How to replace dft with fftw

[someonelikeypp]

Had anyone used fftw to replace dft experience?
thanks for help.

[someonelikeypp]

I am writing some test code here:
ComplexMat KCF_Tracker::fft2(const cv::Mat &input)
{
...
cv:Mat input_8U;
cv:Mat input_32F;

input.convertTo(input_32F, CV_32F);             //    first

input.convertTo(input_8U, CV_8U);
input_8U.convertTo(input_32F, CV_32F);      //    second

...

}
the first input_32F will equals the input, but the second input_32F won't equals input.

Because I need the correct input convert into CV_8U for my fftw's input, what should I do.

@vojirt

[qq297110281]

Do you figure out how to do it?