Biometric template similarity based on feature locations

A computer program, embodied in a computer readable storage device for determining correspondence between location sets, comprising:

• transforming a first location set comprising a number of components into a density function by summing averaging functions shifted to locations indicated by selected components in the first location set;
• and
• determining a distance between the density function and another density function that corresponds to a second location set comprising a number of components, wherein correspondence exists between the first and the second location set if said distance complies with a predetermined distance value;
• wherein the summing of averaging functions shifted to locations indicated by selected components in the first location set is effected by the transforming means by performing a convolution of the averaging function with a sum of Dirac pulses at locations indicated by the selected components in the first location set.

A system for determining correspondence between location sets, the system comprising:

• means for transforming a first location set comprising a number of components into a density function by summing averaging functions shifted to locations indicated by selected components in the first location set;
• and
• means for determining a distance between the density function and another density function that corresponds to a second location set comprising a number of components, wherein correspondence exists between the first and the second location set if said distance complies with a predetermined distance value;
• wherein the summing of averaging functions shifted to locations indicated by selected components in the first location set is effected by the transforming means by performing a convolution of the averaging function with a sum of Dirac pulses at locations indicated by the selected components in the first location set.