I used vl_slic to oversegment the following image.
I tried both using the RGB image and LAB image for superpixel segmentation.
Strangely, I find some superpixels which are disconnected regions, instead of whole regions!! I do not know why, if it is a bug in my own way of giving inputs or it is an actual bug.
Here is my command for segmentation:
% Read the RGB image
fileName = [num2str(imgInd) '_rgb'];
load(sprintf(imgFile, imgInd),'imgRgb');
rgbImg = im2double(imgRgb);
% % For LAB colorspace
regionSize = 30; %25 ;
regularizer = 30; %50;
imglab = vl_xyz2lab(vl_rgb2xyz(single(img))) ;
structSuperpix(1).segments = vl_slic(single(imglab), regionSize, regularizer);
% For RGB colorspace
regionSize = 25;%30;
regularizer = 0.008;%0.01;
structSuperpix(1).segments = vl_slic(single(img), regionSize, regularizer);
The input Image:
Broken superpixel using LAB image:
Broken superpixel using RGB image:
Moreover, I need to provide different values of regularizer for equivalent shaped superpixels. Superpixels obtained with LAB colorspace appear more irregular than that using RGB colorspace.
What might be the reason?
