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similarite.py
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similarite.py
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# -*- coding: utf-8 -*-
###############################################
#created by : lxy
#Time: 2018/10/16 10:09
#project: Face recognize
#rversion: 0.1
#tool: python 2.7
#modified:
#description papers:
####################################################
import numpy as np
def set_threshold(score):
'''
input: the range of score is [0,100]
output:distance_threshold, confidence_threshold,
'''
confidence_base = 0.04
distance_base = 1.6
mult_bin = 0.003
global confidence_threshold, distance_threshold
if score > 90:
confidence_threshold = mult_bin * score
else:
confidence_threshold = confidence_base + score/100
distance_threshold = distance_base - score/100
return confidence_threshold, distance_threshold
def similarity_score(confidence):
'''
input: confidence distance
output: similarity score
'''
confidence_max = 0.4
if confidence >= confidence_threshold:
score = np.exp(confidence) / np.exp(confidence_max) * 100
else:
score = (np.exp(confidence) -1) / np.exp(confidence_max) * 100
return score