width in Gaussian fitting
Dahair
Mon, 03/31/2014 - 11:05 am
Hi, I'm doing some experimental image analysis and need to use 2D Gaussian fit. In the form of 2D Gaussian fitting function, there are factors named as "xWidth" and "yWidth". I cannot find the meaning of these two factor and want to know the relation of these factors to the peak width of half height.
But if cor != 0, then the principle directions of the Gaussian are not along the X and Y axes, and then I'm not sure what the expression would be for the principle directions.
John Weeks
WaveMetrics, Inc.
support@wavemetrics.com
March 31, 2014 at 01:54 pm - Permalink
Thanks John!
I have one question about your answer.
If cor != 0. Does that mean "2*sqrt(2*ln(2)) times the xWidth" will be the Width of fitted 2D Gaussian function at Half Maximum along x-axis, but in this condition, x-axis is not the principle direction of the the fitted 2D Gaussian? (The same as yWidth)
Thanks!
October 25, 2014 at 04:59 pm - Permalink
John Weeks
WaveMetrics, Inc.
support@wavemetrics.com
October 27, 2014 at 10:30 am - Permalink
Thanks John,
Before, cor is the factor related to the rotation angle which is the angle principle axis to x-axis(or y-axis). But it seems not. Do you have any idea what this value means?
Thanks!
November 5, 2014 at 02:59 pm - Permalink
John Weeks
WaveMetrics, Inc.
support@wavemetrics.com
November 6, 2014 at 09:42 am - Permalink