Manual object counter inside an image

Question

Ely Raz 2014-1-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111571-manual-object-counter-inside-an-image

评论： Ely Raz 2014-1-7

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.

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Answer 1

Image Analyst 2014-1-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/111571-manual-object-counter-inside-an-image#answer_120174

在 MATLAB Online 中打开

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);

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Image Analyst 2014-1-6

编辑：Image Analyst 2014-1-6

在 MATLAB Online 中打开

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 2014-1-7

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.

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