MaxDetect

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`MaxDetect`

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MaxDetect[image]

gives a binary image in which white pixels correspond to constant extended maxima in image.

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MaxDetect[image,h]

finds extended maxima where the range of values is not greater than h.

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MaxDetect[data,…]

applies maxima detection to an array of data.

Details and Options

MaxDetect[image] finds regional maxima.
An extended maximum is a connected set of pixels with values greater than their surroundings.
MaxDetect[image,h] effectively chops maxima of height h or less and returns all remaining constant regional maxima.
MaxDetect[image] is equivalent to MaxDetect[image,0].
MaxDetect works with binary, grayscale, and other images.
MaxDetect works with 3D as well as 2D images, and also with data arrays of any rank.
The following options can be given:
CornerNeighbors True whether to include corner neighbors

Padding Automatic padding method to use
By default, for images black padding is used, and for data arrays, the minimum possible number is used so that the maxima at the boundary is always detected regardless of the range of data values.

Examples

open allclose all

Basic Examples (3)Summary of the most common use cases

Local maxima of a list:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-gypiav

Out[1]=1

Find areas in an elevation map that rise above their surroundings by at least 0.2:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-3rwz1d

Out[1]=1

Detect maxima of a 3D image:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-fpr9nl

Out[1]=1

Scope (1)Survey of the scope of standard use cases

Local maxima of a matrix:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-bm6pgp

Applications (6)Sample problems that can be solved with this function

Find the stars and stripes in the US flag:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-naitfg

Out[1]=1

Use MaxDetect and MinDetect to find salt-and-pepper noise:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-shcowa

Out[1]=1

Detect corners in an image:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-n29cg

Out[1]=1

Detect bright stars and use them as a mask for inpainting:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-im00t

Out[1]=1

Compute the ultimate erosion of objects in an image:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-g2xp5w

Out[1]=1

Detect frequency peaks of a signal:

In[1]:=1

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https://wolfram.com/xid/0pur46hnzq-dshz3a

In[2]:=2

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https://wolfram.com/xid/0pur46hnzq-l2d8p2

Out[2]=2

In[3]:=3

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https://wolfram.com/xid/0pur46hnzq-wpv3q9

Out[3]=3

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