Front cover: Cover image: See J. Jia et al., 'Comparative osteology of the hynobiid complex Liua-Protohynobius-Pseudohynobius (Amphibia, Urodela): I. Cranial anatomy Pseudohynobius’, this issue.

In medical imaging, a important task is the detection of a lesion or defect in a noisy background. For signal-known-exactly (SKE) detection tasks, a figure of merit (FOM), the area under the receiver operating characteristic (ROC) curve (AROC), can be used to evaluate the task performances and to compare the data processing methods. The objective of the SKE task is to determine whether the imag...

In the presented paper a new approach to the problem of noise reduction of gray and colour images has been presented. The new method is based on the concept of a virtual particle performing a random walk on the image lattice, with transition probabilities defined by the median distribution. The major advantage of this algorithm, is that it filters the image, while preserving the image structure...

We show that the Fourier transform on the Jacobian of a curve interchanges " δ functions " on the curve and the theta divisor. The Torelli theorem is an immediate consequence. 1. Statement of the theorem. 1.1. We live over an algebraically closed base field k. Let J be an abelian variety equipped with a principal polarization θ : J ∼ → J • = Pic 0 (J), so we have the corresponding Fourier trans...