rigid2Dreg- calculates motion parameters for rigid body transformation
affine2Dreg- calculates motion parameters for affine transformation
imageWarp- warps image according to input transformation matrix
shapes- creates shape phantom with input translation, rotation and shear
Shepp-Logan- creates Shepp-Logan phantom with input translation, rotation and shear
testrigid- runs through a series of rigid motions and plots results
loadims- creates an interesting set
of images for use with testrigid (these and more have been tried!)