imclose (Image Processing Toolbox User's Guide)

Image Processing Toolbox User's Guide

Close an image

Syntax

IM2 = imclose(IM,SE)
IM2 = imclose(IM,NHOOD)

Description

IM2 = imclose(IM,SE) performs morphological closing on the grayscale or binary image IM, returning the closed image, IM2. The structuring element, SE, must be a single structuring element object, as opposed to an array of objects.

IM2 = imclose(IM,NHOOD) performs closing with the structuring element strel(NHOOD), where NHOOD is an array of 0's and 1's that specifies the structuring element neighborhood.

Class Support

IM can be any numeric or logical class and any dimension, and must be nonsparse. If IM is logical, then SE must be flat. IM2 has the same class as IM.

Example

This example uses imclose to join the circles in the image together by filling in the gaps between them and by smoothening their outer edges.

Read the image into the MATLAB workspace and view it.

originalBW = imread('circles.png');
imshow(originalBW);

Create a disk-shaped structuring element. Use a disk structuring element to preserve the circular nature of the object. Specify a radius of 10 pixels so that the largest gap gets filled.

```
se = strel('disk',10);
```

Perform a morphological close operation on the image.

closeBW = imclose(originalBW,se);
figure, imshow(closeBW)

See Also

imdilate, imerode, imopen, strel

imclearborder imcomplement