Method, apparatus and system for measuring finger moisture

Patent metadata

Field	Value
Publication number	US-10441199-B2
Application number	US-201715784037-A
Country	US
Kind code	B2
Filing date	Oct 13, 2017
Priority date	Jun 12, 2017
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

The application discloses a method, an apparatus and a system for measuring finger moisture. The method includes: obtaining a fingerprint image; obtain a signal intensity and an image background intensity according to the fingerprint image; and determining finger moisture according to the fingerprint signal intensity and the image background intensity. In the method, apparatus and system for measuring finger moisture provided by the present invention, the fingerprint image is obtained and the fingerprint signal intensity and the image background intensity are obtained based on the fingerprint image, and the finger moisture is determined by analyzing the fingerprint signal intensity and the image background intensity, thereby effectively overcoming the defects in prior art in comparing and analyzing of images, including being prone to be disturbed by undulation of the image background, noise, etc., and low accuracy, thus ensuring the accuracy and reliability of the measurement of the finger moisture.

First claim

What is claimed is:

1. A method for measuring finger moisture, comprising:
obtaining a fingerprint image;
obtaining a fingerprint signal intensity and an image background intensity according to the fingerprint image;
determining the finger moisture according to the fingerprint signal intensity and the image background intensity identifying a user according to the fingerprint image; if the user is successfully identified, storing data of the finger moisture in a predefined database and determining a health condition of each user according to the data of the finger moisture of the user stored in the predefined database.

2. The method according to claim 1 , wherein the obtaining the fingerprint signal intensity according to the fingerprint image comprises:
obtaining a mean value of ridge signal intensities corresponding to ridges of a finger in the fingerprint image, and a mean value of valley signal intensities corresponding to valleys thereof;
determining a difference value between the mean value of the ridge signal intensities and the mean value of the valley signal intensities to be the fingerprint signal intensity.

3. The method according to claim 1 , further comprising:
obtaining information of a pressure applied by a finger while obtaining the fingerprint image;
if the information of the pressure is greater than or equal to a predefined pressure threshold, obtaining the fingerprint signal intensity and the image background intensity according to the fingerprint image; or
if the information of the pressure is smaller than the predefined pressure threshold, stopping obtaining the fingerprint signal intensity and the image background intensity.

4. The method according to claim 1 , wherein the determining the finger moisture according to the fingerprint signal intensity and the image background intensity comprises:
obtaining a fingerprint signal change rate according to the fingerprint signal intensity and the image background intensity;
if the fingerprint signal change rate is greater than or equal to a predefined first change rate threshold, determining that the finger moisture is overly wet; or
if the fingerprint signal change rate is less than the predefined first change rate threshold and greater than or equal to a predefined second change rate threshold, determining that the finger moisture is moderate; or
if the fingerprint signal change rate is less than the predefined second change rate threshold, determining that the finger moisture is overly dry.

5. The method according to claim 4 , wherein the obtaining the fingerprint signal change rate according to the fingerprint signal intensity and the image background intensity comprises:
determining a ratio of the fingerprint signal intensity to the image background intensity to be the fingerprint signal change rate; or
obtaining a difference value between the fingerprint signal intensity and the image background intensity, and determining a ratio of the difference value to the image background intensity to be the fingerprint signal change rate.

6. The method according to claim 1 , wherein the obtaining the fingerprint signal intensity according to the fingerprint image comprises:
obtaining a maximum signal intensity and a minimum signal intensity of pixels within a desired region in the fingerprint image;
determining the fingerprint signal intensity according to the maximum signal intensity and the minimum signal intensity.

7. The method according to claim 6 , wherein the obtaining the maximum signal intensity and the minimum signal intensity of pixels within the desired region in the fingerprint image comprises:
obtaining the desired region in the fingerprint image;
calculating signal intensities of all pixels in the desired region;
determining the maximum signal intensity and the minimum signal intensity among the signal intensities.

8. The method according to claim 6 , wherein the obtaining the maximum signal intensity and the minimum signal intensity of pixels within the desired region in the fingerprint image comprises:
obtaining a neighborhood corresponding to each pixel in the fingerprint image;
calculating a maximum signal intensity and a minimum signal intensity of pixels in the neighborhood for each pixel, and obtaining the maximum signal intensity and the minimum signal intensity corresponding to the each pixel;
obtaining the desired region in the fingerprint image;
determining a maximum value among maximum signal intensities corresponding to all pixels in the desired region to be the maximum signal intensity of the pixels in the desired region; determining a minimum value among minimum signal intensities corresponding to all the pixels in the desired region to be the minimum signal intensity of the pixels in the desired region.

9. The method according to claim 8 , wherein the determining the fingerprint signal intensity according to the maximum signal intensity and the minimum signal intensity comprises:
determining a difference value between the maximum signal intensity and the minimum signal intensity to be the fingerprint signal intensity; or
obtaining a signal intensity difference value between the maximum signal intensity and the minimum signal intensity corresponding to each pixel; averaging out a sum of signal intensity difference values of all pixels in the desired region in the desired region to obtain a signal intensity mean value; determining the signal intensity mean value to be the fingerprint signal intensity.

10. An apparatus for measuring finger moisture, comprising a processor and a memory storing instructions thereon, the processor when executing the instructions, being configured to:
obtain a fingerprint image;
obtain a fingerprint signal intensity and an image background intensity according to the fingerprint image,
determine the finger moisture according to the fingerprint signal intensity and the image background intensity, identify a user according to the fingerprint image; if the user is successfully identified, store data of the finger moisture in a predefined database and determine a health condition of each user according to the data of the finger moisture of the user stored in the predefined database.

11. The apparatus according to claim 10 , wherein the processor is further configured to:
obtain a mean value of ridge signal intensities corresponding to ridges of a finger in the fingerprint image, and a mean value of valley signal intensities corresponding to valleys thereof;
determine a difference value between the mean value of the ridge signal intensities and the mean value of the valley signal intensities to be the fingerprint signal intensity.

12. The apparatus according to claim 10 , wherein the processor is further configured to:
obtain a fingerprint signal change rate according to the fingerprint signal intensity and the image background intensity;
if the fingerprint signal change rate is greater than or equal to a predefined first change rate threshold, determine that the finger moisture is overly wet; or
if the fingerprint signal change rate is less than the predefined first change rate threshold and greater than or equal to a predefined second change rate threshold, determine that the finger moisture is moderate; or
if the fingerprint signal change rate is less than the predefined second change rate threshold, determine that the finger moisture is overly dry.

13. The apparatus according to claim 12 , wherein the processor is further configured to:
determine a ratio of the fingerprint signal intensity to the image background intensity to be the fingerprint signal change rate; or
obtain a difference value

Assignees

• Shenzhen Goodix Tech Co Ltd

Inventors

• Li Yanzhao

Classifications

• G16H30/40

  for processing medical images, e.g. editing · CPC title

• A61B5/4266

  sweat secretion · CPC title

• A61B2576/00

  Medical imaging apparatus involving image processing or analysis (A61B1/00009, A61B6/52 and A61B8/52 take precedence) · CPC title

• G06F18/22

  Matching criteria, e.g. proximity measures · CPC title

• G06V40/13 Primary

  Sensors therefor · CPC title