Doug's MATLAB Video Tutorials

January 25th, 2013

By Doug Hull

Doug first used MATLAB in 1994, could not figure it out until he got some help in 1995. He is now dedicated to making sure that no one else wastes a year of their life not knowing MATLAB like he did.

11:12 UTC | Posted in Format: Video, Level: Basic | Permalink | 1 Comment »

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One Response to “Indexing to make an image in MATLAB”

1. Sean de Wolski replied on January 25th, 2013 at 13:08 UTC :
   

   And a few Image Processing approaches:

   %% Some info:
   % These have the convience of being easy to make multiple diamonds. Simply
   % turn any spot you want to have a diamond to be true.

   sz = [11 11];
   r = 3;

   %% Use BWDIST
   % Anywhere within the range of our true point will be on.

   I = false(sz); %false matrix
   I(ceil(sz(1)./2),ceil(sz(2)./2)) = true; %center (or wherever) is true.
   D = bwdist(I,’cityblock’)<=r; %true points are equal or closer than r in cityblock distance xform
   imagesc(D); %view it

   %% Use IMDILATE
   % Take our solo point and expand it
   %

   I = false(sz); %false matrix
   I(ceil(sz(1)./2),ceil(sz(2)./2)) = true; %center (or wherever) is true.
   D = imdilate(I,strel('diamond',r)); %Dilate with a diamond stucturing element.
   imagesc(D); %view it

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<pre class="code">
a = magic(3);
sum(a)
</pre>

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