The project "Optical Information Processing: Selected Methods and their Implementation" concentrated on selected areas of the field of Optical Information Processing [1-3]. Recently, not much attention has been devoted to this field, although it is very progressive. The aim was to create both theoretical and experimental background for future optical information processing experiments. Moreover, the project helped to create and prepare new laboratory tasks for students [4]. The research was directed both to the theoretical and experimental study. In the theoretical part, first, thorough background research of methods and approaches has been performed [3]. Then, physical models have been constructed, and computer simulations in order to predict the experimental results were performed [3]. In the experimental part, the experimental setup for Fourier optics and optical information processing has been developed, using the experience and equipment of the Laboratory of holography and diffractive optics at the Department of physical electronics, namely the spatial light modulator (SLM) and CCD detector. As a SLM, the Central Research Laboratories liquid crystal light amplitude modulator with the SVGA resolution and 4 gray levels was used, as a detector the ELECTRIM HR-1000 CCD/Olympus digital camera were applied.

Two types of filters have been investigated: Vander Lugt (VdL) and Joint transform correlator (JTC). Computer modeling was performed for both types of filters, both in the continuous and more realistic digital form. Advantages and disadvantages of both types were determined, founding JTC more practical and advantageous, and practical dependencies of magnitude of correlation peeks with respect to scale, position and rotation of the input object were determined. Finally, both types of filters were experimentally realized. The future goals are to perform an optical pattern/character recognition task using matched filtering process. Based on the results and experience gained during the solution of the project in 1999, there will be an effort to prepare more complex projects, also with an international cooperation.

References

[2] Yu,F.T. - Jutamulia,S.: Optical Processing, Computing, and Neural Networks John Wiley & Sons, Inc., New York, 1992.

[3] Baše,R. - Richter,I. - Fiala,P.: Design and realization of Fourier processor and selected problems of optical processing Fourth-year student research work, Dept. Physical Electronics, FNSPE CTU in Prague, 1999.

[4] Richter,I. - Fiala,P. - Baše,R. - Najdek,D.: Fourier optics new laboratory task for Optical and Optoelectronical Labs, Dept. Physical Electronics, FNSPE CTU in Prague, 1999.

This research has been conducted as part of research project No. 309 909 604.

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