Hi Ghada,
As per my understanding, you are looking for help with blurring an image by calculating the average value of each pixel using a 3-by-3 kernel. This process involves applying a simple averaging filter to smooth the image. Below is how it can be achieved:
I = imread('cameraman.tif'); % Read the image
I2 = im2double(I); % Convert image to double
kernel = ones(3)/9; % Define a 3x3 averaging kernel
I3 = conv2(I2, kernel, "same"); % Apply convolution
imshow(I3); % Display the image
The above code works for grayscale images. For an RGB image, replace “conv2” with “convn” to handle multiple color channels.
To learn more about the “conv2” and “conv” functions, refer to the MATLAB documentation links below:
- conv2: https://www.mathworks.com/help/releases/r2024b/matlab/ref/conv2.html
- conv: https://www.mathworks.com/help/ releases/r2024b matlab/ref/convn.html
I hope this answers your question.
