Description: Improved code based on dct watermarking, watermark injection, extraction, anti-attack test
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改进后的基于dct的水印代码，水印注入、提取、防攻击测试\attack.m
.....................................................\dft2_watermarked.bmp
.....................................................\dft_attackwatermarked.bmp
.....................................................\dft_recover.m
.....................................................\dft_recovercopyright.bmp
.....................................................\embed.m
.....................................................\main.m
.....................................................\nc.m
.....................................................\psnr.m
.....................................................\recover.m
.....................................................\watermark.bmp
.....................................................\watermark4.bmp
.....................................................\watermark6.bmp
.....................................................\_lena_std_bw.bmp
.....................................................\复件 watermark.bmp
改进后的基于dct的水印代码，水印注入、提取、防攻击测试
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