I might be wrong but from my experience there is currently no node or set of nodes that lets blur an image in Vue.

There are the Smooth Clip and Smooth Map nodes that are sometimes useful for softening edges.

For example if you have a noise (non fractal) with the option "ridged" checked it will result in sharp ridges.
In such a case the above mentioned filter nodes can be used to soften those edges. But this works only because the edges all have the same value.

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