use filter to emphasize symmetric parts of image in matlab

To emphasize the symmetric parts of an image in MATLAB, we can use a filter that detects symmetry. One approach is to use a convolution filter that computes the difference between the image and a mirror-reversed version of itself. This can be done using the filter2 function.

Here's some sample code that demonstrates how to apply such a filter:


main.m
% Load an example image
img = imread('example_image.png');

% Define a horizontal symmetric filter
filter_size = 11;
filter = ones(1, filter_size) / filter_size;
filter_center = ceil(filter_size / 2);
filter(filter_center) = -1;

% Apply the filter using convolution
symmetry_map = filter2(filter, img, 'same');

% Scale the output to the range [0, 1]
symmetry_map = symmetry_map - min(symmetry_map(:));
symmetry_map = symmetry_map / max(symmetry_map(:));

% Display the input and output images
figure;
subplot(1, 2, 1); imshow(img); title('Input image');
subplot(1, 2, 2); imshow(symmetry_map); title('Symmetry map');

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This code loads an example image, defines a horizontal symmetric filter, applies the filter using convolution, and scales the output to the range [0, 1]. The resulting image is a symmetry map that highlights the symmetric parts of the input image.

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