I am using a morphological function (imopen, imclose,....) on a 3D binary volume. I use these functions with a flat structuring element (for example, strel('disk',3)). How are the opening and closing performed on the 3D image. I understand how these functions are applied to 2D images, but since I use a flat (2D) structuring element, how is the function applied? Each slice at a time? What directions?
Thank you in advance for the help.