CODEWITHSUNDEEP
copencv
winck
winck

Reputation: 1120

Write Portion of an Image to File

While I can write a whole image to a file with

cvSaveImage("image.png", img);

how can I write only a given rectangle from the image I'm working on to a file?

Upvotes: 0

Views: 94

Answers (1)

ArtemStorozhuk
ArtemStorozhuk

Reputation: 8725

There's Mat constructor:

Mat(const Mat& m, const Rect& roi);

So just use it!

Or if you use c (not c++) interface than you have to set ROI (Region Of Interest):

http://nashruddin.com/OpenCV_Region_of_Interest_(ROI)/

Your code should look like this:

cvSetImageROI(img, rect);//rect is a ROI
cvSaveImage("image.png", img);

If you want to work again with full image than you have to reset ROI:

cvResetImageROI( IplImage* img )

Upvotes: 1

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