How to clear all the connected pixel in order to separate every objects

Answer 1

[Mohammad Abouali]

use bwconncomp

Here is more info on that:

http://www.mathworks.com/help/images/ref/bwconncomp.html

[TAY]

But this function only provides the information, may I know howto use it to separate the objects?

[Mohammad Abouali]

Once you run the bwconncomp all the information about each object is there.

If you want to get more information you can pass the results to regionprops

perhaps this would be also helpful:

http://www.mathworks.com/help/images/image-enhancement-and-analysis.html