utils

blur(d, h)

blur_disk(N, rad)

blur_kernel2(N, rad)

blur_kernel3(N, rad)

dft_lap(dshape, units=None, use_rfft=False)

the dft of the laplacian stencil in 2d

divergence(u)

the divergence of vector field u where u[i,…] are the components

finite_deriv_dft_central(dshape, units=None, use_rfft=False)

the dft of the central finite differences in 2d

i.e. the fft of the stencil [1,0,-1]

myconvolve(x, h, is_fft=False)

psf(dshape, sigmas=(2.0, 2.0))

psf_airy(dshape, rads=(2.0, 2.0))

soft_thresh(x, lam)

the solution to

w = argmin 1/2*(w-x)^2+lam*|w|