Question

I am using the connected component labeling algorithm in Matlab. Is it possible to use different color for different labels when showing the output? (Even though the labels have the same intensity).

Clarification:
I used connected component labeling algorithm to label the connected components of a binary images. Now I got different labels. All the labels contains pixel of equal intensity. (All the labels have pixel intensity value of 1) and all the labels appear in the same color. I want to display the different labels using different colors so that I can eliminate the unwanted one easier.

Answer 1

That is easy – use the imagesc function:

p = imread('peppers.png'); %Read image
b = (p(:,:,2)>100); % Thresholding by some constant threshold

If you already have a binary image, just use this section of the code: (b is the image)

L = bwlabel(b); %Find components
figure();   %Create figure
imagesc(L);  %Draw the components, each in its own color.

You can also change the colors by using the colormap command:

 colormap(bone)

In order to customize the colors, define an nx3 matrix, and give it as input to colormap

cm = [1 0 0; 
      0 1 0; 
      0 0 1
      0 1 1 
      1 1 0
    ];
colormap(cm)