Can i use imerode() function to perform top-hat transform?

Hello ,

is it possible to perform top-hat transform without using imtophat() . I was suggested to use only the function imerode().

Can someone explain if is this correct and advice me which arguments should i put into strel() function as well?

Answer 1

[Subhadeep Koley]

You can achieve the same result as returned imtophat function only using imerode and imdilate.

% Load the image
original = imread('rice.png');
% Define the morphological structuring element (you can change it according to your application)
se = strel('disk', 12);
% Perform top-hat filtering without using imtophat(__)
openedImg = imdilate(imerode(original, se), se);
tophatFiltered1 = original - openedImg;

Now, calculate the same using imtophat

% Load the image
original = imread('rice.png');
% Define the morphological structuring element (you can change it according to your application)
se = strel('disk', 12);
% Perform top-hat filtering using imtophat(__)
tophatFiltered2 = imtophat(original, se);

Check if both approaches are giving the same results

isequal(tophatFiltered1, tophatFiltered2)

ans =

  logical

   1