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Actually I need to crop a rectangle portion in an image. I am having two points p1 and p2 of the rectangle. After cropping the rectangle I need to store that one for further reference.

Somashekar
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    This question was already asked here (multiple times). stackoverflow requires that you perform search before posting question. – Michael Burdinov Apr 07 '14 at 13:38
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    possible duplicate of [crop and Save ROI as new image in OpenCV 2.4.2 using cv::Mat](http://stackoverflow.com/questions/16014093/crop-and-save-roi-as-new-image-in-opencv-2-4-2-using-cvmat) – Michael Burdinov Apr 07 '14 at 13:40
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    It's not working for me. Please suggest me if anything else is there. – Somashekar Apr 08 '14 at 05:14

1 Answers1

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Hi i know this is an old question, but this could be helpful to someone else having the same problem.

Given a rectangle containing your 

roi:    Rect 
rect(topLeft_X,topLeft_Y,bottomRight_X,bottomRight_Y);

Say the image you want to crop is detectROI, than to crop the roi given the above rectangle, simply do the following: 

Mat roi = detectROI(rect);

Than to save this image: 

imwrite("ROI.jpg", roi);
J. Chomel
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