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Noise Types

This interactive tutorial illustrates the effects of various types of noise which may be superimposed on images. In some examples below, the amount of speckle noise has been increased to relatively high levels to make it readily visible, but operating a camera at high gain (e.g., dim light) can produce this amount. Likewise the amount of shot noise can be made very high and most cameras would be rejected by the manufacturer if there were more than a few defective pixels of this type, but some kinds of microscopy can produce “dropouts” which are the same as shot noise, and dust on negatives also produces the same effects.

The tutorial initializes with a randomly selected specimen appearing in the Specimen Image window. The Choose A Specimen pull-down menu provides a selection of specimen images, in addition to the initial randomly chosen one. The radio buttons select different types of noise, which may arise from various causes.

Contributing Authors

John C. Russ - Materials Science and Engineering Dept., North Carolina State University, Raleigh, North Carolina, 27695.

Matthew Parry-Hill, and Michael W. Davidson - National High Magnetic Field Laboratory, 1800 East Paul Dirac Dr., The Florida State University, Tallahassee, Florida, 32310.


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