How to extract the ROI using impoly?

Question

Sabarinathan Vadivelu 2012-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/50148-how-to-extract-the-roi-using-impoly

回答： Karbala'a Unvi. Science 2014-11-21

using impoly(); how to extract the Region of Interest alone?? Here Im getting Errors.

grayImage = imread('pout.tif');
figure, imshow(grayImage);
h = impoly;
position = wait(h);
croppedImage = imcrop(grayImage, position);
figure;
imshow(croppedImage);

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Answer 1

David Legland 2012-10-8

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编辑：David Legland 2012-10-8

在 MATLAB Online 中打开

Hi,

You should use either imcrop, or impoly.

Using imcrop, you can select a rectangular region of interset. By the way, there is also a syntax "IMG2 = imcrop(IMG);". You can use like this:

   grayImage = imread('pout.tif');
   figure, imshow(grayImage);
   img2 = imcrop;
   imshow(img2)

Using impoly, you can select a polygonal region of interest. This polygon can be represented as an ordered list of vertex coordinates. You can then convert this polygon into a binary mask by using "roipoly" function.

regards, David