FN ISI Export Format VR 1.0 PT J TI Analysis of ice crystal orientation from polarization microscopy images using machine vision AF Rohner, Manuel AU Rohner, M AB Crystallography deals with the characterisation of crystals, which are solids with fix arranged atoms in a crystal lattice. Some crystals are polycrystalline and consist of individual grains. The orientation of the ice crystal grains can be characterized by their main axis of symmetry, which is called c-axis. Many physical properties depend on the orientation of the c-axis, for example the mechanical behaviour of ice. It is therefore important to experimentally characterize the c-axis orientation in snow and ice. The SLF builds a computer integrated polarisation microscopy setup (CIP) which can analyse snow and ice in thin section samples. The physical principle behind CIP is the birefringence of the analysed crystals. In a crossed polariser setup, depending on the c-axis orientation, the crystal causes a rotation of the polarisation state and therefore an intensity change. The aim of the thesis is to implement a CIP software to determine the c-axis orientation from thin section samples. ER