Hash function generating method, hash value generating method, hash function generating apparatus, hash value generating apparatus, hash function generating program, hash value generating program

摘要

PROBLEM TO BE SOLVED: To generate a hash function and a hash value with high accuracy despite high speed and memory saving.SOLUTION: A hash function generation method comprises: a step for extracting feature quantity which represents content data by D (D0) dimension real-valued vector; a step which calculates relative geometric relation in the vicinity of the feature quantity by media kind; and a step which determines parameters to represent the hash function on the basis of a relationship indicator and relative geometric relation representing relationship between contents of a plurality of content data for various kinds of media so as to generate the hash function. A hash value generation method comprises: a step for extracting feature quantity which represents content data by D (D0) dimension real-valued vector; and a step which converts the feature quantity into one or more binary values by use of one or more hash functions generated by the hash function generation method.