说明：  比较了软阈值，硬阈值及当今各种阈值计算方法,实现了图像的加水印，去噪，加噪声等功能，多机电力系统仿真及其潮流计算。
( Comparison of soft threshold and hard threshold and today various threshold calculation method, Realize image watermarking, de-noising, plus noise and other functions, Multi-machine power system simulation and flow calculation.)