From http://www.w3schools.com (Copyright Refsnes Data)

SVG feGaussianBlur Element

SVG Reference Complete SVG Reference

Definition and Usage

The SVG feGaussianBlur element is used to perform a Gaussian blur on the image.

The stdDeviation attribute defines the standard deviation for the blur operation.

Example 1

The following example shows an example of a feGaussianBlur filter.

Copy the following code into Notepad and save the file as "feGaussianBlur_1.svg". Place the file in your Web directory:

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg width="100%" height="100%" version="1.1"
xmlns="http://www.w3.org/2000/svg">

<defs>
<filter id="Gaussian_Blur">
<feGaussianBlur in="SourceGraphic" stdDeviation="5"/>
</filter>
</defs>

<ellipse cx="200" cy="150" rx="70" ry="40"
style="fill:#ff0000;stroke:#ffff00;
stroke-width:2;filter:url(#Gaussian_Blur)"/>

</svg>

View example

SVG Reference Complete SVG Reference

From http://www.w3schools.com (Copyright Refsnes Data)