A quasi-Euclidean norm to speed up vector median filtering.

For reducing impulsive noise without degrading image contours, median filtering is a powerful tool. In multiband images, as for example color images or vector fields obtained by optic flow computation, a vector median filter can be used. Vector median filters are defined on the basis of a suitable distance, the best performing distance being the Euclidean. Euclidean distance is evaluated by using the Euclidean norm which is quite demanding from the point of view of computation given that a square root is required. In this paper an optimal piece-wise linear approximation of the Euclidean norm is presented which is applied to vector median filtering.

[Modification of the pharmacokinetics of some antibiotics by oral administration with an L-(-)verbenone beta-cyclodextrin complex]. / Modifiche della farmacocinetica di alcuni antibiotici dopo somministrazione orale del complesso L(-) Verbenone/betaciclodestrina.

With the aim to evaluate the effect of L (-) Verbenone on the pharmacokinetic of some antibiotics, a compound has been prepared with beta cyclodextrin, allowing the administration per os. Pharmacological studies have been carried out using erythromycin and ampicillin, determining their kinetics in the hepatic and lung tissues after administration to albino mice. The results show that L (-) Verbenone modifies the distribution of the antibiotics used; it increases their concentration at lung level while the concentration at hepatic level remains unchanged.