说明：  双线性差值实现图像缩放，通用型强，输入图像可以是文件路径、矩阵，并且RGB和灰度图均可；可以实现放大和缩小；可以自定义缩放因子；可以保存缩放后的图像。有详细注释。
(Bilinear difference image scaling, universal strong input image can be a file path, matrix, and RGB and grayscale can can zoom in and out can customize scaling factor can save the image after scaling. There are detailed notes.)