What is a 2D Gaussian?
In fluorescence microscopy a 2D Gaussian function is used to approximate the Airy disk, describing the intensity distribution produced by a point source. In signal processing they serve to define Gaussian filters, such as in image processing where 2D Gaussians are used for Gaussian blurs.
What is a 2D Gaussian kernel?
Brief Description. The Gaussian smoothing operator is a 2-D convolution operator that is used to `blur' images and remove detail and noise. In this sense it is similar to the mean filter, but it uses a different kernel that represents the shape of a Gaussian (`bell-shaped') hump.