MATLAB: Can anyone please explain the meaning of this code

centroid

if true
  % code
boundaries=bwboundaries(handImage1);
x = boundaries{1}(:, 2);
y = boundaries{1}(:, 1);
hold on;
plot(x, y, 'black', 'LineWidth', 2);
newImage = bwlabel(handImage1);
measurements = regionprops(newImage, 'Centroid', 'BoundingBox');
xCentroid = measurements.Centroid(1);
yCentroid = measurements.Centroid(2);
subplot(2, 2, 4);
imshow(newImage);
title('Binary Image with Centroid Marked'); 
hold on;
plot(xCentroid, yCentroid, 'r*', 'MarkerSize', 10, 'LineWidth', 2);
end
Here, what are x and y?

Best Answer

MATLAB is rich with documentation, you may read the respective functions documentation.
boundaries=bwboundaries(handImage1);    % get;s the boudaries of the feature present in the image, the output is cell
x = boundaries{1}(:, 2);   % select x coordinates of first boundary 
y = boundaries{1}(:, 1);   % select y coordinates of first boundary 
hold on;
plot(x, y, 'black', 'LineWidth', 2);  % plotting the first boundary 
newImage = bwlabel(handImage1);       % labelling the image 
measurements = regionprops(newImage, 'Centroid', 'BoundingBox');  % get the properits of the region 
% picking the centroid of the first label 
xCentroid = measurements.Centroid(1);
yCentroid = measurements.Centroid(2);
subplot(2, 2, 4);   % sub plotting 
imshow(newImage);   % shows image 
title('Binary Image with Centroid Marked'); 
hold on;
plot(xCentroid, yCentroid, 'r*', 'MarkerSize', 10, 'LineWidth', 2);   % plotting the coentorid
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