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bwclearborder

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bwclearborder

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Same thing as IMCLEARBORDER, but faster for 2 and 3-dimensional binary images.

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Description

This function removes white (true) objects touching the border of a 2 or 3-dimensional logical image. It produces the same result as IMCLEARBORDER and has the same syntax. It's just faster!

NOTE: The more sparse the image is, the faster this function is compared to IMCLEARBORDER.

%% Speed and Equality Comparison
tim = zeros(3,1); %time for imclearborder
tbw = zeros(3,1); %time for bwclearborder
idx = 0;

for n = [10 100 250] %side length of 3d volume
    idx = idx+1;
    A = rand(n,n,n)>.75;
    t1 = 0;
    t2 = 0;
    for ii = 1:5
        tic
        I = imclearborder(A);
        t1 = t1+toc;
        tic
        B = bwclearborder(A);
        t2 = t2+toc;
    end
    tim(idx) = tim(idx)+t1;
    tbw(idx) = tbw(idx)+t2;
end

isequal(I,B)
%{
    ans = 1
%}

tbw
%{
        0.0086875
        1.033
       19.462
%}

tim
%{
     0.055181
       5.3955
       87.671
%}

tbw./tim
%{
      0.15744
      0.19145
      0.22198
%}

Required Products Image Processing Toolbox
MATLAB release MATLAB 7.9 (R2009b)
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