Document capture device with variable focus, document verification system, method for optically capturing a document, method for verifying a document

DE102024115693B4Undetermined Publication Date: 2026-06-25BUNDESDRUCKEREI GMBH
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
BUNDESDRUCKEREI GMBH
Filing Date
2024-06-05
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Document capture devices struggle to achieve optimal focus for both infrared and visible light wavelengths, resulting in reduced image sharpness due to the physical limitations of achromatic and apochromatic lenses, which are unable to accommodate a fourth wavelength range effectively.

Method used

A document capture device with adjustable optics and lighting capable of illuminating and capturing images in multiple wavelength ranges, including infrared and visible light, using a camera with an image sensor and a lighting device, controlled by an electronic system to optimize focus and illumination for each range, allowing for high-sharpness images.

Benefits of technology

The device captures documents with exceptional image sharpness under different lighting conditions, enabling reliable authentication features detection and simplifying the verification process through automated image capture and analysis.

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Abstract

Document capture device (100) for optically capturing a document, comprising: - a camera, wherein the camera (110) has an image sensor (112) and optics (114), wherein the optics (114) has an adjustable focus, - an illumination means (120), wherein the illumination means (120) is configured for illumination with at least two different wavelength ranges, - a document holder (130), - an electronic control (140), wherein the electronic control (140) is configured to control the optics (114) of the camera (110) and the illumination means (120) at least for a first optical capture with illumination in a first wavelength range and a first focus, and for a second optical capture with illumination in a second wavelength range and a second focus.
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