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Method and system for estimating finger movement

A technique for moving direction, fingers, used in the field of estimating finger movement and systems

Active Publication Date: 2017-08-29
FINGERPRINT CARDS ANACATUM IP AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, there is still room for improvement in terms of using fingerprint sensors to estimate finger movement, especially how to achieve sufficient accuracy when using small fingerprint sensors and tracking methods with low memory requirements and low computational complexity

Method used

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  • Method and system for estimating finger movement
  • Method and system for estimating finger movement
  • Method and system for estimating finger movement

Examples

Experimental program
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Embodiment Construction

[0065] figure 1 An example application of the finger navigation system according to an embodiment of the invention is schematically shown in the form of a remote control device 1 for controlling the operation of a television set 2 . It should be noted that the remote control device 1 is only an example application, and the finger navigation system according to the embodiment of the present invention can also be incorporated in other electronic devices, such as mobile phones or computers, etc., as long as the user's finger moves The fingerprint sensor can be used to control the operation of the electronic device.

[0066] refer to figure 1 , the remote control device 1 includes a finger navigation system 4 and a wireless transmitter, for example, an infrared LED ( figure 1 not shown). The television set 2 includes a wireless receiver, such as a photodetector (not shown), for receiving the signal transmitted by the remote control device 1 . For example, the TV set 2 can be c...

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Abstract

The present invention relates to a method of estimating a finger movement direction of a finger, comprising the steps of: a) acquiring a reference fingerprint image; b) acquiring at least one candidate fingerprint image at each acquisition time in a time sequence of acquisition times; c) determining, for each of the acquisition times, a match parameter value for each of a plurality of candidate finger movement directions, the match parameter value being indicative of a correlation between a reference fingerprint image portion and a candidate fingerprint image portion corresponding to displacement in the candidate finger movement direction; d) determining, for each of the candidate finger movement directions, a local extremum match parameter value indicating a maximum correlation for the time sequence of acquisition times; and e) estimating the finger movement based on an evaluation of the determined local extremum match parameters.

Description

technical field [0001] The present invention relates to a method and system for estimating finger movement using a fingerprint sensor. Background technique [0002] Fingerprint sensors are sometimes used as "navigation tools", for example, to move a cursor or pointer on a display or to select items presented on the display, etc. [0003] To be able to use the fingerprint sensor in this navigation tool application, it is necessary to somehow track the movement of the user's finger across the fingerprint sensor. [0004] According to a method described in US 6 408 087, the ridges and pores of a fingerprint are identified and the movement of the ridges and pores between successive images of the fingerprint is detected. [0005] In order to manufacture the hardware of fingerprint-based navigation tools in a cost-effective and power-efficient manner, it is desirable to reduce the size of the fingerprint sensor as much as possible and to use methods with low memory requirements a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/033G06K9/00G06V40/12
CPCG06F3/0383G06F2203/0338G06F3/03547G06V40/12G06V40/1365G06V40/1335
Inventor 汉斯·特恩布卢姆埃里克·塞特贝里
Owner FINGERPRINT CARDS ANACATUM IP AB
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