# Indexing to make an image in MATLAB1

Posted by Doug Hull,

I got a quick question today on how to make a diamond appear on an image in MATLAB. This is really an exercise in indexing and for loops in MATLAB. Let’s see how you can make an image in MATLAB.

## 1 CommentsOldest to Newest

Sean de Wolski replied on : 1 of 1
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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