smoothing image with moving average filter

Hello i have a question. how can i smoothing this image with moving average filter 5*5 for only green Thank you so much.

Answer 1

[Rushil]

Hi

From what I understood, the task at hand is to compute a moving average over each 5x5 window, in order to smoothen the image. This can be accomplished using the conv2 function, using a filter of size 5x5 with all values being . You can find the supporting documentation of conv2 at the link below:

https://mathworks.com/help/matlab/ref/conv2.html

Below is some implementation that may help:

img = imread("file_name.jpeg"); 

% isolate the green channel 
green = img(:, :, 2); 
filter = ones(5, 5) / 25; 

% here we use convolution for faster implementation 
% the result is a moving mean in a 5x5 window 
paddedGreenChannel = padarray(green, [2, 2], 'replicate'); 
% padding to avoid wrong mean calculation for edges 
smoothedGreenChannel = conv2(double(paddedGreenChannel), filter, 'valid'); 
smoothedGreenChannel = uint8(smoothedGreenChannel); 

% replace the green channel with the update one
smoothedImg = img; 
smoothedImg(:, :, 2) = smoothedGreenChannel; 

% to plot and compare both the images 
figure; 
subplot(1, 2, 1); 
imshow(img); 
title('Original Image'); 

subplot(1, 2, 2); 
imshow(smoothedImg); 
title('Smoothed Image'); 

Hope it's helpful