Regularize geometry at a speed proportional to the local mean curvature value: this filter uses the mean curvature algorithm to blur the image preserving edges.
The Mean Curvature algorithm is described on Wikipedia.
These options are common to GEGL-based filters. Please refer to Secção 2, “Common Features”.
Increasing Iterations increases blur.
The result of this filter can be larger than the original image. With the default Adjust option, the layer will be automatically resized as necessary when the filter is applied. With the Clip option the result will be clipped to the layer boundary.