包含特征值与特征向量的提取、训练样本以及最后的识别，实现了图像的加水印，去噪，加噪声等功能，已经调试成功.内含m文件，可直接运行。- Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, Realize image watermarking, de-noising, plus noise and other functions, Has been su