Efficient three-dimensional (3D) Gaussian smoothing using convolution via frequency domain by Max W.K. Law

Native Fourier implementation, support GPU computation and anisotropic voxel. (3d, volumetric, gaussian smoothing)

gauss3filter.m

Image gradients with Gaussian smoothing by David Young

Image grey-level gradients are estimated using Gaussian smoothing followed by differencing. (image processing, image smoothing, gaussian smoothing)

exindex(arr, varargin)

gradients_xy(image1, varargin)

gradients_xyt(image1, image2, varargin)