Abstract
Imaging has always been the primary goal of informational optics. The whole history of optics is, without any exaggeration, a history of creating and perfecting imaging devices. Starting more than 2000 years ago from ancient magnifying glasses, optics has been evolving with ever increasing speed from Galileo's telescope and van Leeuwenhoek's microscope, through mastering new types of radiations and sensors, to the modern wide variety of imaging methods and devices of which most significant are holography, methods of computed tomography, adaptive optics, synthetic aperture and coded aperture imaging, and digital holography. The main characteristic feature of this latest stage of the evolution of optics is integration of physical optics with digital computers. With this, informational optics is reaching its maturity. It is becoming digital and imaging is becoming computational.
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