通过频域变换的方法实现图像的放大，该代码是实现对4:2:0YUV视频序列的放大，相对于普通的插值算法有较好的效果。-By frequency-domain transform method for image magnification, the code is to achieve the 4:2:0 YUV video sequence amplification, relative to the general interpolation algorithm has a good effect.