Exact(12)
For the low frequency subband, it contains low frequency information.
In Methods 4 and 5, LSWT is used as the MST method, and the 'IEOL-max' fusion rule is employed to merge the low frequency subband coefficients.
The following study presented in this article is concerned with a design of novel fusion rules for the low frequency subband coefficients and the high frequency subband coefficients.
To improve the fused image quality, a clarity measure should be defined to determine whether a coefficient of the low frequency subband is in focus or out of focus.
In order to improve the robustness of the contrast to the noise of the low frequency subband, the feature contrast can be modified as S d, l ( x, y ) = IS L d, l ( x, y ) f ̄ l ( x, y ) (21).
In practice, to reduce the computation complexity and the influence of low frequency subband noise, f l (x, y) can be substituted with the coarsest lowpass subband image f L (x, y).
Similar(48)
There are more spectral bins in high-frequency subbands than those in low frequency subbands.
Here, T λ,θ is the perceptual weight which is determined by basis function amplitudes and CSF masking in order to avoid adding too much energy in the low frequency subbands.
where c(i) is the i th coefficient in the lowest frequency subband.
2) Consider the additive noise corruption, the watermark is inserted into the lowest frequency subband of DWT domain.
Consider the additive noise corruption, the watermark is inserted into the lowest frequency subband of DWT domain.
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