SLIC is superpixel extraction (segmentation) method based on a local version of k-means. For a detailed description of the algorithm, see the SLIC API reference.
This demo shows how to use SLIC to extract superpixels from this image:
The image to be segmented
In the simplest form, SLIC can be called as:
% im contains the input RGB image as a SINGLE array
regionSize = 10 ;
regularizer = 10 ;
segments = vl_slic(im, regionSize, regularizer) ;
By making varting regionSize and
regularizer one obtains the segmentations:
SLIC segmentations
SLIC is often intended to be applied on top of LAB rather than RGB
images. To do this, simpyl convert the image to LAB format before
calling vl_slic.
% IM contains the image in RGB format as before
imlab = vl_xyz2lab(vl_rgb2xyz(im)) ;
segments = vl_slic(imlab, 10, 0.1) ;