getsequence (Image Processing Toolbox User's Guide)

Image Processing Toolbox User's Guide

Extract sequence of decomposed structuring elements

Syntax

```
SEQ = getsequence(SE)
```

Description

SEQ = getsequence(SE), where SE is a structuring element array, returns another structuring element array SEQ containing the individual structuring elements that form the decomposition of SE. SEQ is equivalent to SE, but the elements of SEQ have no decomposition.

Class Support

SE and SEQ are arrays of STREL objects.

Example

The strel function uses decomposition for square structuring elements larger than 3-by-3. Use getsequence to extract the decomposed structuring elements.

se = strel('square',5)
seq = getsequence(se)
se =
Flat STREL object containing 25 neighbors.
Decomposition: 2 STREL objects containing a total of 10 neighbors

Neighborhood:
     1     1     1     1     1
     1     1     1     1     1
     1     1     1     1     1
     1     1     1     1     1
     1     1     1     1     1
seq =
2x1 array of STREL objects

Use imdilate with the 'full' option to see that dilating sequentially with the decomposed structuring elements really does form a 5-by-5 square:

```
imdilate(1,seq,'full')
```

See Also

imdilate, imerode, strel

getrect gray2ind