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  Spatial filtering

Spatial filtering is an image processing tool used to enhance the appearance of an image. In Nuclear Medicine for example, images have a grainy appearance because of the statistical nature of the acquisition. A type of spatial filtering called smoothing can be used to reduce this effect, although it does adversely affect the spatial resolution of the image.
Mathematically a filter is a matrix which is applied to all pixels in the image using an operation known as convolution. It ...
 
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