Method of Reducing Visibility of Pulsed Illumination While Acquiring High Quality Imagery

摘要

A method of providing active illumination during biometry that utilizes pulsed lighting synchronized to frame acquisition. Two distinct illumination modalities are provided: the first maximizes the quality of images captured by the imaging system, and the second minimizes the overall illumination perceived by the user in combination with the first. The two modalities are provided substantially simultaneously. The first modality always includes a set of pulses synchronized with frame acquisition. The second modality may be either a second set of pulses not synchronized with frame acquisition or constant background illumination. The two modalities may be generated by two separate sources of illumination or by the same single illumination source. Adding the second modality to the first reduces user discomfort and the chances of an epileptic response as compared to using the first modality alone. The two modalities may have different wavelengths, pulse durations, or intensities.

主权项

1. A method of providing active illumination during biometry that utilizes pulsed lighting synchronized to imaging system frame acquisition, comprising the steps of:
a) providing a first illumination modality that maximizes the quality of images captured by the imaging system; and b) providing a second illumination modality, substantially simultaneously as the first illumination modality, that, in combination with the first illumination modality, minimizes the overall illumination perceived by the user.