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POJava Image Connective Component
 

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    <p>I have this program to detect objects in a binarized BufferedImage, which the image is a multiple choice answer sheet.<br> I'm trying to use 4-Connectivity as in to detect each object (answer on the sheet).<br> So far what I have in hand as source is these:</p> <ol> <li><a href="http://en.wikipedia.org/wiki/Connected-component_labeling" rel="nofollow">http://en.wikipedia.org/wiki/Connected-component_labeling</a></li> <li><a href="http://homepages.inf.ed.ac.uk/rbf/HIPR2/label.htm" rel="nofollow">http://homepages.inf.ed.ac.uk/rbf/HIPR2/label.htm</a></li> </ol> <p>and I have came up with this, following instructions from Wikipedia:</p> <pre><code>if(getPixel(image, x, y) != 0){ if(getPixel(image, x-1, y) !=0){ System.out.println("we are in the same region"); region[x][y] = region[x-1][y]; } else if(getPixel(image, x-1, y) !=0 &amp;&amp; getPixel(image, x, y-1) !=0){ System.out.println("North and West pixels belong to the same region and must be merged"); region[x][y] = Math.min(region[x-1][y], region[x][y-1]); } else if( getPixel(image, x-1, y) ==0 &amp;&amp; getPixel(image, x, y-1) !=0){ System.out.println("Assign the label of the North pixel to the current pixel"); region[x][y] = region[x][y-1]; } else if(getPixel(image, x-1, y) ==0 &amp;&amp; getPixel(image, x, y-1) ==0){ System.out.println("Create a new label id and assign it to the current pixel"); cpt++; region[x][y] = cpt; } </code></pre> <p>But the problem is it creates 51 regions! and it only prints a couple of top pixels of each object (not all pixels).<br> Can anyone please help me to find what the problem is and how can I detect my objects?<br> I would appreciate any help.</p>
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    1. COBased on the order of your `if/else if` code, the second code block (the first `else if`) will never be called. I don't think this is what you want.
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    2. CO@supersam654 yes you're right, its never called, where should I put it? thanks
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