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Ideal two dimensional step function

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Ayesha
Ayesha 2015-2-16
编辑： Ayesha 2015-2-17
I am currently implementing a 5x5 kernel suing the following ideal two-dimensional step function:
My first question is: Is this ideal 2D step function based on Heuckel's algorithm?
This function is geometrically represented as follows:
I have generated the 5x5 by iterating the rows and columns up to 5 units. However, I am still trying to understand the geometric representation. Given I want to construct a 5x5 kernel and 'a' here denotes the diameter, what would be the radius? And what is 'h' in 'a+h'. Overall, how can one interpret this geometric representation?

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