non-flat structuring element

[johnnychen94]

I find offsetstrel in MATLAB but doesn't see its support in either OpenCV or scikit-images. Thus I'm wondering if we want to bring this in. @ThomasRetornaz do you know if this is used widely?

non-flat erosion:

$$ \epsilon_b(x,y) = \min_{o\in\Omega}(f(x+o) - b(o)) $$

non-flat dilation:

$$ \delta_b(x,y) = \max_{o\in\Omega}(f(x-o) + b(o)) $$

here $\Omega$ is the offset displacement of the SE, and b is the value of the non-flat SE.

[ThomasRetornaz]

Hi o/, no it is not used widely. I just use it during my mm courses at school and never after
Furthermore if i remember properly [timholy] said that we could avoid to generalize op to non flat SE