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Hi..
Anyone know how to get the Kernal in our data set image (Dicom Format)
The example is in the red box.

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DGM
DGM 2021-4-30
编辑：DGM 2021-4-30

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It depends entirely upon what you intend to do with convolution/correlation. That page is a basic example intended to demonstrate the concept, so they're using that kernel because the uniqueness of its values aid in clarity when explaining the math and symmetry. The filter kernel in this case is magic(3), but you could use filters from fspecial() or elsewhere depending on the intent.

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