【OpenCV4】C++ 创建二维汉宁窗 Hann Window / Hanning Window

汉宁窗作用：

• 防止在 DFT 或 FFT 过程中出现频率泄露

代码：

#include 
#include "opencv2/highgui.hpp"

#define PI 3.1415926

cv::Mat CreatHannWindow(int width, int height)
{
    cv::Mat vertical(height, 1, CV_32FC1);
    cv::Mat horizontal(1, width, CV_32FC1);
    for (int r = 0; r < height; r++)
    {
        vertical.at(r, 0) = 0.5 - 0.5 * cos(2 * PI * r / (height - 1));
    }
    for (int c = 0; c < width; c++)
    {
        horizontal.at(0, c) = 0.5 - 0.5 * cos(2 * PI * c / (width - 1));
    }
    cv::Mat out = vertical * horizontal;
    return out;
}

int main()
{
    cv::Mat out = CreatHannWindow(200, 200);

    return 1;
}

得到的汉宁窗效果：