# US 10,441,199 B2 · Method, apparatus and system for measuring finger moisture

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,441,199 B2
- Document ID: US10441199B2
- Status: Granted
- Kind: B2
- Application number: 15/784,037
- Filed: 2017-10-13
- Published: 2018-12-13
- Granted: 2019-10-15
- Earliest claimed: 2017-06-12
- Assignees: Shenzhen Goodix Technology Co., Ltd.
- Applicants: Shenzhen Goodix Technology Co., Ltd.
- Inventors: Yanzhao Li
- Web page: https://patentgrep.com/patent/US10441199B2

## CPC

- A61B 5/1172: using fingerprinting
- A61B 5/4875: {Hydration status, fluid retention of the body}
- G06F 18/22: Matching criteria, e.g. proximity measures
- G06V 40/13: Sensors therefor
- G06V 40/1359: {Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop}
- G06V 40/1365: {Matching; Classification}
- A61B 5/4266: {sweat secretion}
- A61B 2576/00: Medical imaging apparatus involving image processing or analysis (A61B1/00009, A61B6/52 and A61B8/52 take precedence)
- G01L 13/00: Devices or apparatus for measuring differences of two or more fluid pressure values
- G16H 30/40: for processing medical images, e.g. editing
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)
- G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 6)

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.

### Claim 8 (depends on 6)

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.

### Claim 9 (depends on 8)

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.

### Claim 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.

### Claim 11 (depends on 10)

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.

### Claim 12 (depends on 10)

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.

### Claim 13 (depends on 12)

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 between the fingerprint signal intensity and the image background intensity, determine a ratio of the difference value to the image background intensity to be the fingerprint signal change rate.

### Claim 14 (depends on 10)

The apparatus according to claim 10, wherein the processor is further configured to:
obtain a maximum signal intensity and a minimum signal intensity of pixels within a desired region in the fingerprint image;
determine the fingerprint signal intensity according to the maximum signal intensity and the minimum signal intensity.

### Claim 15 (depends on 14)

The apparatus according to claim 14, wherein the processor is further configured to:
obtain the desired region in the fingerprint image;
calculate signal intensities of all pixels in the desired region;
determine the maximum signal intensity and the minimum signal intensity among the signal intensities.

### Claim 16 (depends on 14)

The apparatus according to claim 14, wherein the processor is further configured to:
obtain a neighborhood corresponding to each pixel in the fingerprint image;
calculate a maximum signal intensity and a minimum signal intensity of pixels in the neighborhood for each pixel, and obtain the maximum signal intensity and the minimum signal intensity corresponding to the each pixel;
obtain the desired region in the fingerprint image;
determine 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; determine 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.

### Claim 17 (depends on 16)

The apparatus according to claim 16, wherein the processor is further configured to:
determine a difference value between the maximum signal intensity and the minimum signal intensity to be the fingerprint signal intensity; or
obtain a signal intensity difference value between the maximum signal intensity and the minimum signal intensity corresponding to each pixel;
average out a sum of signal intensity difference values of all pixels in the desired region over in the desired region to obtain a signal intensity mean value;
determine the signal intensity mean value to be the fingerprint signal intensity.

### Claim 18

A system for measuring finger moisture, comprising: an optical imaging collector, a processor communicatively connected with the optical imaging collector and a memory;
the optical imaging collector is configured to: collect a fingerprint image, and send the collected fingerprint image to the processor;
the processor is configured to: obtain the 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, determine a health condition of each user according to data of the finger moisture before the data of the finger moisture of the user is stored in a predefined database; the memory is configured to: store the data of the finger moisture in the predefined database.