| 摘要 |
<p>The invention relates to a method for detecting (200) a real face, comprising: - a step for capturing (202) a parallel image of the face captured by the camera having a polarizing filter parallel to a polarization direction and an orthogonal image of the face captured by the camera having a polarizing filter orthogonally to the polarization direction, - a step for computing a difference image resulting from the difference between the parallel image and the orthogonal image, - a step for generating a filtered image by filtering the difference image by wavelet packets on 5 levels, eliminating the low resolution levels, 1 and 5, - a step for dividing the filtered image into three filtered sub-images (forehead, nose, cheeks), - a processing step where the filtered image and each filtered sub-image undergo: o a Fourier transform or a discrete cosine transform, and o modelling during which the decrease profile of the frequencies is modelled in the form of a power-type model (a.x^b+c), - a step for extracting texture characteristics relative to the specularities of the surface of the face from the filtered image and each filtered sub-image, - a step for analysing, for each area of the face, the coefficient 'b' thus calculated and texture characteristics thus extracted relative to the truth model corresponding to said zone of the face, and - a decision making step (216) relative to the authenticity of the face from the result of the analysis step (214).</p> |
