The frequency domain representation of the box filter is a 2D sinc, which is just a product of 2 1D sinc functions (one for the x direction, and one for the y direction). You can find the math behind this here: https://www.robots.ox.ac.uk/~az/lectures/ia/lect2.pdf (slide 15 in particular).
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Gaussian Smoothing can blur image. This link below might be helpful if anyone is intersted about it.
https://homepages.inf.ed.ac.uk/rbf/HIPR2/gsmooth.htm
The frequency domain representation of the box filter is a 2D sinc, which is just a product of 2 1D sinc functions (one for the x direction, and one for the y direction). You can find the math behind this here: https://www.robots.ox.ac.uk/~az/lectures/ia/lect2.pdf (slide 15 in particular).
Gaussian Smoothing can blur image. This link below might be helpful if anyone is intersted about it. https://homepages.inf.ed.ac.uk/rbf/HIPR2/gsmooth.htm