A quasi-principal axis frame means a unit orthogonal frame in which the shear strains are small, As an extension of Hill s principal axis method, ireestablish the approximate representations for various strains, the finite rotation tensor, spins, strain rates, conjugate stresses and their rates with respect to quasi-principal axes.

Cross-weighted moment algorithm is used to calculate the horizontal translation measure, vertical translation measure and vertical measure of two initial images which are used as the initial registration parameters.

This paper firstly presents a classification of medical image registration methods in terms of seven standards, then summarizes some major registration methods from three aspects, such as moment and principal axes method, mutual information, and correlation method etc.

From the development of medical image registration method through the world,we find that principal axes and centroid based method has many good points to coarse match in combine registration method.