49. A method according to claim 48, further comprising a confidence level determining step determining step for determining confidence level of said plural candidates based on the distance values provided by the different distance functions.
49. A method according to claim 48, further comprising a confidence level determining step determining step for determining confidence level of said plural candidates based on the distance values provided by the different distance functions. 51. A method according to claim 49, wherein said confidence level determining step determines the confidence level based on a comparison of the distance values returned by the different distance functions.