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Frequency filtering for pattern matching

I am trying to perform a pattern matching. I am stuck at doing frequency filtering when i try to multiply my image and my mask. Both of my image and my mask are suppose to be in the fourier space while I multiply them. Can you help me to solve this problem. Thanks I find the step in this website:

Mat planes[] = {Mat_<float>(roi), Mat::zeros(roi.size(), CV_32F)};  //roi is my mask
Mat complexI;
merge(planes, 2, complexI);
dft(complexI, complexI, DFT_COMPLEX_OUTPUT);

Mat planes2[] = {Mat_<float>(imgCanny), Mat::zeros(imgCanny.size(), CV_32F)}; //imgCanny is my image
Mat complexP;    //Complex plane to contain the DFT coefficients {[0]-Real,[1]-Img}
merge(planes2, 2, complexP);
dft(complexP, complexP);  // Applying DFT

Mat complexA;
complexA =  complexP * complexI;