OpenCV图像处理，怎么把CV_64FC1的图像转换为CV_8UC1或者CV_16UC1？

OpenCV图像处理，怎么把CV_64FC1的图像转换为CV_8UC1或者CV_16UC1？从而可以显示出来，比如通过imshow。
分块DCT变换：dct(float_R(subwindows), DCTR(subwindows));
现在DCTR是CV_64FC1矩阵，无法显示；怎么转成CV_8UC1或者CV_16UC1呢？？？急

https://stackoverflow.com/questions/30371982/how-to-convert-an-image-from-cv-8uc1-to-cv-32fc1-type-in-opencv

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https://blog.csdn.net/weixin_42441233/article/details/104625941