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These four subbands contain diagonal details, vertical details, horizontal details, and approximation coefficients, respectively.
Avoid detail over shoulders and horizontal details.
Opt for vertical details and avoid horizontal details.
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The methods used for fixing locations within the horizontal detail framework are similar to, but less accurate than, those used for the primary framework.
(a) horizontal detail subband x 1 ( H L ) ( β 1 ( H L ) = 1.
Only horizontal detail subbands from the first level of Haar wavelet decomposition are used for the degradation measurement.
The WTM is calculated from the vertical and the horizontal detail components, and the approximation component is employed to normalize the estimation.
On the other hand, the same probability is 41.35 % when using the horizontal detail subband γ=H L and reaches 53.13 % for the vertical detail subband γ=L H. Table 5 Imperceptibility performance expressed through the HDR-VDP-2 metric (in %).
However, it can be noticed from Figure 1 that the diagonal detail signal x j + 1 ( H H ) is also used through the second and the third prediction steps to compute the vertical and the horizontal detail signals respectively.
To elaborate more, let us denote the th level wavelet coefficient of the original image as, where the subscript stands for horizontal detail coefficient, stands for vertical detail coefficient,, and are the indices of the spatial location under consideration.
Horizontal detailing at the toe will make a wide foot look wider.
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