Image Processing Toolbox User's Guide Previous page   Next Page
imextendedmin

Extended-minima transform

Syntax

Description

BW = imextendedmin(I,h) computes the extended-minima transform, which is the regional minima of the H-minima transform. h is a nonnegative scalar.

Regional minima are connected components of pixels with a constant intensity value, and whose external boundary pixels all have a higher value

By default, imextendedmin uses 8-connected neighborhoods for 2-D images, and 26-connected neighborhoods for 3-D images. For higher dimensions, imextendedmin uses conndef(ndims(I),'maximal').

BW = imextendedmin(I,h,CONN) computes the extended-minima transform, where CONN specifies the connectivity. CONN can have any of the following scalar values.

Value
Meaning
Two-dimensional connectivities
4
4-connected neighborhood
8
8-connected neighborhood
Three-dimensional connectivities
6
6-connected neighborhood
18
18-connected neighborhood
26
26-connected neighborhood

Connectivity can be defined in a more general way for any dimension by using for CONN a 3-by-3-by-...-by-3 matrix of 0's and 1's. The 1-valued elements define neighborhood locations relative to the center element of CONN. Note that CONN must be symmetric about its center element.

Class Support

I can be of any nonsparse numeric class and any dimension. BW has the same size as I and is always logical.

Example

See Also

conndef, imextendedmax, imreconstruct

Reference

[1]  Soille, P., Morphological Image Analysis: Principles and Applications, Springer-Verlag, 1999, pp. 170-171.


Previous page  imextendedmax imfill Next page

© 1994-2005 The MathWorks, Inc.