An intuition on filtering. (in: DSP and Plugin Devel…)
By: mystran
2 Apr 07:29
If you convolve a box-car with itself multiple times, you get B-spline basis functions which converge to gaussian. Already with 3 rounds it’s starting to approximate the gaussian shape, so doing 3-4 rounds of box blur is a reasonable approach to image blurring. It’s also separable (can blur one axis at a time) and even though the kernel isn’t quite rotationally symmetric, it’s close enough after a few rounds.
That said, in image processing the information of interest is in the spatial domain an…
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