Hi,
You can follow bellow steps to sample random patches from the image:
- Load image in MATLAB.
- Specify the size of the patches you want to extract.
- Generate random coordinates to extract patches.
- Use the coordinates to extract patches from the image.
Refer to the below pseudo code for a better understanding:
% Read the image
image = imread('face_image.jpg'); % Replace with your image file
% Convert to grayscale if the image is colored
if size(image, 3) == 3
image = rgb2gray(image);
end
% Define the patch size
patchSize = [50, 50]; % Example patch size of 50x50 pixels
% Get the size of the image
[imageHeight, imageWidth] = size(image);
% Number of patches you want to sample
numPatches = 5;
% Initialize a cell array to hold patches
patches = cell(1, numPatches);
% Randomly sample patches
for i = 1:numPatches
% Randomly select the top-left corner of the patch
x = randi([1, imageWidth - patchSize(2) + 1]);
y = randi([1, imageHeight - patchSize(1) + 1]);
% Extract the patch
patch = image(y:y+patchSize(1)-1, x:x+patchSize(2)-1);
% Store the patch
patches{i} = patch;
end
% Display the patches
figure;
for i = 1:numPatches
subplot(1, numPatches, i);
imshow(patches{i});
title(['Patch ', num2str(i)]);
end
