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Instead, different key-dependent filters are used at each decomposition level of the wavelet transform and for each decomposition orientation (i.e., horizontal and vertical).
Table 1 Weights for two choices for the contribution from each decomposition level (L = 4).
In general, each decomposition method has its own underlying assumptions, advantages and limitations.
At each decomposition site, one set of litterbags was set out (Figure 1).
A new approach based on energy scale coefficient (for each decomposition level) is used for mother wavelet selection.
While increasing H2 decomposition pressure increased S BET within each decomposition time series, S BET did not increase within each decomposition pressure series, particularly from 5 to 7 h.
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Update-first means the approximate coefficients will be obtained firstly during each decomposition-level, and then the approximate coefficients of next decomposition-level will be obtained using the approximate coefficients of the current decomposition level.
Moreover, the best PSNR performances by wavelet subbands for each wavelet decomposition are shown in Table 4.
At each wavelet decomposition level, the squared value of the detail information is calculated as their energy to construct the feature vector for analysis.
A visual mask based on bilateral filtering is used for the embedding region selection while the watermark intensity in each wavelet decomposition subband is modulated according to a contrast sensitivity function.
For each wavelet decomposition level and frequency orientation, the weights are directly obtained from the CSF curve, by normalizing the corresponding values so that the most perceptually important frequencies are scaled with higher values, while the less important are preserved.
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