The synthesis of complex spatial filters for coherent optical data processing

摘要

The key elements in coherent optical processors are the spatial filters. To realize the full potential of coherent processors much work should be devoted to the synthesis of and the production techniques for them. In this paper, some recent work on filters synthesis will be summarized, and the implications in optical computation, image processing (enhancement), image restoration (deblurring) and image detection examined. In addition, some advances on the production techniques for the spatial filters will be briefly reviewed. This would include the extension of Vander Lugt's filters to the multiply-exposed filters, the binary filters, the phase only filters, and the introduction of nonlinear filters.