Elements of the gaussians functions

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Óscar
Óscar 2015-1-3
评论： Image Analyst 2015-1-5
Last time I worked with Gaussians functions was a long time ago, so I know that this is a stupid question but I can't find the answer anywhere. It's about the elements of the Gaussian functions. Here you can see everything:
The first line is what I want to implement. The second line is the definition of the Gaussian function, where 0 is the mean and the sigma^2 is the variance, but I can't find anywhere where is the 'point' or as shown in the first formula dn.
Thank you very much for your help with this easy/novice question
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Óscar
Óscar 2015-1-5
Yes Star, and it says what is each thing, but I don't understand what is the dn inside the formula. For example, in Matlab you have: GAUSSMF(X, [SIGMA, C]) = EXP(-(X - C).^2/(2*SIGMA^2)); Where X are the points where the gaussian function is evaluated. So what I'm wondering is if that 'dn' are also the points where the function is evaluated.
Image Analyst
Image Analyst 2015-1-5
Like I said in my answer below, they have C as 0 and dn is X-C = X. I think you should concentrate on the concept and not so much on the confusing notation.

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Image Analyst
Image Analyst 2015-1-3
I don't know what that first equation is but it looks like a filter of some kind (convolution, correlation, spatial, linear). If you have the Image Processing Toolbox, you can get the gaussian from fspecial(), and do the filtering with conv2() or imfilter().
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Óscar
Óscar 2015-1-3
OK thank you, but i mean in the 2nd function which is the first part of the ()?
Thanks
Image Analyst
Image Analyst 2015-1-3
I think it would be x or dn, which is basically the distance from the center of the hump since the mean is at 0.

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