Detection robustness (e.g., to geometric distortions, to compression).

in non-blind watermarking schemes there is an access to original cover or host data to extract the embedded watermark signal; thus, for embedding we need less information to embed in compare with blind schemes which results in higher quality of watermarked cover data and even more robustness. That's the advantage of Non-Blind watermarking scheme over blind and semi-blind watermarking schemes.