BIOMETRIC OPTICAL ANTISPOOFING BASED ON IMAGING THROUGH SPATIALLY VARYING OPTICAL FILTER

A biometric imaging arrangement comprises an image sensor comprising a photodetector pixel array for capturing an image of an object. An infrared cut-off filter is arranged to at least partly cover the photodetector pixel array. The infrared cut-off filter comprises a first filter area having a firs...

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Bibliographic Details
Main Authors HAMMAR, Arvid, LIU, Su, MARTINSSON, Hans
Format Patent
LanguageEnglish
French
German
Published 15.05.2024
Subjects
CALCULATING
COMPUTING
COUNTING
PHYSICS
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Summary:A biometric imaging arrangement comprises an image sensor comprising a photodetector pixel array for capturing an image of an object. An infrared cut-off filter is arranged to at least partly cover the photodetector pixel array. The infrared cut-off filter comprises a first filter area having a first transmission wavelength band including wavelengths in the visible range of wavelengths, and at least two additional filter areas having transmission wavelength bands including wavelengths in the visible range of wavelengths. The transmission wavelength bands of the additional filter areas being different from the first transmission wavelength band, wherein at least two of the additional filter areas are spatially separated by the first filter area.
Bibliography:Application Number: EP20210901143