get a cropped image using mouse click

Hello,

I want to crop an image using coordinates of mouse click. I find a solution with handler function, but the problem is that I can't get results from the function. I used the following code:

function demoOnImageClick (I)
clc;clear;
imObj = imread(I);
disp(size(imObj));
figure;
hAxes = axes();
imageHandle = imshow(imObj);
set(imageHandle,'ButtonDownFcn',@ImageClickCallback);

function coordinates = ImageClickCallback ( objectHandle , eventData )
axesHandle  = get(objectHandle,'Parent');
coordinates = get(axesHandle,'CurrentPoint'); 
coordinates = coordinates(1,1:2);
end
  end

Using this code, I can't get coordinates at each click to use them in the imcrop function. What can I do?

[Guillaume]

Note there is absolutely no point in having clear at the start of a function.

Answer 1

[Guillaume]

The simplest way to get mouse coordinates on your image is to use ginput:

imshow(img);
[columns, rows] = ginput;

But also note that if you call imcrop without specifying the cropping coordinates you get an interactive tool anyway, so I would just do:

[croppedimage, rect] = imcrop(img);

[mariem farhat]

ok, Thanks. It works