Finding fitgmdist value range from histogram

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banikr
banikr 2020-4-13
评论： Image Analyst 2020-4-15
Hello Altruists,
I have some data in 'rawdata.mat'
I want find the intensity distribution of the rawdata. For example, if we take the histogram of:
H = histogram(J);
Looks like there are 2/3 Gaussian models. I want to take the one with maximum mean. But how do I find the range of values under that Gaussian distribution. For example the max Gaussian mean is at 234.
How do I choose the range of the Gaussian distribution?
GMModel = fitgmdist(double(J),2);

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回答（1 个）

Image Analyst
Image Analyst 2020-4-13
See my File Exchange submission where you can fit the data to any number of Gaussians:
Fit Multiple Gaussians
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Image Analyst
Image Analyst 2020-4-15
You're getting some sort of error. It's not being displayed because it seems some helper functions are not included. I'm including them here.
Image Analyst
Image Analyst 2020-4-15
Your data does not fit 3 or even 4 Gaussians well at all. Anyway, I'm attaching the code, test1.m, that works for 4 Gaussians and you can see that there is not a good fit for just Pure Gaussians.
There seems to be a ramp. You might try using fitnlm() and add in the ramp. I'm attaching a demo for fitnlm.
Adapt it to fit 3 Gaussians.

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