function

代码说明：

  进行各种图形变换，很有用的程序。图象处理程序，包括对比度拉伸，傅立叶变换，离散余弦变换，维纳滤波等等。 (It s the function for DIP. Image processing involves changing the nature of an image in order to either 1.improve its pictorial information for human interpretation, or 2.render it more suitable for autonomous machine perception. )