Historical review of OCR research and development

Article Abstract:

The research and development of optical character recognition (OCR) systems is examined, as well as the historical development of commercial OCRs. OCR research and development is divided into template matching and structure analysis approaches, which are coming closer together. Commercial products can be classified into three generations: first-generation OCRs, which are those appearing in the 1960's that were characterized by the constrained letter shapes that the OCR's read; second-generation systems, which are characterized by hand-printed character recognition capabilities; and third-generation systems, which include print-quality proofreaders, hand-printed document readers and Kanji recognition machines.

Systems analysis, Industrial research, Image processing, Optical character readers, Computer history, Research and Development, System Design, History of Computing

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Imaging radar polarimetry: a review

Article Abstract:

Recent advances in imaging radar technology are examined with regard to the technology's hardware and algorithms. The advances have led to imaging radar polarimeters, or radars that use antenna synthesis techniques to image the Earth's surface at any possible polarization, which enables the complete measurement of a target's polarization properties and permits a better understanding of the electromagnetic scattering process. Imaging radar polarimetry is reviewed in detail, as are ground signal processing and calibration peculiar to the polarimetric signals.

Product introduction, Imaging systems, Radar, Radar Systems, New Technique, Antennas, Imaging Technology

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