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    //QTime time;
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    //QTime time;
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    //time.start();
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    //time.start();
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    cv::Mat fI;
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    cv::Mat fI;
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    cv::dft(I, fI, cv::DFT_ROWS + cv::DFT_COMPLEX_OUTPUT);
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    cv::dft(I, fI, cv::DFT_ROWS + cv::DFT_COMPLEX_OUTPUT);
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    //std::cout << "elapsed: " << time.restart() << std::endl;
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    //std::cout << "elapsed: " << time.restart() << std::endl;
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    fI = fI.reshape(N*2, h);
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    fI = fI.reshape(N*2, h);
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    std::vector<cv::Mat> fIcomp;
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    std::vector<cv::Mat> fIcomp;
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    cv::split(fI, fIcomp);
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    cv::split(fI, fIcomp);
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    return fIcomp;
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    return fIcomp;
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