How to convert a Mat variable type in an IplImage variable type in OpenCV 2.0?

opencv iplimage
Spredzy picture Spredzy · Mar 18, 2010 · Viewed 52.7k times · Source

I am trying to rotate an image in OpenCV.

I've used this code that I found here on Stack Overflow:

Mat source(img);
Point2f src_center(source.cols/2.0, source.rows/2.0);
Mat rot_mat = getRotationMatrix2D(src_center, 40.0, 1.0);
Mat dst;
warpAffine(source, dst, rot_mat, source.size());

Once I have my dst Mat variable type filled up I would like to put it back to an IplImage variable type, any idea about how to do this?

Answer

jeff7 picture jeff7 · Mar 22, 2010

In the new OpenCV 2.0 C++ interface it's not really necessary to change from back and forth between Mat and IplImage, but if you want to you can use the IplImage operator:

IplImage dst_img = dst;

Note that only the IplImage header is created and the data (pixels) will be shared. For more info see the OpenCV C++ interface or the image.cpp example in the OpenCV-2.0/samples/c directory.

Related questions

Conversion from IplImage* to cv::MAT

I searched to convert an IplImage* to Mat, but all answers were about the conversion to cvMat. How, can I do it? and what is the difference between Mat and cvMat? Thanks in advance

Read More
openCv crop image

I running into problems with my openCv IplImage cropping. Assuming both tmp and img are IplImage* . Using the code: printf("Orig dimensions: %dx%d\n", img->width, img->height); cvSetImageROI(img, cvRect(0, 0,500,500)); tmp = cvCreateImage(cvGetSize(img),img->…

Read More
Explanation of IplImage* img

I just started learning OpenCV with "Learning OpenCV Computer Vision with the OpenCV Library". In the first example which demonstrates how to display a picture, it has a line IplImage* img = cvLoadImage("name.type") Although the book explains it, I …

Read More