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Is this kernel name as mean difference kernel or Laplacian filter?

enter image description here

Is mean difference just a method?

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There are many approximations for the Laplacian Filter (See The Hypermedia Image Processing Reference - Laplacian/Laplacian of Gaussian):

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Indeed this is an High Pass Filter. Namely it will remove low frequencies (Specifically it will remove the DC Value, namely the output image will have mean value of 0).

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    $\begingroup$ Thank you @Royi. $\endgroup$ – Sun Dec 27 '20 at 22:22
  • $\begingroup$ @Sun, You're welcome. Please mark the answer (Click the V symbol). $\endgroup$ – Royi Dec 27 '20 at 22:24

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