BUILT-IN MATHEMATICA SYMBOL

# EntropyFilter

EntropyFilter[image, r]
filters image by replacing every value by the information entropy of the values in its range r neighborhood.

EntropyFilter[data, r]
applies entropy filtering to an array of data.

## DetailsDetails

• EntropyFilter[image, r] computes the information entropy of the values in blocks centered on each pixel.
• Given a set of values , the information entropy is taken to be .
• For multichannel images, EntropyFilter computes the local entropy of the set of pixel vectors.
• At the edges of an image, EntropyFilter uses smaller neighborhoods.
• EntropyFilter works with 3D as well as 2D images, and also with data arrays of any rank.
• EntropyFilter[image, {rrow, rcol}] uses range in height, and in width.
• EntropyFilter[image, {rslice, rrow, rcol}] uses range in height, in depth, and in width.

## ExamplesExamplesopen allclose all

### Basic Examples (3)Basic Examples (3)

Entropy filtering of random disks:

Apply entropy filtering to show areas of higher information content with higher intensities:

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Apply an entropy filter to a vector of numbers:

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