Relevant to Blender v2.31

Anti Noise Filter

<filter type="antinoise" name="Anti Noise" radius = "1.000000" max_delta = "0.100000">

Depth of Field Filter

<filter type="dof" name="dof" focus = "12.5" near_blur ="10.000000" far_blur ="10.000000" scale ="2.000000">

The Depth of Field filter is a 2D filter, i.e. a post processing technique, and as such, has advantages and disadvantages. It uses the rendered image, plus a Z Buffer (which tells the filter how far away each pixel is from the camera) to figure out which pixels are blurred or not blurred.

Because its a 2D effect it has the advantage of being extremely quick. However there are a few disadvantages:

Reflections are not blurred correctly. If you look at a reflection, you'll notice that the reflection's blur is based on the distance from the camera of the reflection plane, not the object in the reflection.

Because the DOF is done on a 2D image, rather than a 3D scene, the blur cannot know what is behind any given object, therefore often the edges of an extremely blurred object in the foreground will look smudgy or dirty.

If you keep these limitations in mind, the Depth of Field filter can produce great looking Depth of Field effects very quickly.