Which segmentation method process by the following MATLAB code ?

[img] = imread('test.jpg');

img = rgb2gray(img);

tolerance = 12; % default setting in imageSegmenter

%% >>>>>>>>>> GET INITIALIZATION POINTS <<<<<<<<<< %%

str = 'Click to select initialization points. Press ENTER to confirm.';

fig_sel = figure(); imshow(img);

title(str,'Color','b','FontSize',10);

fprintf(['\nNote: ' str '\n'...

'Pressing ENTER ends the selection without adding a final point.\n' ...

'Pressing BACKSPACE/DELETE removes the previously selected point.\n'] );

% select points in figure and close afterwards

[x, y] = getpts(fig_sel);

close(fig_sel);

%% >>>>>>>>>> PROCESS INITIALIZATION POINTS <<<<<<<<<< %%

if length(x) == 0

fprintf('\nError: No points specified. An initialization point is needed!');

else

segmentations = zeros([size(img) length(x)]);

fig_result = figure(); hold on;

for i = 1:length(x)

% confusing: y corresponds to row, x to column in img

column = ceil(x(i));

row = ceil(y(i));

%>>> this is where the magic happens <<<%

segmentations(:,:,i) = grayconnected(img,row,column,tolerance);

% show corresponding initialization point

subplot(1,2,1); imshow(img); hold on;

title('Active point (red)');

plot(x(i),y(i),'r.','MarkerSize',10); % active in red

plot(x(1:end ~= i),y(1:end ~= i),'b.','MarkerSize',5); % ... others in blue

hold off;

% ... with segmentation result

title('Segmentation result');

subplot(1,2,2); imshow(segmentations(:,:,i));

% click through results

waitforbuttonpress

end

close(fig_result);

end