These moments include normalized central moments, hu's moment invariants, affine moment invariants, and tsirikolias-mertzios moments . the classification techniques used here are euclidean distance measure, normalized cross correlation and discrimination cost 这些矩包括规格化后的中心矩、hu矩不变量、仿射矩不变量和tsirikolias-的北丁业人学6卜学位论义搁要mertzios矩。