[WM]: Fundamental queries on watermarking

[nrc3@ee.duke.edu]

Hi,
I am exploring research in this area. However, I have some basic question= s like why can't we do watermarking after compression for
different image/audio = formats ?
Can someone give me some basic papers on spread spectrum and quantization watermarking and how the watermarks are extracted either
blindly or using=  a priori information ? 

Thank you so much,

Nilima




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