1. An object processing method comprising: adapting a universal mixture model including a plurality of universal mixture model components to a first object to generate a first object mixture model including a plurality of first object mixture model components having one-to-one correspondence with the plurality of universal mixture model components; performing component-by-component comparison of the plurality of first object mixture model components and a plurality of second object mixture model components obtained by adaptation of the universal mixture model to a second object and having one-to-one correspondence with the plurality of first object mixture model components; and generating a similarity measure for the first and second objects based on the component-by-component comparison; wherein the adapting, performing, and generating operations are performed by a processing device.