Matlab script code for Adaptive median fitering

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Amar 2013-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/69110-matlab-script-code-for-adaptive-median-fitering

评论： Hanisha Viswanatham 2016-7-21

I need a simple matlab script code for adaptive median filtering with no errors.I have tried many codes but failed to execute a single one.Also I don't know what is a mex file and how to convert the code into a mex file.

The code will have to able to process image of any size and remove the noise associated with it.

Any help will be highly appreciated.

Thank you.

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reena meshram 2016-4-27

what is the coding in smf cmf amf value in noisey image

Image Analyst 2016-4-27

I have no idea what those acronyms are.

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Answer 1

Image Analyst 2013-3-31

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What kind of adaption is being done? I have one that removes salt and pepper noise if you want that. It is just straight MATLAB - no mex files needed.

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Image Analyst 2013-3-31

在 MATLAB Online 中打开

Here's the demo. I have a color version -- if you want that one, let me know.

clc;  % Clear command window.
clear;  % Delete all variables.
close all;  % Close all figure windows except those created by imtool.
imtool close all;  % Close all figure windows created by imtool.
workspace;  % Make sure the workspace panel is showing.
fontSize = 15;
% Read in a standard MATLAB demo image.
folder = fullfile(matlabroot, '\toolbox\images\imdemos');
baseFileName = 'coins.png';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
  % Didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
grayImage = imread(fullFileName);
% Get the dimensions of the image.  numberOfColorBands should be = 1.
[rows columns numberOfColorBands] = size(grayImage);
% Display the original image.
subplot(2, 2, 1);
imshow(grayImage);
title('Original Gray Scale Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'Position', get(0,'Screensize')); 
% Generate a noisy image with salt and pepper noise.
noisyImage = imnoise(grayImage,'salt & pepper', 0.05);
subplot(2, 2, 2);
imshow(noisyImage);
title('Image with Salt and Pepper Noise', 'FontSize', fontSize);
% Median Filter the image:
medianFilteredImage = medfilt2(noisyImage, [3 3]);
% Find the noise.  It will have a gray level of either 0 or 255.
noiseImage = (noisyImage == 0 | noisyImage == 255);
% Get rid of the noise by replacing with median.
noiseFreeImage = noisyImage; % Initialize
noiseFreeImage(noiseImage) = medianFilteredImage(noiseImage); % Replace.
% Display the image.
subplot(2, 2, 3);
imshow(noiseFreeImage);
title('Restored Image', 'FontSize', fontSize);

Image Analyst 2016-6-17

That's what the above attached m-file "salt_and_pepper_noise_removal.m" is!

Hanisha Viswanatham 2016-7-21

can I get code on same filter but for a random valued noise?

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Answer 2

Amar 2013-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/69110-matlab-script-code-for-adaptive-median-fitering#answer_80546

ya, That would be good.I just need a working code for adaptive median fitering.

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Image Analyst 2013-3-31

This is not an "answer" to your question, so it should have been a comment to my answer. I'll put my response there.

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Matlab script code for Adaptive median fitering

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Matlab script code for Adaptive median fitering

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