MATLAB: Dilate Objects in image

Question

Hi,

I have an image containing different objects and I would like to dilate each object with a different disk width.

For example I have an image containing 3 circles and I would like to dilate each circle differently depending on their area. A circle having an area (found using regionprops) greater then 1000 is dilated using se = strlen('disk',20) while a circle with a smaller area is dilated using se = strlen('disk',10). How can this be done? please help.

Thanks

Nathalie

Answer 1

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);