SYSTEM AND METHOD BASED ON HYBRID BIOMETRIC DETECTION

摘要

A system and method based on hybrid biometric detection capture first images of a user that is projected by first light of different wavelengths, extract various biometric informations from the first images, analyze and compare for each of the biometric informations to generate a matching score, determine an identity for the user according to all of the matching scores, generate second images and PPG signals from dispensed second light from the user, generate a time and PPG variation signal and a space and PPG variation signal for each frame of the second images, convert the time and PPG variation signals into frequency domain signals, determine a reference frequency according to the space and PPG variation signals, retrieve energy of the frequency domain signals at the reference frequency, and establish a three-dimensional energy distribution from the retrieved energy.

主权项

1. A system based on hybrid biometric detection, comprising:
a first light source being configured to provide light of different wavelengths under control to project on a user; a first image sensor being configured to capture images of the user to generate image signals; a recognition module being coupled to the image sensor and configured to receive the image signals, extract various biometric informations from the images, and analyze and compare for each of the biometric informations to generate a matching score; an analysis unit being coupled to the recognition module and configured to determine an identity for the user according to all of the matching scores generated by the recognition module; and a biometric detection system which comprises: a second light source being configured to emit to illuminate a skin surface of the user; a second image sensor being configured to receive dispensed light from the user for generating PPG signals; a time frequency reducing unit being coupled to the second image sensor and configured to generate a time and PPG variation signal for each frame captured by the second image sensor; a space frequency reducing unit being coupled to the second image sensor and configured to generate a space and PPG variation signal for each frame captured by the second image sensor; a converting unit being coupled to the time frequency reducing unit and the space frequency reducing unit, and configured to convert the time and PPG variation signals into frequency domain signals and determine a reference frequency according to the space and PPG variation signals; a capturing unit being coupled to the converting unit and configured to retrieve energy of the frequency domain signals at the reference frequency; and a processing unit being coupled to the capturing unit and configured to establish a three-dimensional energy distribution.