ac_resample(ac, ratio[; filter])

Resample three-dimensional autocorrelation function ac by a ratio of ratio times along the third axis, i.e. ac of shape (x,y,z) becomes an array of shape (x,y,ratio * z).

filter_coeffs(length)

Get coefficients of symmetrical low-pass FIR filter of length 2length-1 which maps autocorrelation functions to autocorrelation functions. Argument length being equal to n is enough for upscaling autocorrelations function n times.