How Do I Show Angle After Completing Fourier Transform In Opencv?

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C++

C

Visual-Studio

OpenCV

I am new in opencv. After completing Fourier transform, i have also got display the angle.I want to show in my window how many degree it is.please give me some idea.

// crop the spectrum, if it has an odd number of rows or columns
     int m = getOptimalDFTSize( canny_image.rows );
    int n = getOptimalDFTSize( canny_image.cols ); // on the border add zero values
    copyMakeBorder(canny_image, padded, 0, m - canny_image.rows, 0, n - canny_image.cols, BORDER_CONSTANT, Scalar::all(0));

    Mat planes[2] = {Mat_<float>(padded), Mat::zeros(padded.size(), CV_32F)};
    Mat complexcanny_image;
    merge(planes, 2, complexcanny_image);         // Add to the expanded another plane with zeros
	
    dft(complexcanny_image, complexcanny_image);            // this way the result may fit in the source matrix
	
    // compute the magnitude and switch to logarithmic scale
    // => log(1 + sqrt(Re(DFT(I))^2 + Im(DFT(I))^2))
    split(complexcanny_image, planes);                   // planes[0] = Re(DFT(I), planes[1] = Im(DFT(I))
    magnitude(planes[0], planes[1], canny_image);// planes[0] = magnitude
    //Mat canny_image = planes[0];
	
    canny_image += Scalar::all(1);                    // switch to logarithmic scale
    log(canny_image,canny_image);
	
    // crop the spectrum, if it has an odd number of rows or columns
    canny_image = canny_image(Rect(0, 0, canny_image.cols & -2, canny_image.rows & -2));


 // rearrange the quadrants of Fourier image  so that the origin is at the image center
    int cx = canny_image.cols/2;
    int cy = canny_image.rows/2;

    Mat q0(canny_image, Rect(0, 0, cx, cy));   // Top-Left - Create a ROI per quadrant
    Mat q1(canny_image, Rect(cx, 0, cx, cy));  // Top-Right
    Mat q2(canny_image, Rect(0, cy, cx, cy));  // Bottom-Left
    Mat q3(canny_image, Rect(cx, cy, cx, cy)); // Bottom-Right

    Mat tmp;                           // swap quadrants (Top-Left with Bottom-Right)
    q0.copyTo(tmp);
    q3.copyTo(q0);
    tmp.copyTo(q3);
	
    q1.copyTo(tmp);                    // swap quadrant (Top-Right with Bottom-Left)
    q2.copyTo(q1);
    tmp.copyTo(q2);

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

	
 imshow("spectrum magnitude", canny_image);