# Questions tagged [anisotropic-diffusion]

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### Derivation of 9 point Laplacian filter

I'm reading a paper on how construct isotropic laplacian filter, and perhaps because it's an old paper, the notation in it really bothers me a lot. So can someone please explain it to me? For example, ...
2 votes
1 answer
42 views

### How are the edges of an image obtained with anisotropic diffusion?

I already know how to implement the method and obtain a correctly diffused image, but in the papers related to the topic there is usually an edge map that's calculated after the diffusion is performed ...
5 votes
1 answer
610 views

### Which Anisotropic Diffusion Method is Best for Denoising Now?

The best standard may be varying from PSNR to human's visual feeling. Any one is OK. I have tested J.Weickert's tensor diffusion and P&M's, they all can't satisfy me. Is there any anisotropic ...
4 votes
1 answer
1k views

### Anisotropic Diffusion Outputs

I am providing 2 d grey scale images to the anisotropic diffusion function in MATLAB but not getting desired outputs. How many iterations are ideal and how should i approach this problem?I am keeping ...
5 votes
2 answers
8k views

### Comparison of Bilateral Filter and Anisotropic Diffusion

What are the advantages / disadvantages of bilateral filter and anisotropic diffusion for noise reduction? EDIT: To be more specific - what are the practical differences in terms of quality, speed or ...
1 vote
0 answers
105 views

### Perona Malik Noise Estimator using Canny

In Perona and Malik, they state: a histogram of the absolute values of the gradient throughout the image was computed, and K was set equal to the ...
2 votes
1 answer
161 views

### Contour based blurring

Suppose I have an image of a cat and a binary mask image corresponding to cat's location as shown I would like to blur the image region surrounding the cat but as a function of distance from the cat'...
1 vote
0 answers
151 views

### Effect of Gaussian Smoothing to mean image intensity

I am implementing Perona-Malik Diffusion in using the formulas: Creating image at time k+1 using equation This is my implementation: ...
2 votes
1 answer
1k views

### How to implement anisotropic diffusion using java?

I am working on an image processing project in java where we use anisotropic diffusion for scale space generation. In the below equation, after finding the diffusion value.using the second equation, ...
1 vote
1 answer
522 views

### Perona Malik Anisotropic Diffusion Filter in HLSL

I'm trying to write a perona malik filter in HLSL ...
2 votes
1 answer
193 views

### What's the physical meanning and principle of applying anisotropic diffusion in transform domain？

I am reading several papers applying anisotropic diffusion in the transform domain like Shearlet, curvelet. All of them have got excellent results. The physical meaning and principle of applying ...
8 votes
2 answers
414 views

### main direction in 2D map of data

It may be a very simple question. We would appreciate any comments, guide or complete solution. We prefer however incomplete solutions but novel practical ideas. - How to find the main direction of ...
9 votes
1 answer
8k views

### Why is anisotropic diffusion useful in image processing?

I am working on anisotropic diffusion and the two coefficients proposed by Perona & Malik. I wanted to know what is the use of diffusion in image processing? Why is anisotropic diffusion ...