Vortex metrology using circular and elliptical Laguerre Gauss kernels

Abstract

We propose a generalization of the Laguerre Gauss Transform to include elliptical kernels in vortices metrology. To that end, we broaden the original pseudo field obtained using Laguerre Gauss Transform (LGT) that usually includes circularly a symmetric Gaussian core to include two parameters, the widths of the Gaussian filter in two perpendicular directions, thus generating a family of slightly elliptical kernels. This permits the generation of a family of very close vortices that improves the identification of homologous ones and the precision and locality of the measurements. We show examples with laser generated speckle and in ultrasound images.