to sizes where the computational advantages of the optics-in-computing paradigm become highly attractive.
The advances in the design and fabrication of microlaser arrays, photodetectors and free-space optical interconnection elements have driven the creation of ever more "real world" demonstrator systems. In thi...
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ISBN:
(纸本)0819441236
The advances in the design and fabrication of microlaser arrays, photodetectors and free-space optical interconnection elements have driven the creation of ever more "real world" demonstrator systems. In this paper we review the progress made to date on two separate demonstrator projects which have been assembled at Heriot-Watt University. We shall describe some of the enabling technologies used in the creation of these systems and outline the potential for scaling the architectures described up to sizes where the computational advantages of the optics-in-computing paradigm become highly attractive.
The proceedings contains 36 papers from the conference on algorithms and systems for optical information processing V. The topics discussed include: all-optical three-dimensional object recognition with volume hologra...
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The proceedings contains 36 papers from the conference on algorithms and systems for optical information processing V. The topics discussed include: all-optical three-dimensional object recognition with volume holography;computer-generated holograms of three-dimensional real objects;correlation of the gallbladder stone and tissue fluorescent images;geometry of decision boundaries of neural networks and time evolution of frequency components in a chaotic digital signal.
optical correlators using spatial light modulators in the filter plane have been discussed and presented for many years. In most cases, these devices are electrically addressed modulators and the filters are generated...
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ISBN:
(纸本)0819441856
optical correlators using spatial light modulators in the filter plane have been discussed and presented for many years. In most cases, these devices are electrically addressed modulators and the filters are generated off-line in software. These filters can be tailored to fit the desired application but cannot be adjusted to account for real-time changes in the target appearance. In addition, building filters to account for all of the possible viewing configurations can strain the reference database and the memory storage capability of the system. Recently, a correlator architecture that used an optically addressed, multiple quantum well (MQW) spatial light modulator as the filter plane device was presented. The architecture is a modified Vander Lugt correlator with and additional input modulator. The filter formed by the interference of the reference image beam and the reference beam is recorded on the MQW spatial light modulator. The recorded filter retains the full complex information as high-resolution film did years ago. Additionally, the filter can be updated simply by changing the pattern on the reference input modulator. The second input modulator is used to address this stored filter in - a normal correlator read-out configuration. The correlator has been completed and results will be presented as part of this paper.
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