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SANTIAGO AJA-FERNANDEZ

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Universidad de Valladolid

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Files Posted by SANTIAGO AJA-FERNANDEZ View all
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16 Dec 2014 Screenshot Noise estimator for SENSE MRI It estimates the variable map of noise from SENSE magnetic resonance using a homomorphic approach. Author: SANTIAGO AJA-FERNANDEZ noise estimation, image processing, magnetic resonance 17 0
18 Feb 2014 Screenshot Soft thresholding for image segmentation Image segmentation based on histogram soft thresholding Author: SANTIAGO AJA-FERNANDEZ fuzzy, thresholding, image processing, segmentation 125 13
  • 4.8
4.8 | 5 ratings
12 Jun 2012 Screenshot LMMSE filter for Rician MRI data A filtering scheme for denoising MR data assuming an underlying Rician model. Author: SANTIAGO AJA-FERNANDEZ mri, noise, denoising, image filtering, image processing 17 3
  • 4.0
4.0 | 1 rating
31 May 2012 Screenshot Quality Index based on Local Variance (QILV) Method to assess image quality based on local variance comparison with Golden Standard Author: SANTIAGO AJA-FERNANDEZ image processing, quality, quality assessment, local variance, image quality 15 1
  • 5.0
5.0 | 2 ratings
29 May 2012 Screenshot Parallel MRI noisy phantom simulator Simulator of noisy parallel acquisition MR data (GRAPPA and SENSE included) Author: SANTIAGO AJA-FERNANDEZ magnetic resonance, noise, parallel imaging, phantom, noise simulator, image processing 43 2
  • 5.0
5.0 | 3 ratings
Comments and Ratings by SANTIAGO AJA-FERNANDEZ View all
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27 Jan 2014 Soft thresholding for image segmentation Image segmentation based on histogram soft thresholding Author: SANTIAGO AJA-FERNANDEZ

Answer to Arnold: Your output will strongly depend on the input image. COntact me by mail and I can check where it is failing.

29 Nov 2012 Detail Preserving Anosotropic Diffusion for Speckle Filtering (DPAD) DPAD applies an anisotropic diffusion scheme to an image with multiplicative speckle Author: SANTIAGO AJA-FERNANDEZ

What you have called I0 must be the input image. Note that you cannot name a variable with a number in matlab. Try Io instead. In addition, it is not an example, but an example of use. You must have some image Io and use it as your input.

25 Jun 2012 Soft thresholding for image segmentation Image segmentation based on histogram soft thresholding Author: SANTIAGO AJA-FERNANDEZ

Modify anything you want, of course. It should be easy. I cannot say when next version will be ready, sorry. I'll try to do it along these months.

18 Jun 2012 Soft thresholding for image segmentation Image segmentation based on histogram soft thresholding Author: SANTIAGO AJA-FERNANDEZ

The function is a basic implementation thought for 2D, but with very small changes it could work for 3D. The square neighborhoods used for smoothing and aggregation must be replaced by 3D neighborhoods. (I'll do it for the next version...)

12 Jun 2012 LMMSE filter for Rician MRI data A filtering scheme for denoising MR data assuming an underlying Rician model. Author: SANTIAGO AJA-FERNANDEZ

The method now requires to choose one of the existing noise estimation methods as an input: (See help)

I_est=MRI_lmmse(I,[7,7],'mode2N');

However, I have just realized that the function moda.m is not in the toolbox. I upload now a new version with this fixed, and a default option

Comments and Ratings on SANTIAGO AJA-FERNANDEZ's Files View all
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18 Nov 2014 Parallel MRI noisy phantom simulator Simulator of noisy parallel acquisition MR data (GRAPPA and SENSE included) Author: SANTIAGO AJA-FERNANDEZ Huifeng

Really works!

29 Jul 2014 Detail Preserving Anosotropic Diffusion for Speckle Filtering (DPAD) DPAD applies an anisotropic diffusion scheme to an image with multiplicative speckle Author: SANTIAGO AJA-FERNANDEZ Jordan

15 Jul 2014 2-D adaptive noise-removal filtering Modified version of WIENER2 from image toolbox with proper noise estimation Author: SANTIAGO AJA-FERNANDEZ durga nandhini

01 Jul 2014 LMMSE filter for Rician MRI data A filtering scheme for denoising MR data assuming an underlying Rician model. Author: SANTIAGO AJA-FERNANDEZ Christian

very useful! thank you!

18 May 2014 Detail Preserving Anosotropic Diffusion for Speckle Filtering (DPAD) DPAD applies an anisotropic diffusion scheme to an image with multiplicative speckle Author: SANTIAGO AJA-FERNANDEZ Royi Avital

What do you think about this method:
https://github.com/JarnoRalli/PDE-based-image-processing/issues/1

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