问题
I am trying to find the dominant frequencies in an image using OpenCV. I saw the dft example in the OpenCV tutorial but how can I find the dominant frequencies of an image with periodic structures? I want to extract the spectral informations of the lowest harmonics, copy them to a new image and do reverse dft. A sample image is attached to this question.
来源：https://stackoverflow.com/questions/13720683/opencv-find-image-frequencies