Salt-and-pepper Noise on:
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Salt-and-pepper noise, also known as impulse noise, is a form of noise sometimes seen on
Salt-and-pepper noise, also known as impulse noise, is a form of noise sometimes seen on digital image
A digital image is an image composed of picture elements, also known as ''pixels'', each with ''finite'', '' discrete quantities'' of numeric representation for its intensity or gray level that is an output from its two-dimensional functions ...
s. This noise can be caused by sharp and sudden disturbances in the image signal. It presents itself as sparsely occurring white and black pixels.
An effective noise reduction
Noise reduction is the process of removing noise from a signal. Noise reduction techniques exist for audio and images. Noise reduction algorithms may distort the signal to some degree. Noise rejection is the ability of a circuit to isolate an und ...
method for this type of noise is a median filter or a morphological filter. For reducing either salt noise or pepper noise, but not both, a contraharmonic mean filter can be effective.
See also
* Defective pixelReferences
Noise (graphics) Digital photography Image noise reduction techniques {{Photo-stub