3.3. Mean Curvature Blur

3.3.1. Overview

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.

Mean Curvature algorithm is describes in Wikipedia

3.3.2. Activate the filter

You can find this filter in the image menu under FiltersBlurMean Curvature Blur…

3.3.3. Indstillinger

Figur 17.12. Mean Curvature Blur filter parameters

Mean Curvature Blur filter parameters

Presets, Preview, Split view

These options are common to GEGL-based filters. Please refer to Afsnit 2, “Fælles funktioner”.

Iterations

Increasing Iterations increases blur.

Clipping

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.

3.3.4. Examples

Original image

Iterations = 4

Mean Curvature Blur can be used to denoise an image:

Figur 17.13. Mean Curvature Blur to denoise

Mean Curvature Blur to denoise

Original image

Mean Curvature Blur to denoise

Iterations = 9