17. The biometric authentication system of claim 1 : wherein the biometric verification system is configured to access the particular biometric image of at least the portion of the particular person by accessing multiple biometric images of the particular person, each of the multiple biometric images corresponding to a different portion of the particular person; wherein the biometric verification system is configured to access the reference image by 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 the biometric verification system is configured to compute the particular similarity score that represents similarity between the accessed particular biometric image and the reference image by: 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 the biometric verification system is configured to search the sorted similarity scores included in the biometric data using the computed particular similarity score by searching the sorted similarity scores included in the biometric data using the fused similarity score.
18. The biometric authentication system of claim 17 , wherein the biometric verification system is configured to compute the fused similarity score based on the multiple similarity scores by taking a weighted average of the multiple similarity scores.