add doc

matlab/tfgm/utils/generate_mask.m

@@ -4,7 +4,8 @@ function [mask,varargout] = generate_mask(tf_mat_wideband, tf_mat_loc, alpha, se
 % [original_mask, mask_after_imclose, mask_after_imopen,...,
 %    mask] = generate_mask(tf_mat_wideband, tf_mat_loc, alpha, seuil, radius)
 
-% function that generates a binary mask
+% This function generates a binary mask using math morphology. We used 
+% 'disk' structuring element and a radius is given as input.
 % 
 % Inputs: