Image rotation(by 90 degress) in OpenCV

Question

Can anyone suggest me how to rotate an image by 90 degrees? any implemented function in opencv?

i think transpose of an image is totally different from 90 degree rotation (both clockwise and anti-clockwise)

Answer 1

It's not the most efficient way, but it's so easy

cv::transpose(img, res);

cv::flip(res, res, 1);