MATLAB: What units is the number in strel(‘disk’, 22)

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dilated = imdilate(ImagetoDilate,strel('disk', 22));

I have this line in my code to dilate the image, but I was wondering what units the 22 is? It says it is the radius but is it measured in centimeters, percentage, pixels or something else?

Best Answer

Pixels.

Or more correctly, memory locations, as the result is used in multiple contexts and makes no attempt to handle multiple color planes.

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MATLAB: Dilate Objects in image

You have to get 2 binary images. Each one containing only the circles of less than, or greater than 100 pixels. See my Image Segmentation Tutorial where I extract out coins of different diameters using find() and ismember(). http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 Let me know if you can't adapt it. If that is the case, attach your image and your best attempt at adapting the code.

Then call imdilate() on each image.

se1 = strlen('disk', 20)
dilated1 = imdilate(binaryImage1, se1);
se2 = strlen('disk', 10)
dilated2 = imdilate(binaryImage2, se2);

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What does segment out mean to you? You can create a circular mask from code in the FAQ. http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

Then you can use the mask as an index, or multiply it by the image to produce an image blackened everywhere except in the mask.

Best Answer

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MATLAB: Dilate Objects in image

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