[WM]: About patchwork in Watermarking

["EE" <si5@ee.knu.ac.kr>]

Hi, Watermarkers

I have some questions about patchwork algorithm.
In patchwork algorithm, I know that  a pair of samples(or bins) adds or subtract some value.
i.e. one add it and another subtract it.
Embedder knows the combination infomation of two samples(or bins)
so it is difficult for other people to extract watermark information. 

By the way, if we conduct time scaling after embedding
Combination of two samples(or bins) used in embedding is twisted or got tangled~~
Therefore it it difficul is twisted or got tangled~t to extract watermark info.
Is it right??

And also can I ask the merit and shortcoming of patch work, especially shortcoming?

I will wait a good word.
Best regard.

Kim


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