How can I prevent moving ROI out of the image edges?

Question

azim 2015-12-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260632-how-can-i-prevent-moving-roi-out-of-the-image-edges

回答： azim 2015-12-17

I have a Region Of Interest (ROI) on an image. Please see the following code:

a=imread('rice.png'); I=imshow (a); e = imellipse(gca,[]);

The ROI can be moved on the image by mouse dragging. I want that the ROI cannot be able to move out of the image, and be stopped when its bounds reach to the image edges. I would be much appreciated it if you could help me for resolving this problem. Thank you very much

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2015-12-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/260632-how-can-i-prevent-moving-roi-out-of-the-image-edges#answer_203476

在 MATLAB Online 中打开

Did you happen to look at the help for imellipse and see the very first example:

figure, imshow('cameraman.tif');
h = imellipse(gca, [10 10 100 100]);
addNewPositionCallback(h,@(p) title(mat2str(p,3)));
fcn = makeConstrainToRectFcn('imellipse',get(gca,'XLim'),get(gca,'YLim'));
setPositionConstraintFcn(h,fcn);