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Questions tagged [anisotropic-diffusion]

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How does the “additive operator splitting” exactly work?

I am reading about the non-linear (or non-homogenous) diffusion method (aka anistropic diffusion method). There are several ways of implementing this method. In all cases, we first need to discretise ...
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1answer
18 views

Why is the anisotropic diffusion equivalent to the heat equation when using a constant diffusion coefficient?

The anisotropic diffusion is defined as $$\frac{\partial I}{\partial t} = \mathrm{div} \left( c(x,y,t) \nabla I \right)= \nabla c \cdot \nabla I + c(x,y,t) \Delta I$$ where $\operatorname{div}$ is ...
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0answers
64 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 ...
1
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1answer
99 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
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0answers
133 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
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1answer
996 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, ...
5
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2answers
6k 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
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1answer
390 views

Perona Malik Anisotropic Diffusion Filter in HLSL

I'm trying to write a perona malik filter in HLSL ...
1
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1answer
519 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 ...
2
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1answer
175 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
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2answers
334 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 ...
10
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1answer
7k 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 ...
4
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1answer
942 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 ...