Active contour models have been widely used in image segmentation, and the level set method (LSM) is most popular approach for solving models, via implicitly representing by a function. However, LSM suffers from high computational burden numerical instability, requiring additional regularization terms or re-initialization techniques. In this paper, we use characteristic functions to represent c...

We present a method for the direct measurement of Wigner characteristic function thermalizing harmonic oscillator that is completely inaccessible control or measurement. The strategy employs recently proposed probe-measurement-based scheme [Phys. Rev. Lett. 122, 110406 (2019)] which relies on pulsed two-level probe. generalize this to case nonunitary time evolution target oscillator, describing...