Image acquisition device
AssigneeIsorg
InventorsJérôme Michallon, Delphine Descloux, Benjamin Bouthinon
Life of this patent
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Abstract
An image acquisition device includes a single sensor having organic photodetectors, an angular filter, and a color filter. The color filter has one or a plurality of first portions adapted to give way to at least one wavelength in the visible range, and one or a plurality of second portions filtering wavelengths outside of red and/or near infrared. The second portion has a surface area approximately equal to a surface area of one of the photodetectors or a surface area greater than or equal to the surface area of four of the photodetectors.
Claims14
A method for detecting a real or fake finger by an image acquisition device, comprising the steps of:
- a) acquiring an image of the finger at a given wavelength;
- b) determining a response signal from said image;
- and
- c) comparing the determined response signal with a reference value according to a comparison criterion and determining that the finger is a fake finger if the comparison criterion is not respected,
- wherein steps a), b), and c) are repeated for at least two different wavelengths,
- wherein the comparison criterion comprises determining whether the determined response signal corresponds to the reference value, to within a threshold, the threshold corresponding to a difference between the reference value and a grey level value at half-maximum of a reference distribution.
Dependencies are inferred from the claim text.