基于神经网络的数字水印提取 ..........................\Arnold.m ..........................\jpeg压缩试验.m ..........................\psnr.m ..........................\zigzag.m ..........................\不带神经网络的jpeg压缩试验.m ..........................\带神经网络的jpeg压缩试验.m ..........................\方案一.m ..........................\方案三.m ..........................\方案二.m ..........................\置乱.m