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Much of digital signal processing today is geared toward image processing. People want to see pictures. Digital pictures can reveal much greater detail than the old analog pictures offered. It is important to recognize that the difference between digital and analog pictures is not just cosmetic. The transition to digital imagery is comparable to the transition provided by the introduction of the magnifying glass or the microscope or the telescope. A person could see the moon before, but when Galileo saw the moon through a telescope, it was a different moon. Geophysicists could create pictures of the underground strata with analog records, but now they can create digital pictures of such quality that a whole new world is opened up.