How to flip an IplImage

Question

Is there an easy non costly method to flip an IplImage along the y-axis ? I'm working with high framerates.

Answer 1

Why not use C++ API Mat? Try this out and see if it works with your requirement. Just replace IplImage* img with your frame.

IplImage* img = cvLoadImage("c:\\test.jpg");
cvFlip(img, img, 0);
cvNamedWindow("result", CV_WINDOW_AUTOSIZE);
cvShowImage("result", img);
cvWaitKey(0);
cvDestroyWindow("result");

Answer 2

There is cvFlip (see Operation On Arrays) that can do in place flipping. Horizontal, vertical and combined flipping is supported.

Example: Flipping y-axis:

cvFlip(Image, NULL, 1);