[SciPy-user] fitting mixed gaussians

Gael Varoquaux gael.varoquaux@normalesup....
Wed Jul 25 10:51:32 CDT 2007

On Wed, Jul 25, 2007 at 05:46:40PM +0200, Emanuele Zattin wrote:
> i'm trying to perform mixed-gaussian fitting on some small greyscale
> images (5x5 pixels, maximum 9x9). right now i'm using a leastsq
> approach but it tends to get pretty slow and unreliable when it comes
> to fit 4-5 2D gaussians even in such a small domain.

Is the gaussian spot well centered on the image ?

If so then I reckon you are interested in finding its width ? Maybe I am
wrong, byt if I am right an approach that works very well is to determine
the second momentum of the intensity/position distribution. This is not
an optimisation procedure and is very quick. Reliability depends on the
kind of data you are processing.

Some code doing this can be found on



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