SmoothPatchBased node¶
This documentation is for version 2.0 of SmoothPatchBased (net.sf.cimg.CImgDenoise).
Description¶
Denoise selected images by non-local patch averaging.
This uses the method described in: Non-Local Image Smoothing by Applying Anisotropic Diffusion PDE’s in the Space of Patches (D. Tschumperlé, L. Brun), ICIP’09 (https://tschumperle.users.greyc.fr/publications/tschumperle_icip09.pdf).
Uses the ‘blur_patch’ function from the CImg library.
CImg is a free, open-source library distributed under the CeCILL-C (close to the GNU LGPL) or CeCILL (compatible with the GNU GPL) licenses. It can be used in commercial applications (see http://cimg.eu).
Inputs¶
Input | Description | Optional |
---|---|---|
Source | No | |
Mask | Yes |
Controls¶
Parameter / script name | Type | Default | Function |
---|---|---|---|
Spatial Std Dev / sigma_s |
Double | 10 | Standard deviation of the spatial kernel, in pixel units (>=0). |
Value Std Dev / sigma_r |
Double | 0.05 | Standard deviation of the range kernel, in intensity units (>=0). In the context of denoising, Liu et al. (“Noise estimation from a single image”, CVPR2006) recommend a value of 1.95*sigma_n, where sigma_n is the local image noise. |
Patch Size / psize |
Integer | 5 | Size of the patchs, in pixels (>=0). |
Lookup Size / lsize |
Integer | 6 | Size of the window to search similar patchs, in pixels (>=0). |
Smoothness / smoothness |
Double | 1 | Smoothness for the patch comparison, in pixels (>=0). |
fast Approximation / is_fast_approximation |
Boolean | On | Tells if a fast approximation of the gaussian function is used or not |
(Un)premult / premult |
Boolean | Off | Divide the image by the alpha channel before processing, and re-multiply it afterwards. Use if the input images are premultiplied. |
Invert Mask / maskInvert |
Boolean | Off | When checked, the effect is fully applied where the mask is 0. |
Mix / mix |
Double | 1 | Mix factor between the original and the transformed image. |