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How to get the region of interest(ROI) in matlab?

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ezhil K
ezhil K 2019-1-2
回答： Image Analyst 2019-1-3
I have written a code to get the region of interest.But I dont get any output here.I have attached my code.I have also attached my input image.Can anyone help me in getting output?
I = imread('Frame 0001.png');
BW = roipoly(I);
imshow(I);
figure
imshow(BW);
Frame 0001.png
  2 个评论
Matt J
Matt J 2019-1-2
编辑：Matt J 2019-1-2
What error messages are returned? If none, then what is displayed in your second figure and what does
>> whos BW
return?
ezhil K
ezhil K 2019-1-3
No error messages are returned.But I don't get aby image for second imshow().I get only the figure window alone.

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采纳的回答

Image Analyst
Image Analyst 2019-1-3
It's doing what you told it to.
Did you actually left-click three or more points then right-click to close off the polynomial, then double click inside of the polygon to accept it?
I think you did not. I did and it did in fact show the mask binary image I drew.

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