A microcomputer-based programmable optical correlator (MPOC) is proposed for automatic pattern recognition and identification. A programmable magneto-optic spatial light modulator and a liquid-crystal light value are used to perform a real-time joint-transform correlation operation. Since the proposed MPOC consists of a microcomputer and an optical processing system, it has the advantage of real-time programmable processing capability for large space-bandwidth-product information. The basic theory and a feasibility study of the technique are given.

Microcomputer-based programmable optical correlator for automatic pattern recognition and identification.

A new technique of real-time binary image subtraction is demonstrated as an application of XOR optical logic. Based on the modulation of polarization, two electrooptical devices are arranged in tandem to perform XOR and XNOR optical logic operations. Experimental results of binary image subtraction using two liquid crystal TVs are presented.

Real-time liquid crystal TV XOR- and XNOR-gate binary image subtraction technique.

Faraday and Kerr rotations are magnetooptical (MO) effects used for rotating the polarization of light in transmission and reflection from a magnetized medium, respectively. MO effects combined with intrinsically fast magnetization reversal, which can go down to a few tens of femtoseconds or less, can be applied in magnetooptical spatial light modulators (MOSLMs) promising for nonvolatile, ultrafast, and high-resolution spatial modulation of light. With the recent progress in low-power switching of magnetic and MO materials, MOSLMs may lead to major breakthroughs and benefit beyond state-of-the-art holography, data storage, optical communications, heads-up displays, virtual and augmented reality devices, and solid-state light detection and ranging (LIDAR). In this study, the recent developments in the growth, processing, and engineering of advanced materials with high MO figures of merit for practical MOSLM devices are reviewed. The challenges with MOSLM functionalities including the intrinsic weakness of MO effect and large power requirement for switching are assessed. The suggested solutions are evaluated, different driving systems are investigated, and resulting device architectures are benchmarked. Finally, the research opportunities on MOSLMs for achieving integrated, high-contrast, and low-power devices are presented.

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Advanced Materials and Device Architectures for Magnetooptical Spatial Light Modulators

The manuscript describes the development, implementation, and evaluation of a computer- assisted instructional (CAI) program to facilitate learning in an advanced pharmacotherapy course taught to Doctor of Pharmacy students. The target disease states for this pilot program were peptic ulcer disease (PUD) and gastroesophageal reflux disease (GERD). Objectives included: (i) developing a CAI program for the therapeutic management and pathophysiology of PUD and GERD; and (ii) determining the acceptance of the PUD/GERD CAI program as a method of teaching pharmacotherapeutic principles. All University of Georgia Pharm. D. students enrolled in the Fall 1995 Advanced Pharmacotherapeutics course were invited to use the CAI program after four hours of PUD/GERD lectures. Students completed a survey upon completion of the PUD/GERD CAI program. This survey evaluated students’ acceptance and perceptions of the effectiveness of the PUD/GERD CAI software as an instructional instrument. Results indicated that students (n=40; 100 percent of the class) perceived that the PUD/GERD CAI program was a valuable learning experience (4.20 ± 0.60; Likert scale: 1 = “strongly disagree” to 5 = “strongly agree”) and felt it enhanced patient-problem solving skills (3.96 ± 0.87). In addition, students expressed the desire to use CAI programs for other pharmacotherapeutics topics (4.45± 0.63). Although students enjoyed using the PUD/GERD CAI program (4.28 ± 0.65), they disagreed with the statement that the CAI program should be used in place of traditional pharmacotherapeutics lectures (1.75 ± 0.70) and favorably indicated that it should be used as a supplement to lectures (4.55 ± 0.67, P<0.01). Computer-assisted teaching in combination with traditional pharmacotherapeutics lectures is valuable in the instruction of pharmacotherapeutics.

Development and Evaluation of a Computer-Assisted Instructional Program in an Advanced Pharmacotherapeutics Course.

Novel electron trapping materials are inherently capable of performing subtraction over a wide dynamic range. The application of the electron trapping materials to parallel incoherent image subtraction is described in detail, and experimental results are presented.

Use of electron-trapping materials in optical signal processing. IV: Parallel incoherent image subtraction.

The application of a programmable magnetooptic spatial light modulator to white-light optical signal processing is presented. We have shown that the magnetooptic device responds to the polarized white light, in which a wide range of color object patterns can be generated. Since the magnetooptic device is a transmitted type spatial light modulator, it is very suitable for real-time programmable spatial filter synthesis and object pattern generation for optical signal processings. Experimental demonstrations of some of the elementary spatial filter syntheses and pseudocolor encodings are provided.

Application of a magnetooptic spatial light modulator to white-light optical processing

A hybrid optical architecture for digital matrix-matrix multiplication is discussed. The proposed system requires less hardware than outer-product optical matrix multipliers and offers a higher processing speed than systolic array matrix multipliers. The throughput and hardware requirements of the proposed architecture are discussed with reference to the availability of various electro-optic devices. The performance of the proposed system is compared to existing systolic array optical matrix multipliers and to outer-product-based optical matrix processors. The accuracy and error rate of the proposed architecture are evaluated.

Digital Optical Matrix Multiplication Based On A Systolic Outer-Product Method

In an effort to combine the advantages of optical information processing and the flexibility of digital computers, a real-time image subtraction system has been developed. A microcomputer is employed to control a Litton magnetooptic device (MOD) and also to interface the MOD to a video camera. The performance of the system in image subtraction is discussed in detail. An experimental demonstration of image subtraction is shown.

Real-time programmable image subtractor using a magnetooptic device.

A microcomputer-based real-time programmable optical signal processing system utilizing a magneto-optic spatial light modulator (MOSLM) and a liquid crystal light valve (LCLV) is described. This system can perform a myriad of complicated optical operations, such as image correlation, image subtraction, and matrix multiplication. Its important asserts are its programmability and the capability of real-time addressing. These are important for telerobotic vision in space automation applications. Design specifications and suggestions for practical implementation of the system are discussed. Some preliminary experimental demonstrations are conducted to demonstrate applications of the proposed system to image correlation for optical pattern recognition, image subtraction for lC chip inspection, and matrix multiplication for optical computing.

Microcomputer-based programmable optical signal processor

A microcomputer-based optical linear transformation processing system is proposed. The technique utilizes a systolic array processing method to perform various types of linear transformations, such as discrete Fourier transformation, discrete Hilbert transformation, discrete chirp-Z transformation and many others. By partially parallel addressing two magneto-optic spatial light modulators (MOSLM), this proposed system would offer high speed and parallel processing capability of optics and programmabilty of microcomputer.

Miaofu Cao

Papers

Application of a magnetooptic spatial light modulator to white-light optical processing

Digital Optical Matrix Multiplication Based On A Systolic Outer-Product Method

Real-time programmable image subtractor using a magnetooptic device.

Microcomputer-based programmable optical signal processor

A Hybrid Optical System For Linear Transformation Processing