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Further, HSMM differs from those models that embed positions in a nonparametric fashion, like BioHMM [ 13] and QuantiSNP [ 19], or as in the "instability-selection" model for LOH analysis [ 22, 23]; these all employ variations of exponential function to account for feature position.
Denote to be the embedding position of the st embedded bit.
If embedded position is less than 66 bits, the other positions must be chosen to embed watermark.
It is remarkable that the embedding position is kept secret from B, the classification of the above operations is difficult.
At the embedding position, the ciphertexts are and the post-processing operation outputs the watermarked coefficients as follows: (14).
The logistic map was used to generate a sequence as the watermark [11] or to encrypt the embedded position [10, 11] in former works.
It is noticed that the remaining DCT coefficients should be sent to B. In order to keep the secrecy of the embedding position, they must be encrypted before delivery.
They work in partnership with others and their embedded position at community levels means they are strategically placed to enhance vulnerable and disadvantaged populations in remote areas to access TB diagnosis and treatment CHWs have shown potential to improve coverage to effective and sustainable health services [ 25] and respond to chronic human resource constraints [ 26, 27].
The embedding positions are saved in the embedding phase, and when decoding, the embedding positions are recalled to extract the hidden data.
Both watermarking parameters and embedding positions are often important factors affecting the performance of watermarking systems.
Furthermore, the embedding positions can be retrieved by a single buyer, allowing for a locally targeted attack.
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