Salt-and-pepper noise

From Wikipedia, the free encyclopedia
An image with salt-and-pepper noise

Salt-and-pepper noise, also known as impulse noise, is a form of noise sometimes seen on digital images. 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 method for this type of noise is a median filter[1] or a morphological filter.[2] For reducing either salt noise or pepper noise, but not both, a contraharmonic mean filter can be effective.[3]

See also[edit]


  1. ^ Jayaraman; et al. (2009). Digital Image Processing. Tata McGraw-Hill Education. p. 272. ISBN 9781259081439.
  2. ^ Rosin, Paul; Collomosse, John (2012). Image and Video-Based Artistic Stylisation. Springer Publishing. p. 92. ISBN 9781447145196.
  3. ^ Marques, Oge (2011). Practical Image and Video Processing Using MATLAB. Wiley. pp. 275–76. ISBN 9781118093481.