A method and apparatus for qualifying an object. Several characteristic values of the object are determined and arranged in a sequence in a polar coordinate system having an origin. At least one quality point is determined as the center of gravity on the basis of the positions of the characteristic values in the polar coordinate system. The object is qualified according to the position of the quality point in the polar coordinate system. In determining the quality point, the characteristic values are taken into account by weighting with their distances from the origin of the polar coordinate system.