1. An image processing method for feature retention associated with averaging a plurality of image data, said image processing method comprising: scaling and aligning a plurality of image data for acquiring feature information; determining a plurality of two-dimensional feature label points according to said feature information for generating at least one Bezier curve; utilizing said at least one Bezier curve to generate at least one Bezier tube and performing Bezier tube fitting for generating result of Bezier tube fitting; deforming, by a processor, said plurality of image data according to said Bezier tube or said result of Bezier tube fitting for generating a plurality of deformed image data; and averaging said plurality of deformed image data for generating feature-retained averaged image data.