get a cropped image using mouse click

2015 7 8
1 个回答
更新时间：2015 7 9
1 次查看（30 天）

0 个投票

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?

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Guillaume
Guillaume 2015-7-8
Note there is absolutely no point in having clear at the start of a function.

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回答（1 个）

Guillaume
Guillaume 2015-7-8

3 个投票

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);

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