GaussKern2D(width,h​eight,s)

Version 1.12.0.0 (850 Bytes) by Nils Persson
Fast 2-dimensional Gaussian kernel generator
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102 Downloads
Updated 15 Oct 2015

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Quickly generate 2-D Gaussian kernel given a covariance matrix and window size.
width = half-width of kernel window (integer)
height = half-height of kernel window (integer)
s = 2x2 covariance matrix
Yes, this supports anisotropic and rotated Gaussians (major axis does not have to be x- or y-axis).
This code is designed to be fast, therefore it is not built out with lots of features. I have expanded and vectorized all of the computations. It runs on the order of 0.1ms.

Cite As

Nils Persson (2025). GaussKern2D(width,height,s) (https://www.mathworks.com/matlabcentral/fileexchange/53536-gausskern2d-width-height-s), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2015a
Compatible with any release
Platform Compatibility
Windows macOS Linux
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Version Published Release Notes
1.12.0.0

Had this useless extra inverse calculation I forgot to delete.
1.11.0.0

added a pretty picture
1.1.0.0

Using analytical formula for 2x2 inverse now.
1.0.0.0

Added a description.