In image procesing, smoothing an image removes some of the fine detail. This may be used to remove noise or to look at different levels of detail, notably in a Laplacian-of-Gaussian filter. Smoothing filters may be a very simply averaging of an NxN area of pixels, or more complex such as applying a Gaussian filter.
Used in Chap. 7: page 102; Chap. 9: page 134; Chap. 12: pages 177, 178, 179, 185, 196, 202; Chap. 14: page 231
Also known as smoothing filter, smoothing function
Applying a 2 x 2 smoothing filter