this a method of watermarking. where SVD and DCT both are used to get robust and secure watermarking -this is a method of watermarking. where SVD and DCT both are used to get robust and secure watermarking

四种滤波（SVD滤波，PCA滤波，DCT滤波，DWT滤波）对图像处理，有程序代码和对应图片-Four kinds of filter for image processing