图像分块加水印\lena.bmp ..............\NC.m ..............\PSNR.m ..............\qq5.bmp ..............\shuiyin1.asv ..............\shuiyin1.m ..............\watermarked.bmp ..............\watermarked1.bmp ..............\watermarked2.bmp ..............\NC.asv 图像分块加水印