how to convolve one image with another image in matlab

To convolve one image with another image in MATLAB, you can use the conv2 function.

Here's an example of convolving an image with a Gaussian filter:

main.m
% read in the image
img = imread('image.jpg'); 

% create a Gaussian filter
G = fspecial('gaussian', [5 5], 1); 

% convolve the image with the Gaussian filter
filtered_img = conv2(double(img(:,:,1)), G, 'same');

% display the filtered image
imshow(uint8(filtered_img));
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In this example, fspecial is used to create a Gaussian filter with a size of 5x5 and a standard deviation of 1. The image img is then converted to double precision and the first channel is convolved with the Gaussian filter using conv2. Finally, the result is converted back to uint8 format and displayed using imshow.