Hello Dheer,
You can modify the code below to extract patches from the SIFT Features key points
for i = 1:length(valid_points)
% Get the position of the keypoint
x = round(valid_points(i).Location(1));
y = round(valid_points(i).Location(2));
% Define the patch boundaries
x_start = max(1, x - half_patch);
x_end = min(size(img, 2), x + half_patch - 1);
y_start = max(1, y - half_patch);
y_end = min(size(img, 1), y + half_patch - 1);
% Extract the patch
patch = img(y_start:y_end, x_start:x_end);
% Ensure the patch is 4x4 by padding if necessary
if size(patch, 1) < patch_size || size(patch, 2) < patch_size
patch = padarray(patch, [patch_size - size(patch, 1), patch_size - size(patch, 2)], 'post');
end
% Display or process the patch as needed
% imshow(patch); pause(0.1); % Uncomment to display each patch
end
