Introduction - If you have any usage issues, please Google them yourself
Performing image registration using a multi-resolution approach is widely used to improve
speed, accuracy and robustness. The basic idea is that registration is first performed at a coarse
scale where the images have fewer pixels. The spatial mapping determined at the coarse level is
then used to initialize registration at the next finer scale. This process is repeated until it reaches
the finest possible scale. This coarse-to-fine strategy greatly improve the registration success
rate and also increases robustness by eliminating local optima at coarser scales.