jpeg attacks and watermarking?

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nadia
nadia 2017-5-30
评论： nadia 2017-6-1
I have a problem with watermarking in DCT domain. I divide image into 8*8 blocks and DCT transformed each block. when I embed with strength factor alpha={1,...,10}, in jpeg attack with quality Q=60 , Q=40, by increasing alpha the NC value decreased but in Q=50 , Q=100 the NC value increased, what is the problem? is it reasonable?

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