gaussian filtering

Hello forum,
question about gaussian kernel.

take an image 512x512. Does the gaussian filter size (usually and odd size), depend on the standard deviation of the filter?

What I mean is: the discrete approximation to the kernel makes it go to zero after 3 sigmas.

If the kernel is, say, 5x5 for sigma1. If we increase the sigma such that
sigma2=2*sigma1, do I need to increase the size of the kernel? By how much?
Twice the size? 11X11?

thanks
fisico30 Start a New Thread

--- In i..., marcoscipioni1@... wrote:
>
> Hello forum,
> question about gaussian kernel.
>
> take an image 512x512. Does the gaussian filter size (usually and odd size), depend on the standard deviation of the filter?
>
> What I mean is: the discrete approximation to the kernel makes it go to zero after 3 sigmas.
>
> If the kernel is, say, 5x5 for sigma1. If we increase the sigma such that
> sigma2=2*sigma1, do I need to increase the size of the kernel? By how much?
> Twice the size? 11X11?
>
> thanks
> fisico30
>

The gaussian filter size don't need to change because of the change in its content.....Khalid Gidaya. Start a New Thread