Retrieve the heart-rate and compute performances

Frequency analysis and Heart-rate computation

The heart-rate is computed by doing an analysis of the pulse signal. The Welch’s algorithm is applied to find the power spectrum of the signal, and the heart rate is found using peak detection in the frequency range of interest. To obtain the heart-rate, you should do the following:

$ ./bin/ -v

Generating performance measures

In order to get some insights on how good the computed heart-rates match the ground truth, you should execute the following script:

$ ./bin/ -v

This will output and save various statistics (Root Mean Square Error, Pearson correlation) as well as figures (error distribution, scatter plot).

Again, these scripts rely on the use of configuration files. An minimal example is given below:

import os, sys

import bob.db.hci_tagging
import bob.db.hci_tagging.driver

if os.path.isdir(bob.db.hci_tagging.driver.DATABASE_LOCATION):
  dbdir = bob.db.hci_tagging.driver.DATABASE_LOCATION
if dbdir == '':
  print("You should provide a directory where the DB is located")
database = bob.db.hci_tagging.Database()
protocol = 'cvpr14'

basedir = 'li-hci-cvpr14/'

hrdir = basedir + 'hr'
nsegments = 16
nfft = 8192