coconut_tools.magnetogram.nonlinear_diffusion_filter

Nonlinear diffusion filter based on Perona-Malik edge-preserving smoothing.

Author: Jose Murteira Cleaned, modularized and refactored by: Luis

Functions

nonlinearDiffusionFilter(image, dx, dy, ...)

Apply nonlinear isotropic diffusion filtering to a 2D image using Perona-Malik method.
coconut_tools.magnetogram.nonlinear_diffusion_filter.nonlinearDiffusionFilter(image, dx, dy, iterations, tau=1.0, image_seq=None)[source]

Apply nonlinear isotropic diffusion filtering to a 2D image using Perona-Malik method.

Parameters:

  • image (np.ndarray) – 2D array representing the image to be filtered.

  • dx (float) – Pixel spacing in x-direction.

  • dy (float) – Pixel spacing in y-direction.

  • iterations (int) – Number of iterations.

  • tau (float) – Time step for the iteration. Default is 1.0.

  • image_seq (list, optional) – If provided, saves intermediate results here.

Returns:

Filtered image and final timestep used.

Return type:

Tuple[np.ndarray, float]