Method for detecting a true face
US9336434B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2014 |
| Grant date | May 10, 2016 |
| Priority date | — |
| Expiry date | Jun 20, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06V40/45
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Detecting a true face includes: capturing a parallel image of a face captured by a camera having a filter polarizing parallel to a polarization direction and an orthogonal image of the face captured by a camera's filter polarizing orthogonally to the polarization direction; computing a difference image from difference between the parallel and orthogonal images; filtering the difference image in wavelet packets on 5 levels, eliminating “low” resolution levels; dividing the filtered image into sub-images; the filtered image and each sub-image undergoes: a Fourier or discreet cosine transformation; and modelling during which the frequency decrease profile is modelled by a model of the power type (a.x^b+c); extracting, from the filtered image and each sub-image, texture characteristics of face surface specularities; analyzing, for each face region, coefficient “b” and the texture characteristics extracted regarding the model corresponding to said face region; and deciding the veracity of the face from the analysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.