Manual object counter inside an image

Hi

How can I program a very simple manual counter on top of an image that I show (GUI). Basically, I wish to load an image to a axes and every time I click the mouse a point and its counting number appears next to it.

Thanks.

Answer 1

[Image Analyst]

From the help:

[x,y] = ginput gathers an unlimited number of points until you press the Return key.

Put some code in like this (untested)

message = sprintf('Click points.\nHit return when done.');
button = questdlg(message, 'Continue?', 'Yes', 'No', 'Yes');
drawnow;  % Refresh screen to get rid of dialog box remnants.
if strcmpi(button, 'No')
   return;
end
[x,y] = ginput();
count = length(x);

[Ely Raz]

Thanks.

Based on your code I used this:

function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

axes(handles.axes1);
I = imread('coins.png');
imshow(I);
message = sprintf('Click points.\nHit return when done.');
button = questdlg(message, 'Continue?', 'Yes', 'No', 'Yes');
drawnow;  % Refresh screen to get rid of dialog box remnants.
if strcmpi(button, 'No')
   return;
end
[x,y] = ginput();
counter = length(x);
disp(counter)

The counter works fine but it does not mark the clicks in a visual point, can it be added?

Thanks again

[Image Analyst]

Only after it's done when you can say

plot(x, y, 'r+', 'MarkerSize', 24, 'LineWidth', 3);

If you want it to mark after each one you'll have to put ginput(1) inside a while loop

% Display an image.
imshow('moon.tif');
hold on;
% Initialize counter.
count = 0;
message = sprintf('Click as many points as you want.\nHit return when done.');
title(message, 'FontSize', 20);
button = questdlg(message, 'Continue?', 'OK', 'Cancel', 'OK');
drawnow;  % Refresh screen to get rid of dialog box remnants.
if strcmpi(button, 'Cancel')
  return;
end

% Begin loop where user clicks points over display (plot or image or whatever).
while count < 1000 % or whatever failsafe you want.
  % User clicks one point.  If user types Enter/Return, x is empty.
  [x,y] = ginput(1);
  if isempty(x)
    break;
  end
  % Put a cross over the point.
  plot(x, y, 'r+', 'MarkerSize', 24, 'LineWidth', 3);
  % Increment the count.
  count = count + 1
  % Save coordinates (if desired).
  allX(count) = x;
  allY(count) = y;
end

Please mark as Accepted if this answers your question.

[Ely Raz]

Hi,

A question about the script above (I click the mouse for marking and enter when I am done). Is it possible to mark by mouse left clicking and when finish mouse right clicking?

Thanks.