Abstract
This talk will address the problem of determining the semi-rigid motion of an ice floe from a series of grayscale images of the floe. The analysis will start with the global properties of the images. The next step is to determine the scale and character of the relevant local properties and to identify minimal rigid regions of the image. The final step is to determine how the regions have evolved between successive images. Combinations of Euclidean invariants will be used to look for possible matching regions.