在OpenCV 3.1中，离散傅立叶变换对我不起作用

Question

我是OpenCV的新手。目前，我使用的是3.1版。

我尝试使用OpenCV doc for DFT中编写的确切代码来实现DFT，但我在Mat_<float>(padded)部分收到错误：

我用于测试的图像是JPEG，3通道，8位。

如果我有任何错误，请告诉我。

#include "opencv2\core\core.hpp"
#include "opencv2\highgui\highgui.hpp"
#include <iostream>
using namespace cv;
using namespace std;
int main(int argc, char** argv)
{
 Mat rawImg = imread("E:/sample.jpg", CV_LOAD_IMAGE_COLOR); // 50x50 jpeg     
 Mat padded;                            //expand input image to optimal size
 int m = getOptimalDFTSize(rawImg.rows);
 int n = getOptimalDFTSize(rawImg.cols);
 cout << "rows :" << m << endl;
 cout << "cols :" << n << endl;
 copyMakeBorder(rawImg, padded, 0, m - rawImg.rows, 0, n - rawImg.cols,     BORDER_CONSTANT, Scalar::all(0));
 Mat planes[] = {Mat_<float>(padded),Mat::zeros(padded.size(),CV_32F)};
 Mat complexI;
 merge(planes, 2, complexI);         // Add to the expanded another plane with zeros

 dft(complexI, complexI);            // this way the result may fit in the source matrix

split(complexI, planes);                   // planes[0] = Re(DFT(I), planes[1] = Im(DFT(I))
magnitude(planes[0], planes[1], planes[0]);// planes[0] = magnitude
Mat magI = planes[0];

magI += Scalar::all(1);                    // switch to logarithmic scale
log(magI, magI);

// crop the spectrum, if it has an odd number of rows or columns
magI = magI(Rect(0, 0, magI.cols & -2, magI.rows & -2));

/** As my input image is 50x50 it has no extra pixel to delete I have ommited this part from the original code
**/

normalize(magI, magI, 0, 1, CV_MINMAX); // Transform the matrix with float values into a
// viewable image form (float between values 0 and 1).

imshow("Input Image", rawImg);    // Show the result
imshow("spectrum magnitude", magI);
waitKey(0);
return 0;
}