结合PCA的尺度不变特征变换(SIFT)算法，实现了图像的加水印，去噪，加噪声等功能，线性调频脉冲压缩的Matlab程序。- Combined with PCA scale invariant feature transform (SIFT) algorithm, Realize image watermarking, de-noising, plus noise and other functions, LFM pulse compression of the Matlab program.