35. The method of claim 19 : wherein accessing the particular biometric image of at least the portion of the particular person comprises accessing multiple biometric images of the particular person, each of the multiple biometric images corresponding to a different portion of the particular person; wherein accessing the reference image comprises accessing multiple reference images, each of the multiple reference images corresponding to a different portion of a person and mapping to one of the multiple biometric images; wherein computing the particular similarity score that represents similarity between the accessed particular biometric image and the reference image comprises: computing multiple similarity scores, each of the multiple similarity scores representing similarity between one of the multiple biometric images and one of the multiple reference images; and computing a fused similarity score based on the multiple similarity scores; and wherein searching the sorted similarity scores included in the biometric data using the computed particular similarity score comprises searching the sorted similarity scores included in the biometric data using the flised similarity score.
19. A method comprising: determining, by a biometric enrollment system and for each person in a group of multiple, different people, a similarity score that represents a similarity between a biometric image of at least a portion of the corresponding person from the group of multiple, different people and a reference image, wherein the reference image is used in determining all of the similarity scores for the group of multiple, different people; sorting biometric data that includes all of the determined similarity scores using the determined similarity scores; maintaining, in electronic storage and for the group of multiple, different people, the biometric data that includes all of the sorted similarity scores; accessing a particular biometric image of at least a portion of a particular person; accessing the reference image used in computing all of the similarity scores maintained in the electronic storage; computing a particular similarity score that represents similarity between the accessed particular biometric image and the reference image; searching, by a biometric authentication system that includes at least one processor and using the computed particular similarity score, the sorted similarity scores included in the biometric data for the group of multiple, different people; and outputting a result based on determination of whether the electronic storage includes data for the particular person in the biometric data.