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Why MORPH_ELLIPSE kernel is slower than MORPH_RECT and others?

I was doing some dilation and erosion operations and noticed that MORPH_ELLIPSE kernel takes much more time than MORPH_RECT and MORPH_CROSS kernel. A similar question and finding is also posted in StackOverflow here

Can somebody tell why this is so?

Why MORPH_ELLIPSE kernel is slower than MORPH_RECT and others?

I was doing some dilation and erosion operations and noticed that MORPH_ELLIPSE kernel takes much more time than MORPH_RECT and MORPH_CROSS kernel. A similar question and finding is also posted in StackOverflow here .

Can somebody tell why this is so?