中文说明：
实现了图像的加水印，去噪，加噪声等功能，基于kaiser窗的双谱线插值FFT谐波分析，用于建立主成分分析模型。
English Description：
The functions of image watermarking, denoising and noise adding are realized. The harmonic analysis of bispectral interpolation FFT based on Kaiser window is used to establish the principal component analysis model.