公开(公告)号：US20240221431A1

公开(公告)日：2024-07-04

申请号：US18557026

申请日：2022-05-04

申请人： IDLOOP GMBH

发明人： Bernd REINHOLD

IPC分类号： G06V40/60 ,  G06V40/13

CPC分类号： G06V40/67 ,  G06V40/1312 ,  G06V40/1318

摘要： The invention relates to a device and method for contactless optical recording of the papillary structure of a hand or parts thereof, which are equivalent to contact-based prints.
The object of the invention is achieved by a device and method for contactless optical recording of the papillary structure of a hand, comprising:



a recess (30) in the upper area of the device (4) for fingerprint recording, which serves a user for rough orientation of the correct hand positioning (31),
a lighting unit (1) for illuminating the hand or parts thereof (3) with structured light,
a camera (2) for detecting light from the lighting unit (1), which is diffusely reflected from the hand or parts thereof (3) in an object plane (21) of the camera (2), wherein
a nonzero difference in the distances between the camera and the lighting unit from the object plane (17) is present in order to determine a position of the hand or parts thereof (3) in relation to the range (9) of depth of field of the camera (2) using a method for determining structure size in an image recorded by the camera (2), and
a computing unit (29) for position calculation by determining structure size and for calculating the fingerprint image.