opencv 3.1 installation and BaseFilter class

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Ok. So I need to apply box averaging filter that ignores some values in the image that are defined as non-existing. E.g., if the non-existing is defined as 0. then if you box average with size 5 over this array 0 1 1 1 0, then in the middle of the array you will get (1 + 1 + 1)/3 = 1 instead of (0 + 1 + 1 + 1 + 0)/5 in the regular box averaging case.

what about making it a 5x5 matrix then, and apply with filter2D()

I can't see how that will work. with filter2D() one needs a fixed kernel. But here fixed kernel won't work since you don't know where your "undefined" values are in the image.

may be you can use this post