Granted Patent B2

US 7,706,581 · App. 10/571,157 · Granted Apr 27, 2010

Abstract

Claims (44)

1. A method of detecting skinprints, in particular fingerprints, characterized in that

at least one strip sensor comprising at least one elongate narrow sensor line detects the structure of the fingertip when the fingertip passes over the strip sensor,

at least one optoelectronic speed sensor continuously determines finger movement,

the fingertip is moved over at least one optoelectronic speed sensor and the strip sensor, and

the determined finger movement is used to correct an image of the finger structure that has been distorted as a result of non-uniform movement, wherein a movement sequence takes place such that the same regions of the fingertip pass over the strip sensor a number of times and are detected as images, and the image information detected a number of times for one region is taken into account for image improvement purposes, at least part of the spatial allocation of the image information taking place through the detected movement sequence.

2. A method as claimed in claim 1 , characterized in that the finger movement is carried out by a user with a characteristic sequence of movements, and in that the determined finger movement is compared with a stored finger movement.

3. A method as claimed in claim 2 , characterized in that the stored finger movement is typical for the user and the user is thus identified.

4. A method as claimed in claim 2 , characterized in that a detecting unit is switched into various operating states by different results during the detection of the finger movement.

5. A method of detecting skinprints, in particular fingerprints, characterized in that

at least one strip sensor comprising at least one elongate narrow sensor line detects the structure of the fingertip when the fingertip passes over the strip sensor,

at least one optoelectronic speed sensor continuously determines finger movement,

the fingertip is moved over at least one optoelectronic speed sensor and the strip sensor, and

the determined finger movement is used to correct an image of the finger structure that has been distorted as a result of non-uniform movement, wherein the determined finger movement is used to determine, via at least one of calculation and selection, the coefficients of non-symmetrical, orientation-selective spatial filters, and wherein the spatial filters are used to perform corrections of the movement directions during processing of the image.

6. A method of detecting skinprints, in particular fingerprints, characterized in that

at least one strip sensor comprising at least one elongate narrow sensor line detects the structure of the fingertip when the fingertip passes over the strip sensor,

at least one optoelectronic speed sensor continuously determines finger movement,

the fingertip is moved over at least one optoelectronic speed sensor and the strip sensor, and

the determined finger movement is used to correct an image of the finger structure that has been distorted as a result of non-uniform movement, wherein the determined finger movement is used to determine, via at least one of calculation and selection, the coefficients of spatial filters, and wherein the spatial filters are used to perform corrections of the different movement distances during processing of the finger image.

7. A method of detecting skinprints, in particular fingerprints, characterized in that

at least one strip sensor comprising at least one elongate narrow sensor line detects the structure of the fingertip when the fingertip passes over the strip sensor,

at least one optoelectronic speed sensor continuously determines finger movement,

the fingertip is moved over at least one optoelectronic speed sensor and the strip sensor, and

the determined finger movement is used to correct an image of the finger structure that has been distorted as a result of non-uniform movement, wherein finger movement is determined simultaneously on various part-surfaces of the fingertip, and wherein a proportional rotary movement in that plane of image recording is calculated therefrom.

8. A method of detecting skinprints, in particular fingerprints, characterized in that

at least one strip sensor comprising at least one elongate narrow sensor line detects the structure of the fingertip when the fingertip passes over the strip sensor,

at least one optoelectronic speed sensor continuously determines finger movement,

the fingertip is moved over at least one optoelectronic speed sensor and the strip sensor, and

the determined finger movement is used to correct an image of the finger structure that has been distorted as a result of non-uniform movement, wherein-movement information from various part-surfaces of the fingertip is determined simultaneously and taken into account separately for the part-surfaces.

9. A method of detecting skinprints, in particular fingerprints, characterized in that

at least one strip sensor comprising at least one elongate narrow sensor line detects the structure of the fingertip when the fingertip passes over the strip sensor,

at least one optoelectronic speed sensor continuously determines finger movement,

the fingertip is moved over at least one optoelectronic speed sensor and the strip sensor, and

the determined finger movement is used to correct an image of the finger structure that has been distorted as a result of non-uniform movement, wherein the finger movement of various part-surfaces of the fingertip is determined simultaneously and an excessively highly pronounced deformation and/or a measurement error is identified when the determined finger movements of the part-surfaces differ considerably from those which would be possible as a result of a rotation and/or displacement with plausible parameters.

10. A method of detecting skinprints, in particular fingerprints, characterized in that

at least one strip sensor comprising at least one elongate narrow sensor line detects the structure of the fingertip when the fingertip passes over the strip sensor,

at least one optoelectronic speed sensor continuously determines finger movement,

the fingertip is moved over at least one optoelectronic speed sensor and the strip sensor, and

the determined finger movement is used to correct an image of the finger structure that has been distorted as a result of non-uniform movement, wherein the correction of the image by means of the determined finger movement comprises the following part-calculations: conversion of the positions of the image points from a representation that is not necessarily equidistant on account of non-uniform movement to a spatially highly resolved representation and in accordance with spatial filtering with low-pass effect, and conversion into a representation that is reduced again but reliably equidistant.

11. A method of detecting skinprints, in particular fingerprints, characterized in that

at least one strip sensor comprising at least one elongate narrow sensor line detects the structure of the fingertip when the fingertip passes over the strip sensor,

at least one optoelectronic speed sensor continuously determines finger movement,

the fingertip is moved over at least one optoelectronic speed sensor and the strip sensor, and

the determined finger movement is used to correct an image of the finger structure that has been distorted as a result of non-uniform movement, wherein laser light emitted by the speed sensor and reflected is used to determine chemical properties from the color line spectrum of the light component reflected by the finger.

12. A method as claimed in claim 11 , characterized in that a determination of the concentration of dissolved and bound gases in the blood, including blood oxygen content or carbon dioxide content, is carried out.

Assignments (10)