A function that returns a 2d guassian
A function that returns a 2d guassian
function that takes (x,y) and returns guassian value
A function that returns a 2d guassian, parameterized as if in 1d
A function that returns a 2d guassian, parameterized as if in 1d
function that takes (x,y) and returns guassian value
Function that returns a uniform circle
Predefined functions useful for generating kernels